make/NEWS

GNU Make NEWS                                               -*-indented-text-*-
  History of user-visible changes.
  26 February 2023

See the end of this file for copyrights and conditions.

All user-visible changes are more fully described in the GNU Make manual,
which is contained in this distribution as the file doc/make.texi.
See the README file and the GNU Make manual for instructions for
reporting bugs.

* 'make --print-data-base' (or 'make -p') now outputs time of day
  using the same form as for file timestamps, e.g., "2023-05-10
  10:43:57.570558743".  Previously it used the form "Wed May 10
  10:43:57 2023", which has less detail and is harder to compare.


Version 4.4.90 (26 Feb 2023)

A complete list of bugs fixed in this version is available here:

https://sv.gnu.org/bugs/index.php?group=make&report_id=111&fix_release_id=111&set=custom

* WARNING: Removed AmigaOS support!
  This version of GNU Make no longer supports AmigaOS.  If you need support
  for AmigaOS please use one of the older versions of GNU Make.

* WARNING: Loaded Object ABI incompatibility!
  This release changes the loaded object feature from "technology preview" to
  fully-supported feature.  However, it introduces an ABI incompatibility with
  previous releases: the setup function now takes an ABI version as its first
  argument.  When compiling your loaded object you can test the GMK_ABI_VERSION 
  constant at compile time to detect which ABI should be used.  At runtime
  your initialization function can check the provided ABI version to verify
  it's being loaded correctly.

* New feature: Unload function for loaded objects
  When a loaded object needs to be unloaded by GNU Make, it will invoke an
  unload function (if one is defined) beforehand that allows the object to
  perform cleanup operations.
  Original idea and implementation: Dmitry Goncharov <dgoncharov@users.sf.net>

* New feature: Makefile warning reporting control
  A new option "--warn" controls reporting of warnings for makefiles.  Actions
  can be set to "ignore", "warn", or "error".  Two new warnings are reported:
  assigning to invalid variable names, and referencing invalid variable names
  (both set to "warn" by default), in addition to the existing warning for
  undefined variables (defaults to "ignore"). "--warn-undefined-variables" is
  deprecated, and is translated to "--warn=undefined-vars" internally.

* New feature: Control warnings with the .WARNINGS variable
  In addition to --warn from the command line, which takes effect for make
  invoked recursively, warnings can be controlled only for the current
  instance of make using the .WARNINGS variable.

* Conditional statements starting with the recipe prefix were sometimes
  interpreted in previous versions.  As per the documentation, lines starting
  with the recipe prefix are now never considered conditional statements.

* Tests in the regression test suite now are run in their own directory to
  avoid cross-contamination and allow cleanup if the tests are interrupted.
  More information is printed about failing tests.


Version 4.4.1 (26 Feb 2023)

This release is primarily a bug-fix release.
A complete list of bugs fixed in this version is available here:

https://sv.gnu.org/bugs/index.php?group=make&report_id=111&fix_release_id=110&set=custom

* WARNING: Backward-incompatibility!
  In previous releases it was not well-defined when updates to MAKEFLAGS made
  inside a makefile would be visible.  This release ensures they are visible
  immediately, even when invoking $(shell ...) functions.  Also, command line
  variable assignments are now always present in MAKEFLAGS, even when parsing
  makefiles.
  Implementation provided by Dmitry Goncharov <dgoncharov@users.sf.net>

* New feature: Parallel builds of archives
  Previously it was not possible to use parallel builds with archives.  It is
  still not possible using the built-in rules, however you can now override
  the built-in rules with a slightly different set of rules and use parallel
  builds with archive creation.  See the "Dangers When Using Archives" section
  of the GNU Make manual, and https://savannah.gnu.org/bugs/index.php?14927

* Previously target-specific variables would inherit their "export" capability
  from parent target-specific variables even if they were marked private.  Now
  private parent target-specific variables have no affect.  For more details
  see https://savannah.gnu.org/bugs/index.php?61463

* Disable FIFO jobserver on GNU/Hurd and Cygwin
  Experimentation shows that the new FIFO-based jobserver doesn't work well on
  GNU/Hurd or Cygwin: revert these systems to use the pipe-based jobserver.

* Updates to allow building on OS/2
  Provided by KO Myung-Hun <komh78@gmail.com>

* New platform: GNU Make is supported on z/OS
  Thanks to Igor Todorovski <itodorov@ca.ibm.com> for the patches and testing
  assistance.


Version 4.4 (31 Oct 2022)

A complete list of bugs fixed in this version is available here:

https://sv.gnu.org/bugs/index.php?group=make&report_id=111&fix_release_id=109&set=custom

* WARNING: Deprecation!
  The following systems are deprecated in this release:
    - OS/2 (EMX)
    - AmigaOS
    - Xenix
    - Cray
  In the NEXT release of GNU Make, support for these systems will be removed.
  If you want to see them continue to be supported, contact <bug-make@gnu.org>.

* WARNING: Future backward-incompatibility!
  In the NEXT release of GNU Make, pattern rules will implement the same
  behavior change for multiple targets as explicit grouped targets, below: if
  any target of the rule is needed by the build, the recipe will be invoked if
  any target of the rule is missing or out of date.  During testing some
  makefiles were found to contain pattern rules that do not build all targets;
  this can cause issues so we are delaying this change for one release cycle
  to allow these makefiles to be updated.  GNU Make shows a warning if it
  detects this situation: "pattern recipe did not update peer target".

* WARNING: Backward-incompatibility!
  GNU Make now uses temporary files in more situations than previous releases.
  If your build system sets TMPDIR (or TMP or TEMP on Windows) and deletes the
  contents during the build, or uses restrictive permissions, this may cause
  problems.  You can choose an alternative temporary directory only for use by
  GNU Make by setting the new MAKE_TMPDIR environment variable before invoking
  make.  Note that this value CANNOT be set inside the makefile, since make
  needs to find its temporary directory before the makefiles are parsed.

* WARNING: Backward-incompatibility!
  Previously each target in a explicit grouped target rule was considered
  individually: if the targets needed by the build were not out of date the
  recipe was not run even if other targets in the group were out of date.  Now
  if any of the grouped targets are needed by the build, then if any of the
  grouped targets are out of date the recipe is run and all targets in the
  group are considered updated.

* WARNING: Backward-incompatibility!
  Previously if --no-print-directory was seen anywhere in the environment or
  command line it would take precedence over any --print-directory.  Now, the
  last setting of directory printing options seen will be used, so a command
  line such as "--no-print-directory -w" _will_ show directory entry/exits.

* WARNING: Backward-incompatibility!
  Previously the order in which makefiles were remade was not explicitly
  stated, but it was (roughly) the inverse of the order in which they were
  processed by make.  In this release, the order in which makefiles are
  rebuilt is the same order in which make processed them, and this is defined
  to be true in the GNU Make manual.

* WARNING: Backward-incompatibility!
  Previously only simple (one-letter) options were added to the MAKEFLAGS
  variable that was visible while parsing makefiles.  Now, all options are
  available in MAKEFLAGS.  If you want to check MAKEFLAGS for a one-letter
  option, expanding "$(firstword -$(MAKEFLAGS))" is a reliable way to return
  the set of one-letter options which can be examined via findstring, etc.

* WARNING: Backward-incompatibility!
  Previously makefile variables marked as export were not exported to commands
  started by the $(shell ...) function.  Now, all exported variables are
  exported to $(shell ...).  If this leads to recursion during expansion, then
  for backward-compatibility the value from the original environment is used.
  To detect this change search for 'shell-export' in the .FEATURES variable.

* WARNING: New build requirement
  GNU Make utilizes facilities from GNU Gnulib: Gnulib requires certain C99
  features in the C compiler and so these features are required by GNU Make:
  https://www.gnu.org/software/gnulib/manual/html_node/C99-features-assumed.html
  The configure script should verify the compiler has these features.

* New feature: The .WAIT special target
  If the .WAIT target appears between two prerequisites of a target, then
  GNU Make will wait for all of the targets to the left of .WAIT in the list
  to complete before starting any of the targets to the right of .WAIT.
  This feature is available in some other versions of make, and it will be
  required by an upcoming version of the POSIX standard for make.
  Different patches were made by Alexey Neyman <alex.neyman@auriga.ru> (2005)
  and Steffen Nurpmeso <steffen@sdaoden.eu> (2020) that were useful but the
  result is a different implementation (closer to Alexey's idea).

* New feature: .NOTPARALLEL accepts prerequisites
  If the .NOTPARALLEL special target has prerequisites then all prerequisites
  of those targets will be run serially (as if .WAIT was specified between
  each prerequisite).

* New feature: The .NOTINTERMEDIATE special target
  .NOTINTERMEDIATE disables intermediate behavior for specific files, for all
  files built using a pattern, or for the entire makefile.
  Implementation provided by Dmitry Goncharov <dgoncharov@users.sf.net>

* New feature: The $(let ...) function
  This function allows user-defined functions to define a set of local
  variables: values can be assigned to these variables from within the
  user-defined function and they will not impact global variable assignments.
  Implementation provided by Jouke Witteveen <j.witteveen@gmail.com>

* New feature: The $(intcmp ...) function
  This function allows conditional evaluation controlled by a numerical
  comparison.
  Implementation provided by Jouke Witteveen <j.witteveen@gmail.com>

* New feature: Improved support for -l / --load-average
  On systems that provide /proc/loadavg (Linux), GNU Make will use it to
  determine the number of runnable jobs and use this as the current load,
  avoiding the need for heuristics.
  Implementation provided by Sven C. Dack <sdack@gmx.com>

* New feature: The --shuffle command line option
  This option reorders goals and prerequisites to simulate non-determinism
  that may be seen using parallel build.  Shuffle mode allows a form of "fuzz
  testing" of parallel builds to verify that all prerequisites are correctly
  described in the makefile.
  Implementation provided by Sergei Trofimovich <siarheit@google.com>

* New feature: The --jobserver-style command line option and named pipes
  A new jobserver method is used on systems where mkfifo(3) is supported.
  This solves a number of obscure issues related to using the jobserver
  and recursive invocations of GNU Make.  This change means that sub-makes
  will connect to the jobserver even if they are not marked as recursive.
  It also means that other tools that want to participate in the jobserver
  will need to be enhanced as described in the GNU Make manual.
  You can force GNU Make to use the simple pipe-based jobserver (perhaps if
  you are integrating with other tools or older versions of GNU Make) by
  adding the '--jobserver-style=pipe' option to the command line of the
  top-level invocation of GNU Make, or via MAKEFLAGS or GNUMAKEFLAGS.
  To detect this change search for 'jobserver-fifo' in the .FEATURES variable.

* Some POSIX systems (*BSD) do not allow locks to be taken on pipes, which
  caused the output sync feature to not work properly there.  Also multiple
  invocations of make redirecting to the same output file (e.g., /dev/null)
  would cause hangs.  Instead of locking stdout (which does have some useful
  performance characteristics, but is not portable) create a temporary file
  and lock that.  Windows continues to use a mutex as before.

* GNU Make has sometimes chosen unexpected, and sub-optimal, chains of
  implicit rules due to the definition of "ought to exist" in the implicit
  rule search algorithm, which considered any prerequisite mentioned in the
  makefile as "ought to exist".  This algorithm has been modified to prefer
  prerequisites mentioned explicitly in the target being built and only if
  that results in no matching rule, will GNU Make consider prerequisites
  mentioned in other targets as "ought to exist".
  Implementation provided by Dmitry Goncharov <dgoncharov@users.sf.net>

* GNU Make was performing secondary expansion of all targets, even targets
  which didn't need to be considered during the build.  In this release
  only targets which are considered will be secondarily expanded.
  Implementation provided by Dmitry Goncharov <dgoncharov@users.sf.net>

* If the MAKEFLAGS variable is modified in a makefile, it will be re-parsed
  immediately rather than after all makefiles have been read.  Note that
  although all options are parsed immediately, some special effects won't
  appear until after all makefiles are read.

* The -I option accepts an argument "-" (e.g., "-I-") which means "reset the
  list of search directories to empty".  Among other things this can be used
  to prevent GNU Make from searching in its default list of directories.

* New debug option "print" will show the recipe to be run, even when silent
  mode is set, and new debug option "why" will show why a target is rebuilt
  (which prerequisites caused the target to be considered out of date).
  Implementation provided by David Boyce <David.S.Boyce@gmail.com>

* The existing --trace option is made equivalent to --debug=print,why

* Target-specific variables can now be marked "unexport".

* Exporting / unexporting target-specific variables is handled correctly, so
  that the attribute of the most specific variable setting is used.

* Special targets like .POSIX are detected upon definition, ensuring that any
  change in behavior takes effect immediately, before the next line is parsed.

* When the pipe-based jobserver is enabled and GNU Make decides it is invoking
  a non-make sub-process and closes the jobserver pipes, it will now add a new
  option to the MAKEFLAGS environment variable that disables the jobserver.
  This prevents sub-processes that invoke make from accidentally using other
  open file descriptors as jobserver pipes.  For more information see
  https://savannah.gnu.org/bugs/?57242 and https://savannah.gnu.org/bugs/?62397

* A long-standing issue with the directory cache has been resolved: changes
  made as a side-effect of some other target's recipe are now noticed as
  expected.

* GNU Make can now be built for MS-Windows using the Tiny C tcc compiler.
  Port provided by Christian Jullien <eligis@orange.fr>


Version 4.3 (19 Jan 2020)

A complete list of bugs fixed in this version is available here:

https://sv.gnu.org/bugs/index.php?group=make&report_id=111&fix_release_id=108&set=custom

* WARNING: Backward-incompatibility!
  Number signs (#) appearing inside a macro reference or function invocation
  no longer introduce comments and should not be escaped with backslashes:
  thus a call such as:
    foo := $(shell echo '#')
  is legal.  Previously the number sign needed to be escaped, for example:
    foo := $(shell echo '\#')
  Now this latter will resolve to "\#".  If you want to write makefiles
  portable to both versions, assign the number sign to a variable:
    H := \#
    foo := $(shell echo '$H')
  This was claimed to be fixed in 3.81, but wasn't, for some reason.
  To detect this change search for 'nocomment' in the .FEATURES variable.

* WARNING: Backward-incompatibility!
  Previously appending using '+=' to an empty variable would result in a value
  starting with a space.  Now the initial space is only added if the variable
  already contains some value.  Similarly, appending an empty string does not
  add a trailing space.

* WARNING: Backward-incompatibility!
  Previously using the .SILENT pseudo-target in a makefile would force all
  sub-makes to be invoked with the '-s' option, effectively making all
  sub-makes silent as well.  In this release .SILENT only affects the current
  invocation of make.  A side-effect of this is that .SILENT will no longer
  enable the --no-print-directory option, which using -s will do.

* NOTE: Deprecated behavior.
  Contrary to the documentation, suffix rules with prerequisites are being
  treated BOTH as simple targets AND as pattern rules.  Further, the
  prerequisites are ignored by the pattern rules.  POSIX specifies that in
  order to be a suffix rule there can be no prerequisites defined.  In this
  release if POSIX mode is enabled then rules with prerequisites cannot be
  suffix rules.  If POSIX mode is not enabled then the previous behavior is
  preserved (a pattern rule with no extra prerequisites is created) AND a
  warning about this behavior is generated:
    warning: ignoring prerequisites on suffix rule definition
  The POSIX behavior will be adopted as the only behavior in a future release
  of GNU Make so please resolve any warnings.

* New feature: Grouped explicit targets
  Pattern rules have always had the ability to generate multiple targets with
  a single invocation of the recipe.  It's now possible to declare that an
  explicit rule generates multiple targets with a single invocation.  To use
  this, replace the ":" token with "&:" in the rule.  To detect this feature
  search for 'grouped-target' in the .FEATURES special variable.
  Implementation contributed by Kaz Kylheku <kaz@kylheku.com>

* New feature: .EXTRA_PREREQS variable
  Words in this variable are considered prerequisites of targets but they are
  not added to any of the automatic variable values when expanding the
  recipe.  This variable can either be global (applies to all targets) or
  a target-specific variable.  To detect this feature search for 'extra-prereqs'
  in the .FEATURES special variable.
  Implementation contributed by Christof Warlich <cwarlich@gmx.de>

* Makefiles can now specify the '-j' option in their MAKEFLAGS variable and
  this will cause make to enable that parallelism mode.

* GNU Make will now use posix_spawn() on systems where it is available.
  If you prefer to use fork/exec even on systems where posix_spawn() is
  present, you can use the --disable-posix-spawn option to configure.
  Implementation contributed by Aron Barath <baratharon@caesar.elte.hu>

* Error messages printed when invoking non-existent commands have been cleaned
  up and made consistent.

* The previous limit of 63 jobs under -jN on MS-Windows is now
  increased to 4095.  That limit includes the subprocess started by
  the $(shell) function.

* A new option --no-silent has been added, that cancels the effect of the
  -s/--silent/--quiet flag.

* A new option -E has been added as a short alias for --eval.

* All wildcard expansion within GNU Make, including $(wildcard ...), will sort
  the results.  See https://savannah.gnu.org/bugs/index.php?52076

* Interoperate with newer GNU libc and musl C runtime libraries.

* Performance improvements provided by Paolo Bonzini <pbonzini@redhat.com>

GNU Make Developer News

* Import the GNU standard bootstrap script to replace the hand-rolled
  "make update" method for building code from a GNU Make Git repository.

* Rework the source distribution to move source files into the src/*
  subdirectory.  This aligns with modern best practices in GNU.

* Replace local portability code with Gnulib content.  Unfortunately due to a
  problem with Gnulib support for getloadavg, this forces a requirement on
  Automake 1.16 or above in order to build from Git.  See README.git.


Version 4.2.1 (10 Jun 2016)

A complete list of bugs fixed in this version is available here:

https://sv.gnu.org/bugs/index.php?group=make&report_id=111&fix_release_id=107&set=custom

This release is a bug-fix release.


Version 4.2 (22 May 2016)

A complete list of bugs fixed in this version is available here:

https://sv.gnu.org/bugs/index.php?group=make&report_id=111&fix_release_id=106&set=custom

* New variable: $(.SHELLSTATUS) is set to the exit status of the last != or
  $(shell ...) function invoked in this instance of make.  This will be "0" if
  successful or not "0" if not successful.  The variable value is unset if no
  != or $(shell ...) function has been invoked.

* The $(file ...) function can now read from a file with $(file <FILE).
  The function is expanded to the contents of the file.  The contents are
  expanded verbatim except that the final newline, if any, is stripped.

* The makefile line numbers shown by GNU Make now point directly to the
  specific line in the recipe where the failure or warning occurred.
  Sample changes suggested by Brian Vandenberg <phantall@gmail.com>

* The interface to GNU Make's "jobserver" is stable as documented in the
  manual, for tools which may want to access it.

  WARNING: Backward-incompatibility! The internal-only command line option
  --jobserver-fds has been renamed for publishing, to --jobserver-auth.

* The amount of parallelism can be determined by querying MAKEFLAGS, even when
  the job server is enabled (previously MAKEFLAGS would always contain only
  "-j", with no number, when job server was enabled).

* VMS-specific changes:

  * Perl test harness now works.

  * Full support for converting Unix exit status codes to VMS exit status
    codes.  BACKWARD INCOMPATIBILITY Notice: On a child failure the VMS exit
    code is now the encoded Unix exit status that Make usually generates, not
    the VMS exit status of the child.


Version 4.1 (05 Oct 2014)

A complete list of bugs fixed in this version is available here:

https://sv.gnu.org/bugs/index.php?group=make&report_id=111&fix_release_id=105&set=custom

* New variables: $(MAKE_TERMOUT) and $(MAKE_TERMERR) are set to non-empty
  values if stdout or stderr, respectively, are believed to be writing to a
  terminal.  These variables are exported by default.

* Allow a no-text-argument form of the $(file ...) function.  Without a text
  argument nothing is written to the file: it is simply opened in the
  requested mode, then closed again.

* Change the fatal error for mixed explicit and implicit rules, that was
  introduced in GNU Make 3.82, to a non-fatal error.  However, this syntax is
  still deprecated and may return to being illegal in a future version of GNU
  make.  Makefiles that rely on this syntax should be fixed.
  See https://savannah.gnu.org/bugs/?33034

* VMS-specific changes:

  * Support for library files added, including support for using the GNV ar
    utility.

  * Partial support for properly encoding Unix exit status codes into VMS exit
    status codes.

    WARNING: Backward-incompatibility! These are different exit status codes
    than Make exited with in the past.

  * Macros to hold the current make command are set up to translate the
    argv[0] string to a VMS format path name and prefix it with "MCR " so that
    the macro has a space in it.

    WARNING: Backward-incompatibility!  This may break complex makefiles that
    do processing on those macros.  This is unlikely because so much in that
    area was not and is still not currently working on VMS, it is unlikely to
    find such a complex makefile, so this is more likely to impact
    construction of a future makefile.

  * A command file is always used to run the commands for a recipe.

    WARNING: Backward-incompatibility!  Running the make self tests has
    exposed that there are significant differences in behavior when running
    with the command file mode.  It is unknown if this will be noticed by most
    existing VMS makefiles.

Version 4.0 (09 Oct 2013)

A complete list of bugs fixed in this version is available here:

https://sv.gnu.org/bugs/index.php?group=make&report_id=111&fix_release_id=101&set=custom

* WARNING: Backward-incompatibility!
  If .POSIX is specified, then make adheres to the POSIX backslash/newline
  handling requirements, which introduces the following changes to the
  standard backslash/newline handling in non-recipe lines:
  * Any trailing space before the backslash is preserved
  * Each backslash/newline (plus subsequent whitespace) is converted to a
    single space

* New feature: GNU Guile integration
  This version of GNU Make can be compiled with GNU Guile integration.
  GNU Guile serves as an embedded extension language for make.
  See the "Guile Function" section in the GNU Make manual for details.
  Currently GNU Guile 1.8 and 2.0+ are supported.  In Guile 1.8 there is no
  support for internationalized character sets.  In Guile 2.0+, scripts can be
  encoded in UTF-8.

* New command line option: --output-sync (-O) enables grouping of output by
  target or by recursive make.  This is useful during parallel builds to avoid
  mixing output from different jobs together giving hard-to-understand
  results.  Original implementation by David Boyce <dsb@boyski.com>.
  Reworked and enhanced by Frank Heckenbach <f.heckenbach@fh-soft.de>.
  Windows support by Eli Zaretskii <eliz@gnu.org>.

* New command line option: --trace enables tracing of targets.  When enabled
  the recipe to be invoked is printed even if it would otherwise be suppressed
  by .SILENT or a "@" prefix character.  Also before each recipe is run the
  makefile name and linenumber where it was defined are shown as well as the
  prerequisites that caused the target to be considered out of date.

* New command line option argument: --debug now accepts a "n" (none) flag
  which disables all debugging settings that are currently enabled.

* New feature: The "job server" capability is now supported on Windows.
  Implementation contributed by Troy Runkel <Troy.Runkel@mathworks.com>

* New feature: The .ONESHELL capability is now supported on Windows.  Support
  added by Eli Zaretskii <eliz@gnu.org>.

* New feature: "!=" shell assignment operator as an alternative to the
  $(shell ...) function.  Implemented for compatibility with BSD makefiles.
  Note there are subtle differences between "!=" and $(shell ...).  See the
  description in the GNU Make manual.
  WARNING: Backward-incompatibility!
  Variables ending in "!" previously defined as "variable!= value" will now be
  interpreted as shell assignment.  Change your assignment to add whitespace
  between the "!" and "=": "variable! = value"

* New feature: "::=" simple assignment operator as defined by POSIX in 2012.
  This operator has identical functionality to ":=" in GNU Make, but will be
  portable to any implementation of make conforming to a sufficiently new
  version of POSIX (see https://austingroupbugs.net/view.php?id=330).  It is
  not necessary to define the .POSIX target to access this operator.

* New feature: Loadable objects
  This version of GNU Make contains a "technology preview": the ability to
  load dynamic objects into the make runtime.  These objects can be created by
  the user and can add extended functionality, usable by makefiles.

* New function: $(file ...) writes to a file.

* New variable: $(GNUMAKEFLAGS) will be parsed for make flags, just like
  MAKEFLAGS is.  It can be set in the environment or the makefile, containing
  GNU Make-specific flags to allow your makefile to be portable to other
  versions of make.  Once this variable is parsed, GNU Make will set it to the
  empty string so that flags will not be duplicated on recursion.

* New variable: `MAKE_HOST' gives the name of the host architecture
  make was compiled for.  This is the same value you see after 'Built for'
  when running 'make --version'.

* Behavior of MAKEFLAGS and MFLAGS is more rigorously defined.  All simple
  flags are grouped together in the first word of MAKEFLAGS.  No options that
  accept arguments appear in the first word.  If no simple flags are present
  MAKEFLAGS begins with a space.  Flags with both short and long versions
  always use the short versions in MAKEFLAGS.  Flags are listed in
  alphabetical order using ASCII ordering.  MFLAGS never begins with "- ".

* Setting the -r and -R options in MAKEFLAGS inside a makefile now works as
  expected, removing all built-in rules and variables, respectively.

* If a recipe fails, the makefile name and linenumber of the recipe are shown.

* A .RECIPEPREFIX setting is remembered per-recipe and variables expanded
  in that recipe also use that recipe prefix setting.

* In -p output, .RECIPEPREFIX settings are shown and all target-specific
  variables are output as if in a makefile, instead of as comments.

* On MS-Windows, recipes that use ".." quoting will no longer force
  invocation of commands via temporary batch files and stock Windows
  shells, they will be short-circuited and invoked directly.  (In
  other words, " is no longer a special character for stock Windows
  shells.)  This avoids hitting shell limits for command length when
  quotes are used, but nothing else in the command requires the shell.
  This change could potentially mean some minor incompatibilities in
  behavior when the recipe uses quoted string on shell command lines.


Version 3.82 (28 Jul 2010)

A complete list of bugs fixed in this version is available here:

https://sv.gnu.org/bugs/index.php?group=make&report_id=111&fix_release_id=104&set=custom

* Compiling GNU Make now requires a conforming ISO C 1989 compiler and
  standard runtime library.

* WARNING: Backward-incompatibility!
  The POSIX standard for make was changed in the 2008 version in a
  fundamentally incompatible way: make is required to invoke the shell as if
  the '-e' flag were provided.  Because this would break many makefiles that
  have been written to conform to the original text of the standard, the
  default behavior of GNU Make remains to invoke the shell with simply '-c'.
  However, any makefile specifying the .POSIX special target will follow the
  new POSIX standard and pass '-e' to the shell.  See also .SHELLFLAGS
  below.

* WARNING: Backward-incompatibility!
  The '$?' variable now contains all prerequisites that caused the target to
  be considered out of date, even if they do not exist (previously only
  existing targets were provided in $?).

* WARNING: Backward-incompatibility!
  Wildcards were not documented as returning sorted values, but the results
  have been sorted up until this release..  If your makefiles require sorted
  results from wildcard expansions, use the $(sort ...)  function to request
  it explicitly.

* WARNING: Backward-incompatibility!
  As a result of parser enhancements, three backward-compatibility issues
  exist: first, a prerequisite containing an "=" cannot be escaped with a
  backslash any longer.  You must create a variable containing an "=" and
  use that variable in the prerequisite.  Second, variable names can no
  longer contain whitespace, unless you put the whitespace in a variable and
  use the variable.  Third, in previous versions of make it was sometimes
  not flagged as an error for explicit and pattern targets to appear in the
  same rule.  Now this is always reported as an error.

* WARNING: Backward-incompatibility!
  The pattern-specific variables and pattern rules are now applied in the
  shortest stem first order instead of the definition order (variables
  and rules with the same stem length are still applied in the definition
  order). This produces the usually-desired behavior where more specific
  patterns are preferred. To detect this feature search for 'shortest-stem'
  in the .FEATURES special variable.

* WARNING: Backward-incompatibility!
  The library search behavior has changed to be compatible with the standard
  linker behavior. Prior to this version for prerequisites specified using
  the -lfoo syntax make first searched for libfoo.so in the current
  directory, vpath directories, and system directories. If that didn't yield
  a match, make then searched for libfoo.a in these directories. Starting
  with this version make searches first for libfoo.so and then for libfoo.a
  in each of these directories in order.

* New command line option: --eval=STRING causes STRING to be evaluated as
  makefile syntax (akin to using the $(eval ...) function).  The evaluation
  is performed after all default rules and variables are defined, but before
  any makefiles are read.

* New special variable: .RECIPEPREFIX allows you to reset the recipe
  introduction character from the default (TAB) to something else.  The
  first character of this variable value is the new recipe introduction
  character.  If the variable is set to the empty string, TAB is used again.
  It can be set and reset at will; recipes will use the value active when
  they were first parsed.  To detect this feature check the value of
  $(.RECIPEPREFIX).

* New special variable: .SHELLFLAGS allows you to change the options passed
  to the shell when it invokes recipes.  By default the value will be "-c"
  (or "-ec" if .POSIX is set).

* New special target: .ONESHELL instructs make to invoke a single instance
  of the shell and provide it with the entire recipe, regardless of how many
  lines it contains.  As a special feature to allow more straightforward
  conversion of makefiles to use .ONESHELL, any recipe line control
  characters ('@', '+', or '-') will be removed from the second and
  subsequent recipe lines.  This happens _only_ if the SHELL value is deemed
  to be a standard POSIX-style shell.  If not, then no interior line control
  characters are removed (as they may be part of the scripting language used
  with the alternate SHELL).

* New variable modifier 'private': prefixing a variable assignment with the
  modifier 'private' suppresses inheritance of that variable by
  prerequisites.  This is most useful for target- and pattern-specific
  variables.

* New make directive: 'undefine' allows you to undefine a variable so that
  it appears as if it was never set. Both $(flavor) and $(origin) functions
  will return 'undefined' for such a variable. To detect this feature search
  for 'undefine' in the .FEATURES special variable.

* The parser for variable assignments has been enhanced to allow multiple
  modifiers ('export', 'override', 'private') on the same line as variables,
  including define/endef variables, and in any order.  Also, it is possible
  to create variables and targets named as these modifiers.

* The 'define' make directive now allows a variable assignment operator
  after the variable name, to allow for simple, conditional, or appending
  multi-line variable assignment.

* VMS-specific changes:

  * Michael Gehre (at VISTEC-SEMI dot COM) supplied a fix for a problem with
    timestamps of object modules in OLBs. The timestamps were not correctly
    adjusted to GMT based time, if the local VMS time was using a daylight
    saving algorithm and if daylight saving was switched off.

  * John Eisenbraun (at HP dot COM) supplied fixes and and an enhancement to
    append output redirection in action lines.

  * Rework of ctrl+c and ctrl+y handling.

  * Fix a problem with cached strings, which showed on case-insensitive file
    systems.

  * Build fixes for const-ified code in VMS specific sources.

  * A note on appending the redirected output. With this change, a simple
    mechanism is implemented to make ">>" work in action lines. In VMS
    there is no simple feature like ">>" to have DCL command or program
    output redirected and appended to a file. GNU Make for VMS already
    implements the redirection of output. If such a redirection is detected,
    an ">" on the action line, GNU Make creates a DCL command procedure to
    execute the action and to redirect its output. Based on that, now ">>"
    is also recognized and a similar but different command procedure is
    created to implement the append. The main idea here is to create a
    temporary file which collects the output and which is appended to the
    wanted output file. Then the temporary file is deleted. This is all done
    in the command procedure to keep changes in make small and simple. This
    obviously has some limitations but it seems good enough compared with
    the current ">" implementation. (And in my opinion, redirection is not
    really what GNU Make has to do.) With this approach, it may happen that
    the temporary file is not yet appended and is left in SYS$SCRATCH.
    The temporary file names look like "CMDxxxxx.". Any time the created
    command procedure can not complete, this happens. Pressing Ctrl+Y to
    abort make is one case. In case of Ctrl+Y the associated command
    procedure is left in SYS$SCRATCH as well. Its name is CMDxxxxx.COM.

  * Change in the Ctrl+Y handling. The CtrlY handler now uses $delprc to
    delete all children. This way also actions with DCL commands will be
    stopped. As before the CtrlY handler then sends SIGQUIT to itself,
    which is handled in common code.

  * Change in deleteing temporary command files. Temporary command files
    are now deleted in the vms child termination handler. That deletes
    them even if a Ctrl+C was pressed.

  * The behavior of pressing Ctrl+C is not changed. It still has only an
    effect, after the current action is terminated. If that doesn't happen
    or takes too long, Ctrl+Y should be used instead.


Version 3.81 (01 Apr 2006)

* GNU Make is ported to OS/2.

* GNU Make is ported to MinGW.  The MinGW build is only supported by
  the build_w32.bat batch file; see the file README.W32 for more
  details.

* WARNING: Future backward-incompatibility!
  Up to and including this release, the '$?' variable does not contain
  any prerequisite that does not exist, even though that prerequisite
  might have caused the target to rebuild.  Starting with the _next_
  release of GNU Make, '$?' will contain all prerequisites that caused
  the target to be considered out of date.
  See https://savannah.gnu.org/bugs/?16051

* WARNING: Backward-incompatibility!
  GNU Make now implements a generic "second expansion" feature on the
  prerequisites of both explicit and implicit (pattern) rules.  In order
  to enable this feature, the special target '.SECONDEXPANSION' must be
  defined before the first target which takes advantage of it.  If this
  feature is enabled then after all rules have been parsed the
  prerequisites are expanded again, this time with all the automatic
  variables in scope.  This means that in addition to using standard
  SysV $$@ in prerequisites lists, you can also use complex functions
  such as $$(notdir $$@) etc.  This behavior applies to implicit rules,
  as well, where the second expansion occurs when the rule is matched.
  However, this means that when '.SECONDEXPANSION' is enabled you must
  double-quote any "$" in your filenames; instead of "foo: boo$$bar" you
  now must write "foo: foo$$$$bar".  Note that the SysV $$@ etc. feature,
  which used to be available by default, is now ONLY available when the
  .SECONDEXPANSION target is defined.  If your makefiles take advantage
  of this SysV feature you will need to update them.

* WARNING: Backward-incompatibility!
  In order to comply with POSIX, the way in which GNU Make processes
  backslash-newline sequences in recipes has changed.  If your makefiles
  use backslash-newline sequences inside of single-quoted strings in
  recipes you will be impacted by this change.  See the GNU Make manual
  subsection "Splitting Recipe Lines" (node "Splitting Lines"), in
  section "Recipe Syntax", chapter "Writing Recipe in Rules", for
  details.

* WARNING: Backward-incompatibility!
  Some previous versions of GNU Make had a bug where "#" in a function
  invocation such as $(shell ...) was treated as a make comment.  A
  workaround was to escape these with backslashes.  This bug has been
  fixed: if your makefile uses "\#" in a function invocation the
  backslash is now preserved, so you'll need to remove it.

* New command line option: -L (--check-symlink-times).  On systems that
  support symbolic links, if this option is given then GNU Make will
  use the most recent modification time of any symbolic links that are
  used to resolve target files.  The default behavior remains as it
  always has: use the modification time of the actual target file only.

* The "else" conditional line can now be followed by any other valid
  conditional on the same line: this does not increase the depth of the
  conditional nesting, so only one "endif" is required to close the
  conditional.

* All pattern-specific variables that match a given target are now used
  (previously only the first match was used).

* Target-specific variables can be marked as exportable using the
  "export" keyword.

* In a recursive $(call ...) context, any extra arguments from the outer
  call are now masked in the context of the inner call.

* Implemented a solution for the "thundering herd" problem with "-j -l".
  This version of GNU Make uses an algorithm suggested by Thomas Riedl
  <thomas.riedl@siemens.com> to track the number of jobs started in the
  last second and artificially adjust GNU Make's view of the system's
  load average accordingly.

* New special variables available in this release:
   - .INCLUDE_DIRS: Expands to a list of directories that make searches
     for included makefiles.
   - .FEATURES: Contains a list of special features available in this
     version of GNU Make.
   - .DEFAULT_GOAL: Set the name of the default goal make will
     use if no goals are provided on the command line.
   - MAKE_RESTARTS: If set, then this is the number of times this
     instance of make has been restarted (see "How Makefiles Are Remade"
     in the manual).
   - New automatic variable: $| (added in 3.80, actually): contains all
     the order-only prerequisites defined for the target.

* New functions available in this release:
   - $(lastword ...) returns the last word in the list.  This gives
     identical results as $(word $(words ...) ...), but is much faster.
   - $(abspath ...) returns the absolute path (all "." and ".."
     directories resolved, and any duplicate "/" characters removed) for
     each path provided.
   - $(realpath ...) returns the canonical pathname for each path
     provided.  The canonical pathname is the absolute pathname, with
     all symbolic links resolved as well.
   - $(info ...) prints its arguments to stdout.  No makefile name or
     line number info, etc. is printed.
   - $(flavor ...) returns the flavor of a variable.
   - $(or ...) provides a short-circuiting OR conditional: each argument
     is expanded.  The first true (non-empty) argument is returned; no
     further arguments are expanded.  Expands to empty if there are no
     true arguments.
   - $(and ...) provides a short-circuiting AND conditional: each
     argument is expanded.  The first false (empty) argument is
     returned; no further arguments are expanded.  Expands to the last
     argument if all arguments are true.

* Changes made for POSIX compatibility:
   - Only touch targets (under -t) if they have a recipe.
   - Setting the SHELL make variable does NOT change the value of the
     SHELL environment variable given to programs invoked by make.  As
     an enhancement to POSIX, if you export the make variable SHELL then
     it will be set in the environment, just as before.

* On MS Windows systems, explicitly setting SHELL to a pathname ending
  in "cmd" or "cmd.exe" (case-insensitive) will force GNU Make to use
  the DOS command interpreter in batch mode even if a UNIX-like shell
  could be found on the system.

* On VMS there is now support for case-sensitive filesystems such as ODS5.
  See the README.VMS file for information.

* Parallel builds (-jN) no longer require a working Bourne shell on
  Windows platforms.  They work even with the stock Windows shells, such
  as cmd.exe and command.com.

* Updated to autoconf 2.59, automake 1.9.5, and gettext 0.14.1.  Users
  should not be impacted.

* New translations for Swedish, Chinese (simplified), Ukrainian,
  Belarusian, Finnish, Kinyarwandan, and Irish.  Many updated
  translations.

A complete list of bugs fixed in this version is available here:

  https://savannah.gnu.org/bugs/index.php?group=make&report_id=111&fix_release_id=103


Version 3.80 (03 Oct 2002)

* A new feature exists: order-only prerequisites.  These prerequisites
  affect the order in which targets are built, but they do not impact
  the rebuild/no-rebuild decision of their dependents.  That is to say,
  they allow you to require target B be built before target A, without
  requiring that target A will always be rebuilt if target B is updated.
  Patch for this feature provided by Greg McGary <greg@mcgary.org>.

* For compatibility with SysV make, GNU Make now supports the peculiar
  syntax $$@, $$(@D), and $$(@F) in the prerequisites list of a rule.
  This syntax is only valid within explicit and static pattern rules: it
  cannot be used in implicit (suffix or pattern) rules.  Edouard G. Parmelan
  <egp@free.fr> provided a patch implementing this feature; however, I
  decided to implement it in a different way.

* The argument to the "ifdef" conditional is now expanded before it's
  tested, so it can be a constructed variable name.

  Similarly, the arguments to "export" (when not used in a variable
  definition context) and "unexport" are also now expanded.

* A new function is defined: $(value ...).  The argument to this
  function is the _name_ of a variable.  The result of the function is
  the value of the variable, without having been expanded.

* A new function is defined: $(eval ...).  The arguments to this
  function should expand to makefile commands, which will then be
  evaluated as if they had appeared in the makefile.  In combination
  with define/endef multiline variable definitions this is an extremely
  powerful capability.  The $(value ...) function is also sometimes
  useful here.

* A new built-in variable is defined, $(MAKEFILE_LIST).  It contains a
  list of each makefile GNU Make has read, or started to read, in the
  order in which they were encountered.  So, the last filename in the
  list when a makefile is just being read (before any includes) is the
  name of the current makefile.

* A new built-in variable is defined: $(.VARIABLES).  When it is
  expanded it returns a complete list of variable names defined by all
  makefiles at that moment.

* A new command line option is defined, -B or --always-make.  If
  specified GNU Make will consider all targets out-of-date even if they
  would otherwise not be.

* The arguments to $(call ...) functions were being stored in $1, $2,
  etc. as recursive variables, even though they are fully expanded
  before assignment.  This means that escaped dollar signs ($$ etc.)
  were not behaving properly.  Now the arguments are stored as simple
  variables.  This may mean that if you added extra escaping to your
  $(call ...) function arguments you will need to undo it now.

* The variable invoked by $(call ...) can now be recursive: unlike other
  variables it can reference itself and this will not produce an error
  when it is used as the first argument to $(call ...) (but only then).

* New pseudo-target .LOW_RESOLUTION_TIME, superseding the configure
  option --disable-nsec-timestamps.  You might need this if your build
  process depends on tools like "cp -p" preserving time stamps, since
  "cp -p" (right now) doesn't preserve the subsecond portion of a time
  stamp.

* Updated translations for French, Galician, German, Japanese, Korean,
  and Russian.  New translations for Croatian, Danish, Hebrew, and
  Turkish.

* Updated internationalization support to Gettext 0.11.5.
  GNU Make now uses Gettext's "external" feature, and does not include
  any internationalization code itself.  Configure will search your
  system for an existing implementation of GNU Gettext (only GNU Gettext
  is acceptable) and use it if it exists.  If not, NLS will be disabled.
  See ABOUT-NLS for more information.

* Updated to autoconf 2.54 and automake 1.7.  Users should not be impacted.

* VMS-specific changes:

  * In default.c define variable ARCH as IA64 for VMS on Itanium systems.

  * In makefile.vms avoid name collision for glob and globfree.

  * This is the VMS port of GNU Make done by Hartmut.Becker@compaq.com.

    It is based on the specific version 3.77k and on 3.78.1. 3.77k was done
    by Klaus K<>mpf <kkaempf@rmi.de>, the code was based on the VMS port of
    GNU Make 3.60 by Mike Moretti.

    It was ported on OpenVMS/Alpha V7.1, DECC V5.7-006. It was re-build and
    tested on OpenVMS/Alpha V7.2, OpenVMS/VAX 7.1 and 5.5-2. Different
    versions of DECC were used. VAXC was tried: it fails; but it doesn't
    seem worth to get it working. There are still some PTRMISMATCH warnings
    during the compile. Although perl is working on VMS the test scripts
    don't work. The function $shell is still missing.

    There is a known bug in some of the VMS CRTLs. It is in the shipped
    versions of VMS V7.2 and V7.2-1 and in the currently (October 1999)
    available ECOs for VMS V7.1 and newer versions. It is fixed in versions
    shipped with newer VMS versions and all ECO kits after October 1999. It
    only shows up during the daylight saving time period (DST): stat()
    returns a modification time 1 hour ahead. This results in GNU Make
    warning messages. For a just created source you will see:

     $ gmake x.exe
     gmake.exe;1: *** Warning: File 'x.c' has modification time in the future
     (940582863 > 940579269)
     cc    /obj=x.obj x.c
     link  x.obj    /exe=x.exe
     gmake.exe;1: *** Warning:  Clock skew detected.  Your build may be
     incomplete.


A complete list of bugs fixed in this version is available here:

  https://savannah.gnu.org/bugs/index.php?group=make&report_id=111&fix_release_id=102


Version 3.79.1 (23 Jun 2000)

* .SECONDARY with no prerequisites now prevents any target from being
  removed because make thinks it's an intermediate file, not just those
  listed in the makefile.

* New configure option --disable-nsec-timestamps, but this was
  superseded in later versions by the .LOW_RESOLUTION_TIME pseudo-target.

Version 3.79 (04 Apr 2000)

* GNU Make optionally supports internationalization and locales via the
  GNU gettext (or local gettext if suitable) package.  See the ABOUT-NLS
  file for more information on configuring GNU Make for NLS.

* Previously, GNU Make quoted variables such as MAKEFLAGS and
  MAKEOVERRIDES for proper parsing by the shell.  This allowed them to
  be used within make build scripts.  However, using them there is not
  proper behavior: they are meant to be passed to subshells via the
  environment.  Unfortunately the values were not quoted properly to be
  passed through the environment.  This meant that make didn't properly
  pass some types of command line values to submakes.

  With this version we change that behavior: now these variables are
  quoted properly for passing through the environment, which is the
  correct way to do it.  If you previously used these variables
  explicitly within a make rule you may need to re-examine your use for
  correctness given this change.

* A new pseudo-target .NOTPARALLEL is available.  If defined, the
  current makefile is run serially regardless of the value of -j.
  However, submakes are still eligible for parallel execution.

* The --debug option has changed: it now allows optional flags
  controlling the amount and type of debugging output.  By default only
  a minimal amount information is generated, displaying the names of
  "normal" targets (not makefiles) that were deemed out of date and in
  need of being rebuilt.

  Note that the -d option behaves as before: it takes no arguments and
  all debugging information is generated.

* The `-p' (print database) output now includes filename and linenumber
  information for variable definitions, to aid debugging.

* The wordlist function no longer reverses its arguments if the "start"
  value is greater than the "end" value.  If that's true, nothing is
  returned.

* Hartmut Becker provided many updates for the VMS port of GNU Make.
  See the README.VMS file for more details.

* VMS-specific changes:

  * Fix a problem with automatically remaking makefiles. GNU Make uses an
    execve to restart itself after a successful remake of the makefile. On
    UNIX systems execve replaces the running program with a new one and
    resets all signal handling to the default. On VMS execve creates a child
    process, signal and exit handlers of the parent are still active, and,
    unfortunately, corrupt the exit code from the child. Fix in job.c:
    ignore SIGCHLD.

  * Added some switches to reflect latest features of DECC. Modifications in
    makefile.vms.

  * Set some definitions to reflect latest features of DECC. Modifications in
    config.h-vms (which is copied to config.h).

  * Added extern strcmpi declaration to avoid 'implicitly declared' messages.
    Modification in make.h.

  * Default rule for C++, conditionals for gcc (GCC_IS_NATIVE) or DEC/Digital/
    Compaq c/c++ compilers. Modifications in default.c.

  * Usage of opendir() and friends, suppress file version. Modifications in
    dir.c.

  * Added VMS specific code to handle ctrl+c and ctrl+y to abort make.
    Modifications in job.c.

  * Added support to have case sensitive targets and dependencies but to
    still use case blind file names. This is especially useful for Java
    makefiles on VMS:

        .SUFFIXES :
        .SUFFIXES : .class .java
        .java.class :
                javac "$<
        HelloWorld.class :      HelloWorld.java

  * A new macro WANT_CASE_SENSITIVE_TARGETS in config.h-vms was introduced.
    It needs to be enabled to get this feature; default is disabled.  The
    macro HAVE_CASE_INSENSITIVE_FS must not be touched: it is still enabled.
    Modifications in file.c and config.h-vms.

  * Bootstrap make to start building make is still makefile.com, but make
    needs to be re-made with a make to make a correct version: ignore all
    possible warnings, delete all objects, rename make.exe to a different
    name and run it.

  * Made some minor modifications to the bootstrap build makefile.com.

Version 3.78 (22 Sep 1999)

* Two new functions, $(error ...) and $(warning ...) are available.  The
  former will cause make to fail and exit immediately upon expansion of
  the function, with the text provided as the error message.  The latter
  causes the text provided to be printed as a warning message, but make
  proceeds normally.

* A new function $(call ...) is available.  This allows users to create
  their own parameterized macros and invoke them later.  Original
  implementation of this function was provided by Han-Wen Nienhuys
  <hanwen@cs.uu.nl>.

* A new function $(if ...) is available.  It provides if-then-else
  capabilities in a builtin function.  Original implementation of this
  function was provided by Han-Wen Nienhuys <hanwen@cs.uu.nl>.

* Make defines a new variable, .LIBPATTERNS.  This variable controls how
  library dependency expansion (dependencies like ``-lfoo'') is performed.

* Make accepts CRLF sequences as well as traditional LF, for
  compatibility with makefiles created on other operating systems.

* Make accepts a new option: -R, or --no-builtin-variables.  This option
  disables the definition of the rule-specific builtin variables (CC,
  LD, AR, etc.).  Specifying this option forces -r (--no-builtin-rules)
  as well.

* A "job server" feature, suggested by Howard Chu <hyc@highlandsun.com>.

  On systems that support POSIX pipe(2) semantics, GNU Make can now pass
  -jN options to submakes rather than forcing them all to use -j1.  The
  top make and all its sub-make processes use a pipe to communicate with
  each other to ensure that no more than N jobs are started across all
  makes.  To get the old behavior of -j back, you can configure make
  with the --disable-job-server option.

* The confusing term "dependency" has been replaced by the more accurate
  and standard term "prerequisite", both in the manual and in all GNU Make
  output.

* GNU Make supports the "big archive" library format introduced in AIX 4.3.

* GNU Make supports large files on AIX, HP-UX, and IRIX.  These changes
  were provided by Paul Eggert <eggert@twinsun.com>.  (Large file
  support for Solaris and Linux was introduced in 3.77, but the
  configuration had issues: these have also been resolved).

* The Windows 95/98/NT (W32) version of GNU Make now has native support
  for the Cygnus Cygwin release B20.1 shell (bash).

* The GNU Make regression test suite, long available separately "under
  the table", has been integrated into the release.  You can invoke it
  by running "make check" in the distribution.  Note that it requires
  Perl (either Perl 4 or Perl 5) to run.

Version 3.77 (28 Jul 1998)

* Implement BSD make's "?=" variable assignment operator.  The variable
  is assigned the specified value only if that variable is not already
  defined.

* Make defines a new variable, "CURDIR", to contain the current working
  directory (after the -C option, if any, has been processed).
  Modifying this variable has no effect on the operation of make.

* Make defines a new default RCS rule, for new-style master file
  storage: ``% :: RCS/%'' (note no ``,v'' suffix).

  Make defines new default rules for DOS-style C++ file naming
  conventions, with ``.cpp'' suffixes.  All the same rules as for
  ``.cc'' and ``.C'' suffixes are provided, along with LINK.cpp and
  COMPILE.cpp macros (which default to the same value as LINK.cc and
  COMPILE.cc).  Note CPPFLAGS is still C preprocessor flags!  You should
  use CXXFLAGS to change C++ compiler flags.

* A new feature, "target-specific variable values", has been added.
  This is a large change so please see the appropriate sections of the
  manual for full details.  Briefly, syntax like this:

    TARGET: VARIABLE = VALUE

  defines VARIABLE as VALUE within the context of TARGET.  This is
  similar to SunOS make's "TARGET := VARIABLE = VALUE" feature.  Note
  that the assignment may be of any type, not just recursive, and that
  the override keyword is available.

  COMPATIBILITY: This new syntax means that if you have any rules where
  the first or second dependency has an equal sign (=) in its name,
  you'll have to escape them with a backslash: "foo : bar\=baz".
  Further, if you have any dependencies which already contain "\=",
  you'll have to escape both of them: "foo : bar\\\=baz".

* A new appendix listing the most common error and warning messages
  generated by GNU Make, with some explanation, has been added to the
  GNU Make User's Manual.

* Updates to the GNU Make Customs library support (see README.customs).

* Updates to the Windows 95/NT port from Rob Tulloh (see README.W32),
  and to the DOS port from Eli Zaretski (see README.DOS).

* VMS-specific changes:

  * This is the VMS port of GNU Make.
    It is based on the VMS port of GNU Make 3.60 by Mike Moretti.
    This port was done by Klaus K<>mpf <kkaempf@rmi.de>

  * There is first-level support available from proGIS Software, Germany.
    Visit their web-site at https://www.progis.de to get information
    about other vms software and forthcoming updates to gnu make.

  * /bin/sh style I/O redirection is supported. You can now write lines like
        mcr sys$disk:[]program.exe < input.txt > output.txt &> error.txt

  * Makefile variables are looked up in the current environment. You can set
    symbols or logicals in DCL and evaluate them in the Makefile via
    $(<name-of-symbol-or-logical>).  Variables defined in the Makefile
    override VMS symbols/logicals !

  * Functions for file names are working now. See the GNU Make manual for
    $(dir ...)  and $(wildcard ...).  Unix-style and VMS-style names are
    supported as arguments.

  * The default rules are set up for GNU C. Building an executable from a
    single source file is as easy as 'make file.exe'.

  * The variable $(ARCH) is predefined as ALPHA or VAX resp. Makefiles for
    different VMS systems can now be written by checking $(ARCH) as in
      ifeq ($(ARCH),ALPHA)
        $(ECHO) "On the Alpha"
      else
        $(ECHO) "On the VAX"
      endif

  * Command lines of excessive length are correctly broken and written to a
    batch file in sys$scratch for later execution. There's no limit to the
    lengths of commands (and no need for .opt files :-) any more.

  * Empty commands are handled correctly and don't end in a new DCL process.

Version 3.76.1 (19 Sep 1997)

* Small (but serious) bug fix.  Quick rollout to get into the GNU source CD.

Version 3.76 (16 Sep 1997)

* GNU Make now uses automake to control Makefile.in generation.  This
  should make it more consistent with the GNU standards.

* VPATH functionality has been changed to incorporate the VPATH+ patch,
  previously maintained by Paul Smith <psmith@baynetworks.com>.  See the
  manual.

* Make defines a new variable, `MAKECMDGOALS', to contain the goals that
  were specified on the command line, if any.  Modifying this variable
  has no effect on the operation of make.

* A new function, `$(wordlist S,E,TEXT)', is available: it returns a
  list of words from number S to number E (inclusive) of TEXT.

* Instead of an error, detection of future modification times gives a
  warning and continues.  The warning is repeated just before GNU Make
  exits, so it is less likely to be lost.

* Fix the $(basename) and $(suffix) functions so they only operate on
  the last filename, not the entire string:

      Command              Old Result             New Result
      -------              ----------             ----------
    $(basename a.b)        a                      a
    $(basename a.b/c)      a                      a.b/c
    $(suffix a.b)          b                      b
    $(suffix a.b/c)        b/c                    <empty>

* The $(strip) function now removes newlines as well as TABs and spaces.

* The $(shell) function now changes CRLF (\r\n) pairs to a space as well
  as newlines (\n).

* Updates to the Windows 95/NT port from Rob Tulloh (see README.W32).

* Eli Zaretskii has updated the port to 32-bit protected mode on MSDOS
  and MS-Windows, building with the DJGPP v2 port of GNU C/C++ compiler
  and utilities.  See README.DOS for details, and direct all questions
  concerning this port to Eli Zaretskii <eliz@is.elta.co.il> or DJ
  Delorie <dj@delorie.com>.

* VMS-specific changes:

  * John W. Eaton has updated the VMS port to support libraries and VPATH.

  * The cd command is supported if it's called as $(CD). This invokes
    the 'builtin_cd' command which changes the directory.
    Calling 'set def' doesn't do the trick, since a sub-shell is
    spawned for this command, the directory is changed *in this sub-shell*
    and the sub-shell ends.

  * Libraries are not supported. They were in GNU Make 3.60 but somehow I
    didn't care porting the code. If there is enough interest, I'll do it at
    some later time.

  * The variable $^ separates files with commas instead of spaces (It's the
    natural thing to do for VMS).

  * See defaults.c for VMS default suffixes and my definitions for default
    rules and variables.

  * The shell function is not implemented yet.

  * Load average routines haven't been implemented for VMS yet.

  * The default include directory for including other makefiles is
    SYS$SYSROOT:[SYSLIB] (I don't remember why I didn't just use
    SYS$LIBRARY: instead; maybe it wouldn't work that way).

  * The default makefiles make looks for are: makefile.vms, gnumakefile,
    makefile., and gnumakefile. .

  * The stat() function and handling of time stamps in VMS is broken, so I
    replaced it with a hack in vmsfunctions.c. I will provide a full rewrite
    somewhere in the future. Be warned, the time resolution inside make is
    less than what vms provides. This might be a problem on the faster Alphas.

  * You can use a : in a filename only if you precede it with a backslash ('\').
    E.g.- hobbes\:[bogas.files]

  * Make ignores success, informational, or warning errors (-S-, -I-, or -W-).
    But it will stop on -E- and -F- errors. (unless you do something
    to override this in your makefile, or whatever).

  * Remote stuff isn't implemented yet.

  * Multiple line DCL commands, such as "if" statements, must be put inside
    command files.  You can run a command file by using \@.

Version 3.75 (27 Aug 1996)

* The directory messages printed by `-w' and implicitly in sub-makes,
  are now omitted if Make runs no commands and has no other messages to print.

* Make now detects files that for whatever reason have modification times
  in the future and gives an error.  Files with such impossible timestamps
  can result from unsynchronized clocks, or archived distributions
  containing bogus timestamps; they confuse Make's dependency engine
  thoroughly.

* The new directive `sinclude' is now recognized as another name for
  `-include', for compatibility with some other Makes.

* Aaron Digulla has contributed a port to AmigaDOS.  See README.Amiga for
  details, and direct all Amiga-related questions to <digulla@fh-konstanz.de>.

* Rob Tulloh of Tivoli Systems has contributed a port to Windows NT or 95.
  See README.W32 for details, and direct all Windows-related questions to
  <rob_tulloh@tivoli.com>.

* VMS-specific changes:

  * Lots of default settings are adapted for VMS. See default.c.

  * Long command lines are now converted to command files.

  * Comma (',') as a separator is now allowed. See makefile.vms for an example.

Version 3.73 (05 Apr 1995)

* Converted to use Autoconf version 2, so `configure' has some new options.
  See INSTALL for details.

* You can now send a SIGUSR1 signal to Make to toggle printing of debugging
  output enabled by -d, at any time during the run.

Version 3.72 (04 Nov 1994)

* DJ Delorie has ported Make to MS-DOS using the GO32 extender.
  He is maintaining the DOS port, not the GNU Make maintainer;
  please direct bugs and questions for DOS to <djgpp@sun.soe.clarkson.edu>.
  MS-DOS binaries are available for FTP from ftp.simtel.net in
  /pub/simtelnet/gnu/djgpp/.

* The `MAKEFLAGS' variable (in the environment or in a makefile) can now
  contain variable definitions itself; these are treated just like
  command line variable definitions.  Make will automatically insert any
  variable definitions from the environment value of `MAKEFLAGS' or from
  the command line, into the `MAKEFLAGS' value exported to children.  The
  `MAKEOVERRIDES' variable previously included in the value of `$(MAKE)'
  for sub-makes is now included in `MAKEFLAGS' instead.  As before, you can
  reset `MAKEOVERRIDES' in your makefile to avoid putting all the variables
  in the environment when its size is limited.

* If `.DELETE_ON_ERROR' appears as a target, Make will delete the target of
  a rule if it has changed when its recipe exits with a nonzero status,
  just as when the recipe gets a signal.

* The automatic variable `$+' is new.  It lists all the dependencies like
  `$^', but preserves duplicates listed in the makefile.  This is useful
  for linking rules, where library files sometimes need to be listed twice
  in the link order.

* You can now specify the `.IGNORE' and `.SILENT' special targets with
  dependencies to limit their effects to those files.  If a file appears as
  a dependency of `.IGNORE', then errors will be ignored while running the
  recipe to update that file.  Likewise if a file appears as a dependency
  of `.SILENT', then the recipe to update that file will not be printed
  before it is run.  (This change was made to conform to POSIX.2.)

Version 3.71 (21 May 1994)

* The automatic variables `$(@D)', `$(%D)', `$(*D)', `$(<D)', `$(?D)', and
  `$(^D)' now omit the trailing slash from the directory name.  (This change
  was made to comply with POSIX.2.)

* The source distribution now includes the Info files for the Make manual.
  There is no longer a separate distribution containing Info and DVI files.

* You can now set the variables `binprefix' and/or `manprefix' in
  Makefile.in (or on the command line when installing) to install GNU Make
  under a name other than `make' (i.e., ``make binprefix=g install''
  installs GNU Make as `gmake').

* The built-in Texinfo rules use the new variables `TEXI2DVI_FLAGS' for
  flags to the `texi2dvi' script, and `MAKEINFO_FLAGS' for flags to the
  Makeinfo program.

* The exit status of Make when it runs into errors is now 2 instead of 1.
  The exit status is 1 only when using -q and some target is not up to date.
  (This change was made to comply with POSIX.2.)

Version 3.70 (03 Jan 1994)

* It is no longer a fatal error to have a NUL character in a makefile.
  You should never put a NUL in a makefile because it can have strange
  results, but otherwise empty lines full of NULs (such as produced by
  the `xmkmf' program) will always work fine.

* The error messages for nonexistent included makefiles now refer to the
  makefile name and line number where the `include' appeared, so Emacs's
  C-x ` command takes you there (in case it's a typo you need to fix).

Version 3.69 (07 Nov 1993)

* Implicit rule search for archive member references is now done in the
  opposite order from previous versions: the whole target name `LIB(MEM)'
  first, and just the member name and parentheses `(MEM)' second.

* Make now gives an error for an unterminated variable or function reference.
  For example, `$(foo' with no matching `)' or `${bar' with no matching `}'.

* The new default variable `MAKE_VERSION' gives the version number of
  Make, and a string describing the remote job support compiled in (if any).
  Thus the value (in this release) is something like `3.69' or `3.69-Customs'.

* Commands in an invocation of the `shell' function are no longer run
  with a modified environment like recipes are.  As in versions before
  3.68, they now run with the environment that `make' started with.  We
  have reversed the change made in version 3.68 because it turned out to
  cause a paradoxical situation in cases like:

        export variable = $(shell echo value)

  When Make attempted to put this variable in the environment for a
  recipe, it would try expand the value by running the shell command
  `echo value'.  In version 3.68, because it constructed an environment
  for that shell command in the same way, Make would begin to go into an
  infinite loop and then get a fatal error when it detected the loop.

* The recipe given for `.DEFAULT' is now used for phony targets with no
  recipe.

Version 3.68 (28 Jul 1993)

* You can list several archive member names inside parenthesis:
  `lib(mem1 mem2 mem3)' is equivalent to `lib(mem1) lib(mem2) lib(mem3)'.

* You can use wildcards inside archive member references.  For example,
  `lib(*.o)' expands to all existing members of `lib' whose names end in
  `.o' (e.g. `lib(a.o) lib(b.o)'); `*.a(*.o)' expands to all such members
  of all existing files whose names end in `.a' (e.g. `foo.a(a.o)
  foo.a(b.o) bar.a(c.o) bar.a(d.o)'.

* A suffix rule `.X.a' now produces two pattern rules:
        (%.o): %.X	# Previous versions produced only this.
        %.a: %.X	# Now produces this as well, just like other suffixes.

* The new flag `--warn-undefined-variables' says to issue a warning message
  whenever Make expands a reference to an undefined variable.

* The new `-include' directive is just like `include' except that there is
  no error (not even a warning) for a nonexistent makefile.

* Commands in an invocation of the `shell' function are now run with a
  modified environment like recipes are, so you can use `export' et al
  to set up variables for them.  They used to run with the environment
  that `make' started with.

Version 3.66 (21 May 1993)

* `make --version' (or `make -v') now exits immediately after printing
  the version number.

Version 3.65 (09 May 1993)

* Make now supports long-named members in `ar' archive files.

Version 3.64 (21 Apr 1993)

* Make now supports the `+=' syntax for a variable definition which appends
  to the variable's previous value.  See the section `Appending More Text
  to Variables' in the manual for full details.

* The new option `--no-print-directory' inhibits the `-w' or
  `--print-directory' feature.  Make turns on `--print-directory'
  automatically if you use `-C' or `--directory', and in sub-makes; some
  users have found this behavior undesirable.

* The built-in implicit rules now support the alternative extension
  `.txinfo' for Texinfo files, just like `.texinfo' and `.texi'.

Version 3.63 (22 Jan 1993)

* Make now uses a standard GNU `configure' script.  See the new file
  INSTALL for the new (and much simpler) installation procedure.

* There is now a shell script to build Make the first time, if you have no
  other `make' program.  `build.sh' is created by `configure'; see README.

* GNU Make now completely conforms to the POSIX.2 specification for `make'.

* Elements of the `$^' and `$?' automatic variables that are archive
  member references now list only the member name, as in Unix and POSIX.2.

* You should no longer ever need to specify the `-w' switch, which prints
  the current directory before and after Make runs.  The `-C' switch to
  change directory, and recursive use of Make, now set `-w' automatically.

* Multiple double-colon rules for the same target will no longer have their
  recipes run simultaneously under -j, as this could result in the two
  recipes trying to change the file at the same time and interfering with
  one another.

* The `SHELL' variable is now never taken from the environment.
  Each makefile that wants a shell other than the default (/bin/sh) must
  set SHELL itself.  SHELL is always exported to child processes.
  This change was made for compatibility with POSIX.2.

* Make now accepts long options.  There is now an informative usage message
  that tells you what all the options are and what they do.  Try `make --help'.

* There are two new directives: `export' and `unexport'.  All variables are
  no longer automatically put into the environments of the recipe lines that
  Make runs.  Instead, only variables specified on the command line or in
  the environment are exported by default.  To export others, use:
        export VARIABLE
  or you can define variables with:
        export VARIABLE = VALUE
  or:
        export VARIABLE := VALUE
  You can use just:
        export
  or:
        .EXPORT_ALL_VARIABLES:
  to get the old behavior.  See the node `Variables/Recursion' in the manual
  for a full description.

* The recipe from the `.DEFAULT' special target is only applied to
  targets which have no rules at all, not all targets with no recipe.
  This change was made for compatibility with Unix make.

* All fatal error messages now contain `***', so they are easy to find in
  compilation logs.

* Dependency file names like `-lNAME' are now replaced with the actual file
  name found, as with files found by normal directory search (VPATH).
  The library file `libNAME.a' may now be found in the current directory,
  which is checked before VPATH; the standard set of directories (/lib,
  /usr/lib, /usr/local/lib) is now checked last.
  See the node `Libraries/Search' in the manual for full details.

* A single `include' directive can now specify more than one makefile to
  include, like this:
        include file1 file2
  You can also use shell file name patterns in an `include' directive:
        include *.mk

* The default directories to search for included makefiles, and for
  libraries specified with `-lNAME', are now set by configuration.

* You can now use blanks as well as colons to separate the directories in a
  search path for the `vpath' directive or the `VPATH' variable.

* You can now use variables and functions in the left hand side of a
  variable assignment, as in "$(foo)bar = value".

* The `MAKE' variable is always defined as `$(MAKE_COMMAND) $(MAKEOVERRIDES)'.
  The `MAKE_COMMAND' variable is now defined to the name with which make
  was invoked.

* The built-in rules for C++ compilation now use the variables `$(CXX)' and
  `$(CXXFLAGS)' instead of `$(C++)' and `$(C++FLAGS)'.  The old names had
  problems with shells that cannot have `+' in environment variable names.

* The value of a recursively expanded variable is now expanded when putting
  it into the environment for child processes.  This change was made for
  compatibility with Unix make.

* A rule with no targets before the `:' is now accepted and ignored.
  This change was made for compatibility with SunOS 4 make.
  We do not recommend that you write your makefiles to take advantage of this.

* The `-I' switch can now be used in MAKEFLAGS, and are put there
  automatically just like other switches.

Version 3.61

* Built-in rules for C++ source files with the `.C' suffix.
  We still recommend that you use `.cc' instead.

* If a recipe is given too many times for a single target, the last one
  given is used, and a warning message is printed.

* Error messages about makefiles are in standard GNU error format,
  so C-x ` in Emacs works on them.

* Dependencies of pattern rules which contain no % need not actually exist
  if they can be created (just like dependencies which do have a %).

Version 3.60

* A message is always printed when Make decides there is nothing to be done.
  It used to be that no message was printed for top-level phony targets
  (because "`phony' is up to date" isn't quite right).  Now a different
  message "Nothing to be done for `phony'" is printed in that case.

* Archives on AIX now supposedly work.

* When the recipes specified for .DEFAULT are used to update a target,
  the $< automatic variable is given the same value as $@ for that target.
  This is how Unix make behaves, and this behavior is mandated by POSIX.2.

Version 3.59

* The -n, -q, and -t options are not put in the `MAKEFLAGS' and `MFLAG'
  variables while remaking makefiles, so recursive makes done while remaking
  makefiles will behave properly.

* If the special target `.NOEXPORT' is specified in a makefile,
  only variables that came from the environment and variables
  defined on the command line are exported.

Version 3.58

* Suffix rules may have dependencies (which are ignored).

Version 3.57

* Dependencies of the form `-lLIB' are searched for as /usr/local/lib/libLIB.a
  as well as libLIB.a in /usr/lib, /lib, the current directory, and VPATH.

Version 3.55

* There is now a Unix man page for GNU Make.  It is certainly not a
  replacement for the Texinfo manual, but it documents the basic
  functionality and the switches.  For full documentation, you should
  still read the Texinfo manual.  Thanks to Dennis Morse of Stanford
  University for contributing the initial version of this.

* Variables which are defined by default (e.g., `CC') will no longer be
  put into the environment for child processes.  (If these variables are
  reset by the environment, makefiles, or the command line, they will
  still go into the environment.)

* Makefiles which have recipes but no dependencies (and thus are always
  considered out of date and in need of remaking), will not be remade (if they
  were being remade only because they were makefiles).  This means that GNU
  Make will no longer go into an infinite loop when fed the makefiles that
  `imake' (necessary to build X Windows) produces.

* There is no longer a warning for using the `vpath' directive with an explicit
pathname (instead of a `%' pattern).

Version 3.51

* When removing intermediate files, only one `rm' command line is printed,
  listing all file names.

* There are now automatic variables `$(^D)', `$(^F)', `$(?D)', and `$(?F)'.
  These are the directory-only and file-only versions of `$^' and `$?'.

* Library dependencies given as `-lNAME' will use "libNAME.a" in the current
  directory if it exists.

* The automatic variable `$($/)' is no longer defined.

* Leading `+' characters on a recipe line make that line be executed even
  under -n, -t, or -q (as if the line contained `$(MAKE)').

* For recipe lines containing `$(MAKE)', `${MAKE}', or leading `+' characters,
  only those lines are executed, not the entire recipe.
  (This is how Unix make behaves for lines containing `$(MAKE)' or `${MAKE}'.)

Version 3.50

* Filenames in rules will now have ~ and ~USER expanded.

* The `-p' output has been changed so it can be used as a makefile.
  (All information that isn't specified by makefiles is prefaced with comment
  characters.)

Version 3.49

* The % character can be quoted with backslash in implicit pattern rules,
  static pattern rules, `vpath' directives, and `patsubst', `filter', and
  `filter-out' functions.  A warning is issued if a `vpath' directive's
  pattern contains no %.

* The `wildcard' variable expansion function now expands ~ and ~USER.

* Messages indicating failed recipe lines now contain the target name:
        make: *** [target] Error 1

* The `-p' output format has been changed somewhat to look more like
  makefile rules and to give all information that Make has about files.

Version 3.48

Version 3.47

* The `-l' switch with no argument removes any previous load-average limit.

* When the `-w' switch is in effect, and Make has updated makefiles,
  it will write a `Leaving directory' message before re-executing itself.
  This makes the `directory change tracking' changes to Emacs's compilation
  commands work properly.

Version 3.46

* The automatic variable `$*' is now defined for explicit rules,
  as it is in Unix make.

Version 3.45

* The `-j' switch is now put in the MAKEFLAGS and MFLAGS variables when
  specified without an argument (indicating infinite jobs).
  The `-l' switch is not always put in the MAKEFLAGS and MFLAGS variables.

* Make no longer checks hashed directories after running recipes.
  The behavior implemented in 3.41 caused too much slowdown.

Version 3.44

* A dependency is NOT considered newer than its dependent if
  they have the same modification time.  The behavior implemented
  in 3.43 conflicts with RCS.

Version 3.43

* Dependency loops are no longer fatal errors.

* A dependency is considered newer than its dependent if
  they have the same modification time.

Version 3.42

* The variables F77 and F77FLAGS are now set by default to $(FC) and
  $(FFLAGS).  Makefiles designed for System V make may use these variables in
  explicit rules and expect them to be set.  Unfortunately, there is no way to
  make setting these affect the Fortran implicit rules unless FC and FFLAGS
  are not used (and these are used by BSD make).

Version 3.41

* Make now checks to see if its hashed directories are changed by recipes.
  Other makes that hash directories (Sun, 4.3 BSD) don't do this.

Version 3.39

* The `shell' function no longer captures standard error output.

Version 3.32

* A file beginning with a dot can be the default target if it also contains
  a slash (e.g., `../bin/foo').  (Unix make allows this as well.)

Version 3.31

* Archive member names are truncated to 15 characters.

* Yet more USG stuff.

* Minimal support for Microport System V (a 16-bit machine and a
  brain-damaged compiler).  This has even lower priority than other USG
  support, so if it gets beyond trivial, I will take it out completely.

* Revamped default implicit rules (not much visible change).

* The -d and -p options can come from the environment.

Version 3.30

* Improved support for USG and HPUX (hopefully).

* A variable reference like `$(foo:a=b)', if `a' contains a `%', is
  equivalent to `$(patsubst a,b,$(foo))'.

* Defining .DEFAULT with no deps or recipe clears its recipe.

* New default implicit rules for .S (cpp, then as), and .sh (copy and
  make executable).  All default implicit rules that use cpp (even
  indirectly), use $(CPPFLAGS).

Version 3.29

* Giving the -j option with no arguments gives you infinite jobs.

Version 3.28

* New option: "-l LOAD" says not to start any new jobs while others are
  running if the load average is not below LOAD (a floating-point number).

* There is support in place for implementations of remote command execution
  in Make.  See the file remote.c.

Version 3.26

* No more than 10 directories will be kept open at once.
  (This number can be changed by redefining MAX_OPEN_DIRECTORIES in dir.c.)

Version 3.25

* Archive files will have their modification times recorded before doing
  anything that might change their modification times by updating an archive
  member.

Version 3.20

* The `MAKELEVEL' variable is defined for use by makefiles.

Version 3.19

* The recursion level indications in error messages are much shorter than
  they were in version 3.14.

Version 3.18

* Leading spaces before directives are ignored (as documented).

* Included makefiles can determine the default goal target.
  (System V Make does it this way, so we are being compatible).

Version 3.14.

* Variables that are defaults built into Make will not be put in the
  environment for children.  This just saves some environment space and,
  except under -e, will be transparent to sub-makes.

* Error messages from sub-makes will indicate the level of recursion.

* Hopefully some speed-up for large directories due to a change in the
  directory hashing scheme.

* One child will always get a standard input that is usable.

* Default makefiles that don't exist will be remade and read in.

Version 3.13.

* Count parentheses inside expansion function calls so you can
  have nested calls: `$(sort $(foreach x,a b,$(x)))'.

Version 3.12.

* Several bug fixes, including USG and Sun386i support.

* `shell' function to expand shell commands a la `

* If the `-d' flag is given, version information will be printed.

* The `-c' option has been renamed to `-C' for compatibility with tar.

* The `-p' option no longer inhibits other normal operation.

* Makefiles will be updated and re-read if necessary.

* Can now run several recipes at once (parallelism), -j option.

* Error messages will contain the level of Make recursion, if any.

* The `MAKEFLAGS' and `MFLAGS' variables will be scanned for options after
  makefiles are read.

* A double-colon rule with no dependencies will always have its recipe run.
  (This is how both the BSD and System V versions of Make do it.)

Version 3.05

(Changes from versions 1 through 3.05 were never recorded.  Sorry.)

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