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* doc/make.texi (Environment): [SV 60841] Clarify variable exporting.

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Paul Smith 2021-09-06 10:57:43 -04:00
parent b2e898d0bf
commit 214df0e92a
1 changed files with 7 additions and 8 deletions
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doc/make.texi
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@ -6278,14 +6278,13 @@ because you know that no makefile will use them for other things. (Note
this is not totally reliable; some makefiles set @code{CFLAGS} explicitly
and therefore are not affected by the value in the environment.)
When @code{make} runs a recipe, variables defined in the
makefile are placed into the environment of each shell. This allows
you to pass values to sub-@code{make} invocations (@pxref{Recursion,
,Recursive Use of @code{make}}). By default, only variables that came
from the environment or the command line are passed to recursive
invocations. You can use the @code{export} directive to pass other
variables. @xref{Variables/Recursion, , Communicating Variables to a
Sub-@code{make}}, for full details.
When @code{make} runs a recipe, some variables defined in the makefile
are placed into the environment of each command @code{make} invokes.
By default, only variables that came from the @code{make}'s
environment or set on its command line are placed into the environment
of the commands. You can use the @code{export} directive to pass
other variables. @xref{Variables/Recursion, , Communicating Variables
to a Sub-@code{make}}, for full details.
Other use of variables from the environment is not recommended. It is not
wise for makefiles to depend for their functioning on environment variables