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* doc/make.texi (Parallel Disable): Add clarifications.

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* NEWS: Suggest how to change makefiles that use $(MAKEFLAGS).
This commit is contained in:
Paul Smith 2022-09-13 18:22:29 -04:00
parent f6ea899d83
commit 88d126d6c4
2 changed files with 9 additions and 6 deletions
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6
NEWS
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@ -30,8 +30,10 @@ https://sv.gnu.org/bugs/index.php?group=make&report_id=111&fix_release_id=109&se
* WARNING: Backward-incompatibility!
Previously only simple (one-letter) options were added to the MAKEFLAGS
variable that was visible while parsing makefiles. Now, all options
are available in MAKEFLAGS.
variable that was visible while parsing makefiles. Now, all options are
available in MAKEFLAGS. If you want to check MAKEFLAGS for a one-letter
option, expanding "$(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

9
doc/make.texi
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@ -4478,12 +4478,13 @@ If parallel execution is enabled, @code{make} will try to build @file{one} and
@file{two} in parallel but will not try to build @file{three} until both are
complete.
As with targets provided to @code{.NOTPARALLEL}, @code{.WAIT} has an effect
As with targets provided to @code{.NOTPARALLEL}, @code{.WAIT} takes effect
only when building the target in whose prerequisite list it appears. If the
same prerequisites are present in other targets, without @code{.WAIT}, then
they may still be run in parallel. Because of this, @code{.WAIT} is an
unreliable way to impose ordering than defining a prerequisite relationship.
However it is easy to use and may suffice for simple needs.
they may still be run in parallel. Because of this, neither
@code{.NOTPARALLEL} with targets nor @code{.WAIT} are as reliable for
controlling parallel execution as defining a prerequisite relationship.
However they are easy to use and may be sufficient in less complex situations.
The @code{.WAIT} prerequisite will not be present in any of the automatic
variables for the rule.