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[SV 48643] Update the implicit rule search docs

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* NEWS: Announce the change.
* doc/make.texi (Implicit Rule Search): Update the definition of
"ought to exist" and add the extra step for compatibility mode.
This commit is contained in:
Paul Smith 2021-11-27 21:57:37 -05:00
parent 21d3865973
commit 3ecf97d3af
2 changed files with 17 additions and 2 deletions

8
NEWS
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@ -78,6 +78,14 @@ https://sv.gnu.org/bugs/index.php?group=make&report_id=111&fix_release_id=109&se
made as a side-effect of some other target's recipe are now noticed as
expected.
* 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".
* GNU Make can now be built for MS-Windows using the Tiny C tcc compiler.
Port provided by Christian Jullien <eligis@orange.fr>

11
doc/make.texi
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@ -27,7 +27,7 @@ of @cite{The GNU Make Manual}, for GNU @code{make} version @value{VERSION}.
Copyright @copyright{} 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995,
1996, 1997, 1998, 1999, 2000, 2002, 2003, 2004, 2005, 2006, 2007,
2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019,
2020 Free Software Foundation, Inc.
2020, 2021 Free Software Foundation, Inc.
@quotation
Permission is granted to copy, distribute and/or modify this document
@ -10964,7 +10964,7 @@ the front of each prerequisite name.@refill
@item
Test whether all the prerequisites exist or ought to exist. (If a
file name is mentioned in the makefile as a target or as an explicit
prerequisite, then we say it ought to exist.)
prerequisite of target T, then we say it ought to exist.)
If all prerequisites exist or ought to exist, or there are no prerequisites,
then this rule applies.
@ -10994,6 +10994,13 @@ If all prerequisites exist, ought to exist, or can be
made by implicit rules, then this rule applies.
@end enumerate
@item
If no pattern rule has been found then try step 5 and step 6 again with a
modified definition of ``ought to exist'': if a filename is mentioned as a
target or as an explicit prerequisite of @emph{any} target, then it ought to
exist. This check is only present for backward-compatibility with older
versions of GNU make: we don't recommend relying on it.
@item
If no implicit rule applies, the rule for @code{.DEFAULT}, if any,
applies. In that case, give @var{t} the same recipe that