bug#51925: [Trunk][macOS] "vfork" is deprecated

[Jacob Faibussowitsch <jacob.fai@gmail.com>]

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Checking my config.log gives:

configure:20626: checking for posix_spawn
configure:20626: clang -o conftest -O3 -march=native -mtune=native -flto=thin -flto-jobs=5 -std=gnu\
17 -Wno-unused-command-line-argument -Wno-unknown-pragmas     conftest.c  -lpng -ljpeg >&5
configure:20626: $? = 0
configure:20626: result: yes
configure:20632: checking for posix_spawn_file_actions_addchdir
configure:20632: clang -o conftest -O3 -march=native -mtune=native -flto=thin -flto-jobs=5 -std=gnu\
17 -Wno-unused-command-line-argument -Wno-unknown-pragmas     conftest.c  -lpng -ljpeg >&5
undef: _posix_spawn_file_actions_addchdir
Undefined symbols for architecture x86_64:
  "_posix_spawn_file_actions_addchdir", referenced from:
      _main in 0.x86_64.thinlto.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

And the final set of defines for configure includes the following:

...
#define HAVE_POSIX_SPAWN 1
#define HAVE_POSIX_SPAWN_FILE_ACTIONS_ADDCHDIR_NP 1
#define HAVE_POSIX_SPAWNATTR_SETFLAGS 1
#define HAVE_DECL_POSIX_SPAWN_SETSID 1
...
configure: exit 0

Best regards,

Jacob Faibussowitsch
(Jacob Fai - booss - oh - vitch)

> On Nov 17, 2021, at 11:58, Eli Zaretskii <eliz@gnu.org> wrote:
> 
>> From: Jacob Faibussowitsch <jacob.fai@gmail.com>
>> Date: Wed, 17 Nov 2021 11:50:46 -0600
>> 
>> This is by no means breaking or disrupting anything on my end (at least that I can tell), but I did notice in
>> some commit messages a few weeks that someone was attempting to replace vfork with posix_spawn
>> specifically on macOS, so maybe my system is some unhandled corner-case?
> 
> That change is already on master.  If your build of a recent master
> branch doesn't use the posix_spawn code, the first place to look is in
> config.log, where you should try to find the reason(s) why the
> configure script decided your system doesn't have posix_spawn.
> 
> Thanks.


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