Correctly detect posix_spawn_file_actions_addchdir[_np]#326
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bgamari merged 1 commit intohaskell:masterfrom Sep 23, 2024
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…l#303) It appears that CPP macro names are case sensitive, and the code was previously checking for HAVE_posix_spawn_file_actions_addchdir whereas Autoconf defines HAVE_POSIX_SPAWN_FILE_ACTIONS_ADDCHDIR. This meant that calls to createProcess which set cwd to a Just value would always fail to use posix_spawn and instead fall back on fork, which is problematic when the parent process has a large residency. Testing the fix revealed another issue, which is that _GNU_SOURCE must be defined before any glibc headers are included, otherwise the _np variant provided by glibc will not be declared.
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Fixes #303. The previous fix in #304 unfortunately didn't resolve the issue, but I've tested with
stracethat this patch results in the right syscall.It appears that CPP macro names are case sensitive, and the code was previously checking for
HAVE_posix_spawn_file_actions_addchdirwhereas Autoconf definesHAVE_POSIX_SPAWN_FILE_ACTIONS_ADDCHDIR. This meant that calls tocreateProcesswhich setcwdto aJustvalue would always fail to useposix_spawnand instead fall back onfork, which is problematic when the parent process has a large residency.Testing the fix revealed another issue, which is that
_GNU_SOURCEmust be defined before any glibc headers are included, otherwise the_npvariant provided by glibc will not be declared.