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Detect FreeBSD versions with broken MSG_CMSG_CLOEXEC

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If we are compiling against a version of FreeBSD where MSG_CMSG_CLOEXEC
does not work, use the fallback directly. This was only fixed recently
(in https://cgit.freebsd.org/src/commit/?id=6ceacebdf52211).

Signed-off-by: Alex Richardson <Alexander.Richardson@cl.cam.ac.uk>
This commit is contained in:
Alex Richardson 2021-03-19 10:02:41 +00:00 • committed by Alexander Richardson
parent 42bf011f65
commit 382f368a27
3 changed files with 33 additions and 1 deletions
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16
meson.build
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@ -43,6 +43,22 @@ foreach f: have_funcs
config_h.set('HAVE_' + f.underscorify().to_upper(), cc.has_function(f))
endforeach
config_h.set10('HAVE_XUCRED_CR_PID', cc.has_member('struct xucred', 'cr_pid', prefix : '#include <sys/ucred.h>'))
have_broken_msg_cmsg_cloexec = false
if host_machine.system() == 'freebsd'
have_broken_msg_cmsg_cloexec = not cc.compiles('''
#include <sys/param.h> /* To get __FreeBSD_version. */
#if __FreeBSD_version < 1300502 || \
(__FreeBSD_version >= 1400000 && __FreeBSD_version < 1400006)
/*
* FreeBSD had a broken implementation of MSG_CMSG_CLOEXEC between 2015 and
* 2021. Check if we are compiling against a version that includes the fix
* (https://cgit.freebsd.org/src/commit/?id=6ceacebdf52211).
*/
#error "Broken MSG_CMSG_CLOEXEC"
#endif
''', name : 'MSG_CMSG_CLOEXEC works correctly')
endif
config_h.set10('HAVE_BROKEN_MSG_CMSG_CLOEXEC', have_broken_msg_cmsg_cloexec)
if get_option('libraries')
if host_machine.system() == 'freebsd'