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meson: Don't even detect posix_madvise() on Darwin 

On Darwin, posix_madvise() has the same return semantics as plain
madvise() [1]. That's not really what our usage expects.
Fortunately, madvise() is available and preferred anyways so we
may stop detecting posix_madvise() on Darwin.

1: https://opensource.apple.com/source/xnu/xnu-7195.81.3/bsd/man/man2/madvise.2.auto.html

Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Message-ID: <00f71753bdeb8c0f049fda05fb63b84bb5502fb3.1717584048.git.mprivozn@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Michal Privoznik 2024-06-05 12:44:54 +02:00 committed by Paolo Bonzini
parent 75dbebddb6
commit 12d7d0c249
1 changed files with 10 additions and 4 deletions
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14
meson.build
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@ -2556,10 +2556,16 @@ config_host_data.set('CONFIG_OPEN_BY_HANDLE', cc.links(gnu_source_prefix + '''
#else
int main(void) { struct file_handle fh; return open_by_handle_at(0, &fh, 0); }
#endif'''))
config_host_data.set('CONFIG_POSIX_MADVISE', cc.links(gnu_source_prefix + '''
#include <sys/mman.h>
#include <stddef.h>
int main(void) { return posix_madvise(NULL, 0, POSIX_MADV_DONTNEED); }'''))
# On Darwin posix_madvise() has the same return semantics as plain madvise(),
# i.e. errno is set and -1 is returned. That's not really how POSIX defines the
# function. On the flip side, it has madvise() which is preferred anyways.
if host_os != 'darwin'
config_host_data.set('CONFIG_POSIX_MADVISE', cc.links(gnu_source_prefix + '''
#include <sys/mman.h>
#include <stddef.h>
int main(void) { return posix_madvise(NULL, 0, POSIX_MADV_DONTNEED); }'''))
endif
config_host_data.set('CONFIG_PTHREAD_SETNAME_NP_W_TID', cc.links(gnu_source_prefix + '''
#include <pthread.h>