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meson.build: Don't misdetect posix_memalign() on Windows 

Currently we incorrectly think that posix_memalign() exists on
Windows.  This is because of a combination of:

 * the msys2/mingw toolchain/libc claim to have a
   __builtin_posix_memalign when there isn't a builtin of that name
 * meson will assume that if you have a __builtin_foo that
   counts for has_function('foo')

Specifying a specific include file via prefix: causes meson to not
treat builtins as sufficient and actually look for the function
itself; see this meson pull request which added that as the official
way to get the right answer:
  https://github.com/mesonbuild/meson/pull/1150

Currently this misdectection doesn't cause problems because we only
use CONFIG_POSIX_MEMALIGN in oslib-posix.c; however that will change
in a following commit.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20220226180723.1706285-6-peter.maydell@linaro.org
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
master
Peter Maydell 2022-02-26 18:07:19 +00:00
parent bc0fecc1c2
commit 8698343b86
1 changed files with 3 additions and 1 deletions
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@ -1619,7 +1619,9 @@ config_host_data.set('CONFIG_CLOCK_ADJTIME', cc.has_function('clock_adjtime'))
config_host_data.set('CONFIG_DUP3', cc.has_function('dup3'))
config_host_data.set('CONFIG_FALLOCATE', cc.has_function('fallocate'))
config_host_data.set('CONFIG_POSIX_FALLOCATE', cc.has_function('posix_fallocate'))
config_host_data.set('CONFIG_POSIX_MEMALIGN', cc.has_function('posix_memalign'))
# Note that we need to specify prefix: here to avoid incorrectly
# thinking that Windows has posix_memalign()
config_host_data.set('CONFIG_POSIX_MEMALIGN', cc.has_function('posix_memalign', prefix: '#include <stdlib.h>'))
config_host_data.set('CONFIG_PPOLL', cc.has_function('ppoll'))
config_host_data.set('CONFIG_PREADV', cc.has_function('preadv', prefix: '#include <sys/uio.h>'))
config_host_data.set('CONFIG_SEM_TIMEDWAIT', cc.has_function('sem_timedwait', dependencies: threads))