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>
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@ -1619,7 +1619,9 @@ config_host_data.set('CONFIG_CLOCK_ADJTIME', cc.has_function('clock_adjtime'))
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config_host_data.set('CONFIG_DUP3', cc.has_function('dup3'))
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config_host_data.set('CONFIG_FALLOCATE', cc.has_function('fallocate'))
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config_host_data.set('CONFIG_POSIX_FALLOCATE', cc.has_function('posix_fallocate'))
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config_host_data.set('CONFIG_POSIX_MEMALIGN', cc.has_function('posix_memalign'))
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# Note that we need to specify prefix: here to avoid incorrectly
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# thinking that Windows has posix_memalign()
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config_host_data.set('CONFIG_POSIX_MEMALIGN', cc.has_function('posix_memalign', prefix: '#include <stdlib.h>'))
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config_host_data.set('CONFIG_PPOLL', cc.has_function('ppoll'))
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config_host_data.set('CONFIG_PREADV', cc.has_function('preadv', prefix: '#include <sys/uio.h>'))
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config_host_data.set('CONFIG_SEM_TIMEDWAIT', cc.has_function('sem_timedwait', dependencies: threads))
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