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util: Use meson checks for valloc() and memalign() presence

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Instead of assuming that all CONFIG_BSD have valloc() and anything
else is memalign(), explicitly check for those functions in
meson.build and use the "is the function present" define.  Tests for
specific functionality are better than which-OS checks; this also
lets us give a helpful error message if somehow there's no usable
function present.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-id: 20220226180723.1706285-8-peter.maydell@linaro.org
This commit is contained in:
Peter Maydell 2022-02-26 18:07:21 +00:00
parent 5c8c714a0a
commit 88454f844e
2 changed files with 6 additions and 2 deletions
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2
meson.build
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@ -1623,6 +1623,8 @@ config_host_data.set('CONFIG_POSIX_FALLOCATE', cc.has_function('posix_fallocate'
# 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_ALIGNED_MALLOC', cc.has_function('_aligned_malloc'))
config_host_data.set('CONFIG_VALLOC', cc.has_function('valloc'))
config_host_data.set('CONFIG_MEMALIGN', cc.has_function('memalign'))
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))

6
util/memalign.c
View File

@ -56,10 +56,12 @@ void *qemu_try_memalign(size_t alignment, size_t size)
}
#elif defined(CONFIG_ALIGNED_MALLOC)
ptr = _aligned_malloc(size, alignment);
#elif defined(CONFIG_BSD)
#elif defined(CONFIG_VALLOC)
ptr = valloc(size);
#else
#elif defined(CONFIG_MEMALIGN)
ptr = memalign(alignment, size);
#else
#error No function to allocate aligned memory available
#endif
trace_qemu_memalign(alignment, size, ptr);
return ptr;