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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: mesonbuild/meson#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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