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meson: Don't misdetect stpcpy on windows platforms on clang

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See https://github.com/mesonbuild/meson/issues/3672 and
https://github.com/mesonbuild/meson/issues/5628 for explanations
of cases where meson misdetects functions due to clang builtins (that
always are available, regardless of whether the platform actually
provides them).

The same also happens on GCC 10, which added support for __has_builtin.
This commit is contained in:
Martin Storsjö 2020-03-31 23:54:17 +03:00 committed by Philip Withnall
parent c49ee9efbd
commit 3c5512222c
1 changed files with 13 additions and 3 deletions
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@ -532,13 +532,23 @@ foreach f : functions
endif
endforeach
# Check that stpcpy() is usable; must use header
if cc.has_function('stpcpy', prefix : '#include <string.h>')
# Check that stpcpy() is usable; must use header.
# cc.has_function() in some cases (clang, gcc 10+) assumes that if the
# compiler provides a builtin of the same name that the function exists, while
# it's in fact not provided by any header or library. This is true for
# stpcpy() on Windows using clang and gcc as well as posix_memalign() using
# gcc on Windows. Skip these checks on Windows for now to avoid false
# positives. See https://github.com/mesonbuild/meson/pull/7116,
# https://github.com/mesonbuild/meson/issues/3672 and
# https://github.com/mesonbuild/meson/issues/5628.
# FIXME: Once meson no longer returns success for stpcpy() and
# posix_memalign() on Windows using GCC and clang we can remove this.
if host_system != 'windows' and cc.has_function('stpcpy', prefix : '#include <string.h>')
glib_conf.set('HAVE_STPCPY', 1)
endif
# Check that posix_memalign() is usable; must use header
if cc.has_function('posix_memalign', prefix : '#include <stdlib.h>')
if host_system != 'windows' and cc.has_function('posix_memalign', prefix : '#include <stdlib.h>')
glib_conf.set('HAVE_POSIX_MEMALIGN', 1)
endif