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Use more robust test for libatomics

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Taken from Mesa configure script:

https://github.com/mesa3d/mesa/blob/17.2/configure.ac#L405-L427
This commit is contained in:
Matthew Bauer 2019-10-01 21:22:18 -04:00
parent 74b4737d8f
commit b1c34152fe
1 changed files with 12 additions and 5 deletions
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17
configure.ac
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@ -157,11 +157,18 @@ AX_BOOST_BASE([1.66], [CXXFLAGS="$BOOST_CPPFLAGS $CXXFLAGS"], [AC_MSG_ERROR([Nix
# ends up with LDFLAGS being empty, so we set it afterwards.
LDFLAGS="$BOOST_LDFLAGS $LDFLAGS"
# Boost atomic needs GCC libatomic on 32-bit ARM
case "$host_cpu" in
armv5*|armv6*|armv7*) LIBS="-latomic $LIBS"
esac
# On some platforms, new-style atomics need a helper library
AC_MSG_CHECKING(whether -latomic is needed)
AC_LINK_IFELSE([AC_LANG_SOURCE([[
#include <stdint.h>
uint64_t v;
int main() {
return (int)__atomic_load_n(&v, __ATOMIC_ACQUIRE);
}]])], GCC_ATOMIC_BUILTINS_NEED_LIBATOMIC=no, GCC_ATOMIC_BUILTINS_NEED_LIBATOMIC=yes)
AC_MSG_RESULT($GCC_ATOMIC_BUILTINS_NEED_LIBATOMIC)
if test "x$GCC_ATOMIC_BUILTINS_NEED_LIBATOMIC" = xyes; then
LIBS="-latomic $LIBS"
fi
# Look for OpenSSL, a required dependency.
PKG_CHECK_MODULES([OPENSSL], [libcrypto], [CXXFLAGS="$OPENSSL_CFLAGS $CXXFLAGS"])