diff --git a/configure.ac b/configure.ac index a52830b38..ebe6d4267 100644 --- a/configure.ac +++ b/configure.ac @@ -157,6 +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 $LDFLAGS" +# On some platforms, new-style atomics need a helper library +AC_MSG_CHECKING(whether -latomic is needed) +AC_LINK_IFELSE([AC_LANG_SOURCE([[ +#include +uint64_t v; +int main() { + return (int)__atomic_load_n(&v, __ATOMIC_ACQUIRE); +}]])], GCC_ATOMIC_BUILTINS_NEED_LIBATOMIC=no, GCC_ATOMIC_BUILTINS_NEED_LIBATOMIC=yes) +AC_MSG_RESULT($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"])