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-rw-r--r--build-aux/m4/l_atomic.m45
1 files changed, 4 insertions, 1 deletions
diff --git a/build-aux/m4/l_atomic.m4 b/build-aux/m4/l_atomic.m4
index 40639dfe61..602b57fe43 100644
--- a/build-aux/m4/l_atomic.m4
+++ b/build-aux/m4/l_atomic.m4
@@ -18,7 +18,7 @@ m4_define([_CHECK_ATOMIC_testbody], [[
int main() {
std::atomic<bool> lock{true};
- std::atomic_exchange(&lock, false);
+ lock.exchange(false);
std::atomic<std::chrono::seconds> t{0s};
t.store(2s);
@@ -34,6 +34,8 @@ m4_define([_CHECK_ATOMIC_testbody], [[
AC_DEFUN([CHECK_ATOMIC], [
AC_LANG_PUSH(C++)
+ TEMP_CXXFLAGS="$CXXFLAGS"
+ CXXFLAGS="$CXXFLAGS $PTHREAD_CFLAGS"
AC_MSG_CHECKING([whether std::atomic can be used without link library])
@@ -51,5 +53,6 @@ AC_DEFUN([CHECK_ATOMIC], [
])
])
+ CXXFLAGS="$TEMP_CXXFLAGS"
AC_LANG_POP
])