commit 7591475c21a34bbcce6d225ea7640d35022fb8ff
Author: Jonathan Wakely <jwakely@redhat.com>
Date: Tue Apr 5 19:16:05 2016 +0100
Restore atomic builtins usage in libstdc++-v3
PR libstdc++/70554
* acinclude.m4 (GLIBCXX_ENABLE_ATOMIC_BUILTINS): Don't test
__atomic_fetch_add for bool.
* configure: Regenerate.
@@ -3290,7 +3290,7 @@ AC_DEFUN([GLIBCXX_ENABLE_ATOMIC_BUILTINS], [
atomic_type c1;
atomic_type c2;
atomic_type c3(0);
- __atomic_fetch_add(&c1, c2, __ATOMIC_RELAXED);
+ // N.B. __atomic_fetch_add is not supported for bool.
__atomic_compare_exchange_n(&c1, &c2, c3, true, __ATOMIC_ACQ_REL,
__ATOMIC_RELAXED);
__atomic_test_and_set(&c1, __ATOMIC_RELAXED);
@@ -3375,7 +3375,7 @@ int main()
atomic_type c1;
atomic_type c2;
atomic_type c3(0);
- __atomic_fetch_add(&c1, c2, __ATOMIC_RELAXED);
+ // N.B. __atomic_fetch_add is not supported for bool.
__atomic_compare_exchange_n(&c1, &c2, c3, true, __ATOMIC_ACQ_REL,
__ATOMIC_RELAXED);
__atomic_test_and_set(&c1, __ATOMIC_RELAXED);