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.

From-SVN: r234761

diff --git a/libstdc++-v3/ChangeLog b/libstdc++-v3/ChangeLog
index e12cfbf1bde5c91b02d1463879533bbf8787c290..4f9e9ef89b825560b6eb461bb2410a4f8e55488b 100644 (file)
--- a/libstdc++-v3/ChangeLog
+++ b/libstdc++-v3/ChangeLog
@@ -1,5 +1,10 @@
 2016-04-05  Jonathan Wakely  <jwakely@redhat.com>
 
+       PR libstdc++/70554
+       * acinclude.m4 (GLIBCXX_ENABLE_ATOMIC_BUILTINS): Don't test
+       __atomic_fetch_add for bool.
+       * configure: Regenerate.
+
        * testsuite/30_threads/thread/70503.cc: Require -static to work.
 
        PR libstdc++/70503

diff --git a/libstdc++-v3/acinclude.m4 b/libstdc++-v3/acinclude.m4
index 95df24a9062d853f8e416230535a7a2a91bafc77..b0f88cbb4040f1417d2f0d734083667412b8ef76 100644 (file)
--- a/libstdc++-v3/acinclude.m4
+++ b/libstdc++-v3/acinclude.m4
@@ -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);

diff --git a/libstdc++-v3/configure b/libstdc++-v3/configure
index acbc6a6bd6e962ec7c8b9d7f6db0184d67811587..41797a971b536fa06dc4b6d4733f75e6aef2d6a3 100755 (executable)
--- a/libstdc++-v3/configure
+++ b/libstdc++-v3/configure
@@ -15229,7 +15229,7 @@ typedef bool atomic_type;
        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);
@@ -15395,7 +15395,7 @@ 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);