libstdc++: Add options for libatomic to test

This fixes a linker error on AIX:

FAIL: 30_threads/semaphore/try_acquire_posix.cc (test for excess errors)
Excess errors:
ld: 0711-317 ERROR: Undefined symbol: .__atomic_fetch_add_8
ld: 0711-317 ERROR: Undefined symbol: .__atomic_load_8
ld: 0711-317 ERROR: Undefined symbol: .__atomic_fetch_sub_8
ld: 0711-345 Use the -bloadmap or -bnoquiet option to obtain more information.
collect2: error: ld returned 8 exit status

libstdc++-v3/ChangeLog:

	* testsuite/30_threads/semaphore/try_acquire_posix.cc: Add
	options for libatomic.

diff --git a/libstdc++-v3/testsuite/30_threads/semaphore/try_acquire_posix.cc b/libstdc++-v3/testsuite/30_threads/semaphore/try_acquire_posix.cc
index 97e386f..2d9ae40 100644 (file)
--- a/libstdc++-v3/testsuite/30_threads/semaphore/try_acquire_posix.cc
+++ b/libstdc++-v3/testsuite/30_threads/semaphore/try_acquire_posix.cc
@@ -19,6 +19,7 @@
 // { dg-do run { target c++2a } }
 // { dg-require-effective-target pthread }
 // { dg-require-gthreads "" }
+// { dg-add-options libatomic }
 
 #include <semaphore>
 #ifdef _GLIBCXX_HAVE_POSIX_SEMAPHORE