Explicitly link with libatomic when needed.

	2020-02-29  John David Anglin  <danglin@gcc.gnu.org>

	* testsuite/30_threads/stop_token/stop_callback.cc: Add libatomic
	option.
	* testsuite/30_threads/stop_token/stop_callback/deadlock-mt.cc:
	Likewise.
	* testsuite/30_threads/stop_token/stop_callback/deadlock.cc: Likewise.
	* testsuite/30_threads/stop_token/stop_callback/destroy.cc: Likewise.
	* testsuite/30_threads/stop_token/stop_callback/invoke.cc: Likewise.
	* testsuite/30_threads/stop_token/stop_source.cc: Likewise.
	* testsuite/30_threads/stop_token/stop_source/assign.cc: Likewise.
	* testsuite/30_threads/stop_token/stop_token.cc: Likewise.
	* testsuite/30_threads/stop_token/stop_token/stop_possible.cc:
	Likewise.

libstdc++-v3/ChangeLog

 2020-02-29  John David Anglin  <danglin@gcc.gnu.org>
 
+	* testsuite/30_threads/stop_token/stop_callback.cc: Add libatomic
+	option.
+	* testsuite/30_threads/stop_token/stop_callback/deadlock-mt.cc:
+	Likewise.
+	* testsuite/30_threads/stop_token/stop_callback/deadlock.cc: Likewise.
+	* testsuite/30_threads/stop_token/stop_callback/destroy.cc: Likewise.
+	* testsuite/30_threads/stop_token/stop_callback/invoke.cc: Likewise.
+	* testsuite/30_threads/stop_token/stop_source.cc: Likewise.
+	* testsuite/30_threads/stop_token/stop_source/assign.cc: Likewise.
+	* testsuite/30_threads/stop_token/stop_token.cc: Likewise.
+	* testsuite/30_threads/stop_token/stop_token/stop_possible.cc:
+	Likewise.
+
 	PR libstdc++/92906
 	* config/abi/post/hppa-linux-gnu/baseline_symbols.txt: Update.
 

libstdc++-v3/testsuite/30_threads/stop_token/stop_callback.cc

@@ -16,6 +16,7 @@
 // <http://www.gnu.org/licenses/>.
 
 // { dg-options "-std=gnu++2a" }
+// { dg-add-options libatomic }
 // { dg-do run { target c++2a } }
 
 #include <stop_token>

libstdc++-v3/testsuite/30_threads/stop_token/stop_callback/deadlock-mt.cc

@@ -16,6 +16,7 @@
 // <http://www.gnu.org/licenses/>.
 
 // { dg-options "-std=gnu++2a -pthread"  }
+// { dg-add-options libatomic }
 // { dg-require-effective-target c++2a }
 // { dg-require-effective-target pthread }
 // { dg-require-gthreads "" }

libstdc++-v3/testsuite/30_threads/stop_token/stop_callback/deadlock.cc

@@ -16,6 +16,7 @@
 // <http://www.gnu.org/licenses/>.
 
 // { dg-options "-std=gnu++2a" }
+// { dg-add-options libatomic }
 // { dg-do run { target c++2a } }
 
 #include <stop_token>

libstdc++-v3/testsuite/30_threads/stop_token/stop_callback/destroy.cc

@@ -16,6 +16,7 @@
 // <http://www.gnu.org/licenses/>.
 
 // { dg-options "-std=gnu++2a -pthread"  }
+// { dg-add-options libatomic }
 // { dg-require-effective-target c++2a }
 // { dg-require-effective-target pthread }
 // { dg-require-gthreads "" }

libstdc++-v3/testsuite/30_threads/stop_token/stop_callback/invoke.cc

@@ -16,6 +16,7 @@
 // <http://www.gnu.org/licenses/>.
 
 // { dg-options "-std=gnu++2a" }
+// { dg-add-options libatomic }
 // { dg-do run { target c++2a } }
 
 #include <stop_token>

libstdc++-v3/testsuite/30_threads/stop_token/stop_source.cc

@@ -16,6 +16,7 @@
 // <http://www.gnu.org/licenses/>.
 
 // { dg-options "-std=gnu++2a" }
+// { dg-add-options libatomic }
 // { dg-do run { target c++2a } }
 
 #include <stop_token>

libstdc++-v3/testsuite/30_threads/stop_token/stop_source/assign.cc

@@ -16,6 +16,7 @@
 // <http://www.gnu.org/licenses/>.
 
 // { dg-options "-std=gnu++2a" }
+// { dg-add-options libatomic }
 // { dg-do run { target c++2a } }
 
 #include <stop_token>

libstdc++-v3/testsuite/30_threads/stop_token/stop_token.cc

@@ -16,6 +16,7 @@
 // <http://www.gnu.org/licenses/>.
 
 // { dg-options "-std=gnu++2a" }
+// { dg-add-options libatomic }
 // { dg-do run { target c++2a } }
 
 #include <stop_token>

libstdc++-v3/testsuite/30_threads/stop_token/stop_token/stop_possible.cc

@@ -16,6 +16,7 @@
 // <http://www.gnu.org/licenses/>.
 
 // { dg-options "-std=gnu++2a" }
+// { dg-add-options libatomic }
 // { dg-do run { target c++2a } }
 
 #include <stop_token>