libstdc++: Add explicit -std=gnu++17 option to test

This test has no -std option so when the testsuite is run with
-std=gnu++20 or later, this test will use that. The recent addition of
no_unique_address will cause it to FAIL, because that's a reserved word
after C++17. Add an explicit option, so that this test alays uses
exactly C++17.

libstdc++-v3/ChangeLog:

	* testsuite/17_intro/headers/c++2017/all_attributes.cc: Add
	-std=gnu++17 option.

(cherry picked from commit 45fb3d45a4d4b79a00c56fa93e9e69d9d7762ca0)

diff --git a/libstdc++-v3/testsuite/17_intro/headers/c++2017/all_attributes.cc b/libstdc++-v3/testsuite/17_intro/headers/c++2017/all_attributes.cc
index 811b3fe3613a964c3308130ef2869c433400b263..ea2c7d20ba2c5b5ee306b41a06b26cbd671bffd1 100644 (file)
--- a/libstdc++-v3/testsuite/17_intro/headers/c++2017/all_attributes.cc
+++ b/libstdc++-v3/testsuite/17_intro/headers/c++2017/all_attributes.cc
@@ -15,6 +15,7 @@
 // with this library; see the file COPYING3.  If not see
 // <http://www.gnu.org/licenses/>.
 
+// { dg-options "-std=gnu++17" }
 // { dg-do compile { target c++17 } }
 
 // Ensure the library only uses the __name__ form for attributes.