commit 8fa90926e08950cc00d0e22eace27402b9f9fa57
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Wed Sep 22 14:11:54 2021

    libstdc++: Disable PCH for test that depends on a macro being defined
    
    This test tries to ensure that <system_error> can be included after
    defining _XOPEN_SOURCE=600, which doesn't test anything if that header
    is already included via the <bits/stdc++.h> PCH before the macro
    definition. Disable PCH so that it behaves as intended.
    
    Signed-off-by: Jonathan Wakely <jwakely@redhat.com>
    
    libstdc++-v3/ChangeLog:
    
            * testsuite/19_diagnostics/headers/system_error/93151.cc:
            Disable PCH.

diff --git a/libstdc++-v3/testsuite/19_diagnostics/headers/system_error/93151.cc b/libstdc++-v3/testsuite/19_diagnostics/headers/system_error/93151.cc
index c54c9a3022d..6aca63d4db3 100644
--- a/libstdc++-v3/testsuite/19_diagnostics/headers/system_error/93151.cc
+++ b/libstdc++-v3/testsuite/19_diagnostics/headers/system_error/93151.cc
@@ -1,4 +1,5 @@
 // { dg-do compile { target c++11 } }
+// { dg-add-options no_pch }
 
 // Copyright (C) 2020-2021 Free Software Foundation, Inc.
 //