The 17_intro/headers/c++1998/49745.cc test fails for C++20 mode with PCH
enabled, because PCH makes it include <bits/stdc++.h>, which includes
<atomic>, and that includes <unistd.h> in C++20 mode. The <unistd.h>
dependency should go away when C++20 atomic waiting is stable, but will
probably remain while the feature is experimental. Change the test to
always include <bits/stdc++.h>, and XFAIL for C++20 and later.
libstdc++-v3/ChangeLog:
PR libstdc++/99995
* testsuite/17_intro/headers/c++1998/49745.cc: Include all
standard headers and XFAIL for effective-target c++20.
Tested x86_64-linux. Committed to trunk.
commit 29046e02b84a16b6315d952d7f76c502d0d021c2
Author: Jonathan Wakely <jwak...@redhat.com>
Date: Mon Apr 12 11:12:47 2021
libstdc++: Fix test that fails in C++20 mode [PR 99995]
The 17_intro/headers/c++1998/49745.cc test fails for C++20 mode with PCH
enabled, because PCH makes it include <bits/stdc++.h>, which includes
<atomic>, and that includes <unistd.h> in C++20 mode. The <unistd.h>
dependency should go away when C++20 atomic waiting is stable, but will
probably remain while the feature is experimental. Change the test to
always include <bits/stdc++.h>, and XFAIL for C++20 and later.
libstdc++-v3/ChangeLog:
PR libstdc++/99995
* testsuite/17_intro/headers/c++1998/49745.cc: Include all
standard headers and XFAIL for effective-target c++20.
diff --git a/libstdc++-v3/testsuite/17_intro/headers/c++1998/49745.cc
b/libstdc++-v3/testsuite/17_intro/headers/c++1998/49745.cc
index a13a40ec7db..204975e0316 100644
--- a/libstdc++-v3/testsuite/17_intro/headers/c++1998/49745.cc
+++ b/libstdc++-v3/testsuite/17_intro/headers/c++1998/49745.cc
@@ -18,5 +18,7 @@
// <http://www.gnu.org/licenses/>.
// libstdc++/49745
-#include <iostream>
+#include <bits/stdc++.h>
int truncate = 0;
+
+// { dg-xfail-if "PR libstdc++/99995" { c++20 } }
