A new test I added was failing with -std=gnu++23 because that flag was removed from the test options (but only after checking if it met the c++20 effective target).
Tested x86_64-linux. Pushed to trunk. -- >8 -- The { dg-add-options no_pch } directive is supposed to add a macro definition that invalidates the PCH file, and ensures that the #include directives in the test file are processed as written. But the proc that adds the options actually removes all existing options, cancelling out any previous dg-options directive. This means that using no_pch will cause FAILs in a file that relies on other options set by an earlier dg-options. The no_pch directive was added for PR libstdc++/21769 where Janis suggested adding it as return "$flags -D__GLIBCXX__=99999999" but what was actually committed didn't include the $flags so replaced them. Additionally, using no_pch only prevents the precompiled version of <bits/stdc++.h> from being included, it doesn't prevent the non-precompiled version being included by -include bits/stdc++.h in the test flags. Use regsub to filter that out of the options as well. libstdc++-v3/ChangeLog: * testsuite/lib/dg-options.exp (add_options_for_no_pch): Remove any "-include bits/stdc++.h" from options and add the macro to the existing options instead of replacing them. --- libstdc++-v3/testsuite/lib/dg-options.exp | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/libstdc++-v3/testsuite/lib/dg-options.exp b/libstdc++-v3/testsuite/lib/dg-options.exp index 73c1552e682..15e34f8a646 100644 --- a/libstdc++-v3/testsuite/lib/dg-options.exp +++ b/libstdc++-v3/testsuite/lib/dg-options.exp @@ -269,8 +269,10 @@ proc dg-require-target-fs-lwt { args } { } proc add_options_for_no_pch { flags } { + # Remove any inclusion of bits/stdc++.h from the options. + regsub -all -- "-include bits/stdc...h" $flags "" flags # This forces any generated and possibly included PCH to be invalid. - return "-D__GLIBCXX__=99999999" + return "$flags -D__GLIBCXX__=99999999" } # Add to FLAGS all the target-specific flags needed for networking. -- 2.41.0