https://gcc.gnu.org/bugzilla/show_bug.cgi?id=50871
--- Comment #16 from Jonathan Wakely <redi at gcc dot gnu.org> --- (In reply to Jason Merrill from comment #15) > (In reply to Jonathan Wakely from comment #14) > > It's better than what we have today, but I'm not sure it's where we want to > > get to in the long term. > > > > I've been trying a patch that allows the system_header pragma to be > > disabled when building and testing. > > How about using > > #pragma GCC diagnostic warning "-Wsystem-headers" > > instead? That doesn't work well, see PR 80472 > > This causes testsuite failures due to > > warnings that can't be controlled by options or diagnostic pragmas: > > > > /home/jwakely/build/powerpc64le-unknown-linux-gnu/libstdc++-v3/include/cmath: > > 47: error: #include_next is a GCC extension > > Maybe leave off -Wpedantic for now. Yep. It would be nice if we had __include_next, or could add __extension__ to avoid those warnings. > > /home/jwakely/build/powerpc64le-unknown-linux-gnu/libstdc++-v3/include/ > > complex:1951: warning: floating point suffix 'if' shadowed by implementation > > This seems like a real issue. Perhaps for C++14 and up we should disable > the built-in complex suffixes. See PR 79228
