https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66146
--- Comment #39 from Libor Bukata <libor.bukata at oracle dot com> --- (In reply to Libor Bukata from comment #38) > (In reply to Jonathan Wakely from comment #34) > > Untested sketch of a solution for Solaris and BSDs: > > https://gcc.gnu.org/pipermail/gcc-patches/2020-November/557928.html > > Thank you for the patch, I will test it on Solaris > and let you know when I have the results. Patched GCC master with Jonathan's patch, but unfortunately it is not compilable on Solaris 11: In file included from /gcc_nightly/build/sparcv9/sparcv9-sun-solaris2.11/libstdc++-v3/include/sparcv9-sun-solaris2.11/bits/c++config.h:568, from /gcc_nightly/build/sparcv9/sparcv9-sun-solaris2.11/libstdc++-v3/include/cassert:43, from /gcc_nightly/gcc-11.0.0-master/libstdc++-v3/include/precompiled/stdc++.h:33: /gcc_nightly/build/sparcv9/sparcv9-sun-solaris2.11/libstdc++-v3/include/mutex:861:10: error: token "{" is not valid in preprocessor expressions 861 | || _GLIBCXX_COMPAT_PTHREAD_ONCE_T | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ In file included from /gcc_nightly/build/sparcv9/sparcv9-sun-solaris2.11/libstdc++-v3/include/sparcv9-sun-solaris2.11/bits/c++config.h:568, from /gcc_nightly/build/sparcv9/sparcv9-sun-solaris2.11/libstdc++-v3/include/cassert:43, from /gcc_nightly/gcc-11.0.0-master/libstdc++-v3/include/precompiled/stdc++.h:33: /gcc_nightly/build/sparcv9/sparcv9-sun-solaris2.11/libstdc++-v3/include/mutex:861:10: error: token "{" is not valid in preprocessor expressions 861 | || _GLIBCXX_COMPAT_PTHREAD_ONCE_T | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ In file included from /gcc_nightly/build/sparcv9/sparcv9-sun-solaris2.11/libstdc++-v3/include/future:38, from /gcc_nightly/gcc-11.0.0-master/libstdc++-v3/include/precompiled/stdc++.h:105: /gcc_nightly/build/sparcv9/sparcv9-sun-solaris2.11/libstdc++-v3/include/mutex:675:15: error: explicitly defaulted function 'constexpr std::once_flag::once_flag()' cannot be declared 'constexpr' because the implicit declaration is not 'constexpr': 675 | constexpr once_flag() noexcept = default; | ^~~~~~~~~ /gcc_nightly/build/sparcv9/sparcv9-sun-solaris2.11/libstdc++-v3/include/mutex:699:12: note: defaulted constructor calls non-'constexpr' 'std::once_flag::_Once::_Once()' 699 | struct _Once _GLIBCXX_COMPAT_PTHREAD_ONCE_T; Note that there was a merge conflict with the current master, however, its resolution was straightforward. If there is an updated patch, I will be happy to test it as well.
