GCC trunk not built for over a week due to GNAT build failure

../../../../../../../gcc-trunk-20190129/libstdc++-v3/src/filesystem/ops.cc: In function 'T {anonymous}::do_stat(const std::experimental::filesystem::v1::__cxx11::path&, std::error_code&, Accessor, T) [with Accessor = std::experimental::filesystem::v1::file_size(const std::experimental::filesystem::v1::__cxx11::path&, std::error_code&)::<lambda(const auto:1&)>; T = std::experimental::filesystem::v1::file_size(const std::experimental::filesystem::v1::__cxx11::path&, std::error_code&)::S]':
../../../../../../../gcc-trunk-20190129/libstdc++-v3/src/filesystem/ops.cc:783:5: warning: empty class 'std::experimental::filesystem::v1::file_size(const std::experimental::filesystem::v1::__cxx11::path&, std::error_code&)::<lambda(const auto:1&)>' parameter passing ABI changes in -fabi-version=12 (GCC 8) [-Wabi]
  783 |     do_stat(const fs::path& p, std::error_code& ec, Accessor f, T deflt)
      |     ^~~~~~~

Not sure if this is our issue or upstream…

[mattgodbolt]

Seems good now: thanks 😃

[Mitchtdk]

I sent an email to AdaCore yesterday via their bug reporting email, and I received a patch to apply today. I have confirmed with them that on my VM I have been able to successfully build GCC (including GNAT) with the default multilib-list options CE has (--with-multilib-list=m32,m64,mx32). They have confirmed that the patch has been up streamed.

I have rebuilt the updated trunk and again I have not had anymore issues in building GCC (gcc (GCC-Explorer-Build) 9.0.1 20190206 (experimental)) and GNAT (GNAT 9.0.1 20190206 (experimental)).