https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110900
--- Comment #5 from danakj at orodu dot net --- > Can you please read https://gcc.gnu.org/bugs/ on what we need? Yeah, sorry I can't reproduce this locally on my Mac or Windows machine. It reproduces on github Linux CI bots, and I have diagnosed it from there. https://github.com/chromium/subspace/actions/runs/5758764036/job/15611774084?pr=306 This job is using gcc 13.1.0, and it installs libstdc++-13-dev. Here's the command that fails: /usr/bin/g++-13 -I/home/runner/work/subspace/subspace -I/home/runner/work/subspace/subspace/third_party/googletest -I/home/runner/work/subspace/subspace/third_party/fmt/include -isystem /home/runner/work/subspace/subspace/third_party/googletest/googletest/include -isystem /home/runner/work/subspace/subspace/third_party/googletest/googletest -isystem /usr/include/c++/13 -isystem /usr/include/x86_64-linux-gnu/c++/13 -isystem /usr/include/c++/13/backward -isystem /usr/lib/gcc/x86_64-linux-gnu/13/include -isystem /usr/local/include -isystem /usr/include/x86_64-linux-gnu -isystem /usr/include -O3 -DNDEBUG -std=gnu++20 -fno-rtti -Werror -MD -MT sus/CMakeFiles/subspace_unittests.dir/iter/iterator_unittest.cc.o -MF sus/CMakeFiles/subspace_unittests.dir/iter/iterator_unittest.cc.o.d -o sus/CMakeFiles/subspace_unittests.dir/iter/iterator_unittest.cc.o -c /home/runner/work/subspace/subspace/sus/iter/iterator_unittest.cc I think it's simplest to just do a git clone and build that though... as I can't easily minmize this.