So I had similar issues back when I originally wrote the clang linter — on Big Sur. The TL;DR for me was that Catalina originally shipped with broken cmath headers, something future updates wouldn’t necessarily fix. The only way to fix it was to: 1. Reinstall CLT 2. Reinstall/install Xcode 3. Repeat the above until it was fixed Now you may have an unrelated issue, but my error messages (e.g. about missing “signbit”, “std::less_than”, etc in global namespace) were very very similar. See discussions here: 1. https://gitlab.com/petsc/petsc/-/merge_requests/3773 <https://gitlab.com/petsc/petsc/-/merge_requests/3773> 2. https://stackoverflow.com/questions/58628377/catalina-c-using-cmath-headers-... <https://stackoverflow.com/questions/58628377/catalina-c-using-cmath-headers-yield-error-no-member-named-signbit-in-th> 3. https://stackoverflow.com/questions/58313047/cannot-compile-r-packages-with-... If these help then you’re lucky I never clean out my “misc” bookmarks folder :) Best regards, Jacob Faibussowitsch (Jacob Fai - booss - oh - vitch)

On Dec 8, 2021, at 09:06, Mark Adams <[email protected]> wrote:

Monterey. And my serial, optimized build works but it seems to use the same compiler. I am testing the parallel build again with debug turned off.

On Wed, Dec 8, 2021 at 9:04 AM Jacob Faibussowitsch <[email protected] <mailto:[email protected]>> wrote: You aren’t by chance on Catalina are you?

Best regards,

Jacob Faibussowitsch (Jacob Fai - booss - oh - vitch)

...

On Dec 8, 2021, at 08:49, Mark Adams <[email protected] <mailto:[email protected]>> wrote:

I am failing on OSX with openmpi. Kokkos is failing to build. I seem to be using:

(conda_env) 08:46 1 adams/fix_mat_ex5k *= ~/Codes/petsc2$ /usr/local/Cellar/open-mpi/4.1.1_2/bin/mpicxx --version Apple clang version 13.0.0 (clang-1300.0.29.3) Target: x86_64-apple-darwin21.1.0 Thread model: posix InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin

Any ideas? Thanks, Mark <configure.log>