C++ programs fail to build with -fmodules

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From: Jordan Gordeev <jgopensource_at_proton.me>
Date: Sat, 26 Apr 2025 18:25:40 UTC

Programs written in C++ fail to build with -fmodules on 15.0-CURRENT if they include the headers <locale>, <vector>, <iostream> or any other header that includes <locale>.

The flag -fmodules enables a feature known as clang modules. You can read more about that feature here: https://clang.llvm.org/docs/Modules.html

On 14.2 building with -fmodules works.

I've filed a problem report about the issue: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=286342

Anyone who can help with this issue is welcome to do so.

Best regards,
Jordan Gordeev