https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114990
--- Comment #10 from Jason Merrill <jason at gcc dot gnu.org> --- (In reply to cqwrteur from comment #9) > (In reply to Jason Merrill from comment #8) > > bar.cppm:4:20: error: conflicting declaration of ‘void foo()’ in module > > ‘bar’ > > 4 | export inline void foo() noexcept; > > | ^~~ > > In file included from bar.cppm:2: > > someheader.hpp:1:13: note: previously declared in global module > > That is my problem. This just breaks header only libraries right? No, you just need to #include the library header before the "export module" line. Or better yet, use import <header> instead of #include. > This is the same. > > import std; > #include<aheaderonlylibrary> //it uses std features. > > This is absolutely the standard bug. This is a GCC bug, as described in comment #1. If you import <aheaderonlylibrary>; instead, it should work fine. Naturally, that requires that you first g++ -fmodules-ts -c -x c++-system-header aheaderonlylibrary
