dblaikie added a comment. The clang side might benefit from a test with a function declaration, a call to that function, but no definition of it - with optimizations enabled, clang should emit the DISubprogram for that function for the purpose of call site DWARF, I think? (or maybe that behavior got rolled back for now? In which case the nearest thing I can think of/the only other place where we produce DWARF for a declaration would be for a member function declaration in a type DIE - are btf attributes supported there (or are they only supported in C, in which case there's no such thing as a member function)?
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