https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111537
--- Comment #2 from Iain Buclaw <ibuclaw at gdcproject dot org> --- (In reply to David Malcolm from comment #1) > Am trying to reproduce locally, but when I run this in my BUILDDIR/gcc: > ./gdc -B. -S -fanalyzer oob.d > I get: > d21: error: cannot find source code for runtime library file 'object.d' > > Possibly a silly question, but what am I doing wrong? The library sources aren't in any paths that the compiler looks for. It should work without any explicit `-I` if the target libraries were installed. This alternative reproducer should get you off the ground though. --- mkdir gcc; echo "module gcc.builtins;" > gcc/builtins.d cat > oob.d << EOF module object; import gcc.builtins; void main() { char[5] arr; __builtin_strcpy(arr.ptr, "hello world"); } EOF ./gdc -B. -S -fanalyzer oob.d