> It is however used when building libada if target specific version is not > specified > in gcc/ada/gcc_interface/Makefile.in.
Well, then you should submit changes for Makefile.in for your unsupported target. That being said, see below: > In that case building libada fails due to missing Support_Atomic_Primitives. Yes, this is a known issue, see PR 54125. The fix is coming soon, and is quite different from your patch. Arno