Since the rest of the advisory is demanding full scale rewrites into a new language based on llvm that has officially nuetered it's gcc port, I don't think they really care about those sorts of concerns. Hence my annoyance at their proposal. The fbounds devs do, as the design allows for modified source to be still compilable in alternative toolchains that do not support fbounds (you can remove them via macros) and they are working to add it to gcc. And I don't think its going to matter much soon if it's limited to gcc/llvm, as all the proprietary vendors left and right are dropping their 30+ year compilers to piggyback off llvm (I don't exactly agree with this btw, but it is what it is).