> For what its worth, it is only MSVC without support.
How recently? I've been enough versions back that clang documented pragmas haven't been available. The cleanup attribute... I can only find docs for GCC. Although I see LLVM bugs for it, so you're right about clang supporting it - at least on HEAD.
> gcc compiler extensions are otherwise still rather portable.
Portable or not, I'd say only about half the extensions I've sought out on clang have actually been available. If that.
> To clang and icc at least.
I should note in scenario #2 above I don't have these available either, since these are decent C++ compilers.
