[Bug c/83324] [feature request] Pragma or special syntax for guaranteed tail calls

[andi at firstfloor dot org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83324

--- Comment #32 from andi at firstfloor dot org ---
The feature is currently only supported with standard C/C++ attributes
([[clang/gnu::musttail]]), not __attribute__

But given that you have existing code that uses the old syntax
and clang supports that too we should probably add that too.