http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59039
--- Comment #17 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to Richard Biener from comment #16)
> > I couldn't find anything in GCC manual.
>
> See tm.texi / md.texi.
This is the only thing I found:
-- Macro: DONT_USE_BUILTIN_SETJMP
Define this macro to 1 if the 'setjmp'/'longjmp'-based scheme
should use the 'setjmp'/'longjmp' functions from the C library
instead of the '__builtin_setjmp'/'__builtin_longjmp' machinery.
It doesn't say they can't be used in the same
function, the size of the jump buffer, nor what
each field in the jump buffer is used for.
