[PATCH] Declare functions that unconditionally call FatalError as _X_NORETURN.
Mark Kettenis
mark.kettenis at xs4all.nl
Sat May 22 11:32:52 PDT 2010
> From: Jeremy Huddleston <jeremyhu at apple.com>
> Date: Sat, 22 May 2010 09:17:27 -0700
>
> On May 22, 2010, at 02:02, Mark Kettenis wrote:
>
> >> From: Jamey Sharp <jamey at minilop.net>
> >> Date: Fri, 21 May 2010 22:16:50 -0700
> >>
> >> For AtomError, this should fix a clang warning; in the other cases it's
> >> just good documentation.
> >
> > Adding _X_NORETURN to a function will destroy the possibility to do
> > backtraces from said function on many architectures.
>
> Really? Why is that?
Compiler developers use the fact that a function doesn't return as a
license for optimizations that destroy the function return address or
frame pointer. It's especially nasty with GCC on arm, but there are
other platforms where this is also a problem.
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