This is the mail archive of the
mailing list for the GCC project.
Re: [Qemu-devel] gcc auto-omit-frame-pointer vs msvc longjmp
Kai Tietz wrote:
> For trunk-version I have a tentative patch for this issue. On 4.6.x
> and older branches this doesn't work, as here we can't differenciate
> that easy between ms- and sysv-abi.
> But could somebody give this patch a try?
> * config/i386/i386.c (ix86_frame_pointer_required): Enforce use of
> frame-pointer for 32-bit ms-abi, if setjmp is used.
> Index: i386.c
> --- i386.c (revision 180099)
> +++ i386.c (working copy)
> @@ -8391,6 +8391,10 @@
> if (SUBTARGET_FRAME_POINTER_REQUIRED)
> return true;
> + /* For older 32-bit runtimes setjmp requires valid frame-pointer. */
> + if (TARGET_32BIT_MS_ABI && cfun->calls_setjmp)
> + return true;
> /* In ix86_option_override_internal, TARGET_OMIT_LEAF_FRAME_POINTER
> turns off the frame pointer by default. Turn it back on now if
> we've not got a leaf function. */
For a gcc 4.7 snapshot, this does fix the longjmp problem that I
encountered. So aside from specifying -fno-omit-frame-pointer for
affected files, what can be done for 4.6?