Le 23/02/2018 à 13:01, Joerg Sonnenberger a écrit :
On Fri, Feb 23, 2018 at 09:00:56AM +0000, Maxime Villard wrote:
Module Name:    src
Committed By:   maxv
Date:           Fri Feb 23 09:00:56 UTC 2018

Modified Files:
        src/sys/arch/amd64/conf: Makefile.amd64
        src/sys/arch/i386/conf: Makefile.i386

Log Message:
Add -fno-shrink-wrap, to force GCC to push the frames at the very beginning
of the functions. Otherwise DDB is unable to display a correct stack trace
if a fault occurred in a function before the frame was pushed.

Discussed on tech-kern@, flag suggested by Krister Walfridsson. Should fix

Please revert this. This makes the mistake of unconditionally adding
-fno-omit-frame-pointer even worse as well as breaking the build with
clang unconditionally.

Ok, I'll look for the Clang equivalent.

Heck, it wasn't even discussed on tech-kern.

It was discussed on tech-kern.

If anything, this should be done in the kernel config next to the
-fno-omit-frame-potiner setting. This is a concession to DDB only,
unlike i.e. -mcmode=kernel, it is not necessary for ABI reasons or

Moving -fno-shrink-wrap next to -fno-omit-frame-pointer did not fix the
issues. That is to say, the frame was _not_ pushed at the beginning of the

Reply via email to