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Date: Tue, 7 Jul 2015 09:21:56 -0400
From: Rich Felker <>
Subject: Re: [PATCH v9] Build process uses script to add CFI
 directives to x86 asm

On Tue, Jul 07, 2015 at 07:45:34AM +0200, Alex wrote:
> On Tue, Jul 7, 2015 at 5:39 AM, Rich Felker <> wrote:
> > On Tue, Jun 23, 2015 at 09:18:08PM +0200, Alex Dowad wrote:
> >> Dear musl devs,
> >>
> >> ../configure now checks CFLAGS as well as CFLAGS_AUTO to see if generation of debug
> >> info was requested.
> >>
> >> The idea of removing duplication from the Makefile using a new AS_CMD variable has
> >> come up several times, but this will not work because the arguments need to be
> >> inserted in different places. I have tried using a Makefile 'define' instead.
> >> Please see whether you like the way this code reads or not.
> >>
> >> Subarch asm files are treated the same as other asm files. Please note that
> >> since I don't own the hardware, I can't test whether these Makefile rules work or not.
> >
> > I'm trying to test this and get it merged, but I'm not having any luck
> > getting gdb to backtrace when I interrupt a syscall with ^C. I've
> > tried pause() and syscall(SYS_pause) (cancellable and non-cancellable)
> > and the patch doesn't seem to help at all for the former, and only
> > helps mildly for the latter. Have you had better results than I did?
> I tested a different set of library calls, with my own test programs.
> Can you please send a copy of the test program you are using, and I
> will debug? Thanks, AD

Here it is. Compile with -g -O0 to make a more interesting backtrace
(if it works).


View attachment "canbt.c" of type "text/plain" (176 bytes)

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