Re: Re: [PATCH] generate debug_frame info for __syscall_cp_asm (i386) so gdb can get backtrace

[Rich Felker <dalias@libc.org>]

On Wed, Apr 29, 2015 at 06:51:29PM +0200, Alex Dowad wrote:
> On Wed, 29 Apr 2015 11:57:03 -0400, Rich Felkner wrote:
> > It would be either sed or awk most likely. Plain shell would work for
> > writing it too but would probably be uglier, and sed is already
> > required anyway for alltypes.h generation. If any new tool were
> > required (unlikely) then configure would just detect its absence and
> > turn off cfi generation for asm if it's missing/broken.
> 
> I can try coding up an awk script if you like (no sed, sorry). It will be a
> filter which the asm passes through to add the .cfi_* directives. Does that
> sound good?
> 
> (I really, really hope you weren't looking for an awk/sed script which takes
> asm as input and generates a DWARF file as output...)

Of course not; I meant for it to produce asm with cfi directives as
output. If you'd like to give it a try that would be great. Some of
the main criteria that would matter for inclusion in musl would be
portable awk usage (standard awk, not gawk/etc., and compatible with
Busybox) and the ability to support multiple archs -- even if the
initial code is x86-only, it should take $ARCH as an argument and be
reasonably easy for others to extend it to support other archs.

Rich