gcc: Enable <stacktrace>

[HazardyKnusperkeks]

Fixes #14082.

[HazardyKnusperkeks]

I'll try to get the patches into upstream.

[HazardyKnusperkeks]

So what is the error here? Shouldn't MPC be a dependency already? How did you update gcc before?

[lazka]

hm, could be gcc version checking failing somehow. I updated mpc yesterday

edit:

In file included from conftest.c:10:
C:/msys64/ucrt64/include/mpc.h:287:35: error: unknown type name 'FILE'
  287 | __MPC_DECLSPEC void mpcr_out_str (FILE *f, mpcr_srcptr r);
      |                                   ^~~~
C:/msys64/ucrt64/include/mpc.h:27:1: note: 'FILE' is defined in header '<stdio.h>'; did you forget to '#include <stdio.h>'?
   26 | #include "mpfr.h"
   27 | 

sorry for the bad timing :/ see #14566

[HazardyKnusperkeks]

So, is this good?

[lazka]

I don't think we have any GCC/libbacktrace developers here, so this is hard/impossible to judge.

Upstream development happens here afaik: https://github.com/ianlancetaylor/libbacktrace

[HazardyKnusperkeks]

I can tell you: it works. ;)

So I have to wait to get the patches accepted upstream?

[lazka]

I can tell you: it works. ;)

I believe you, but I can tell you that I'm not going to spend extra time maintaining it, rebasing it, debugging it, etc ;)

So I have to wait to get the patches accepted upstream?

Yes, but we are happy to backport things, so they are available to users right away once upstream had a look.

[lazka]

What's the status of this?

[HazardyKnusperkeks]

What's the status of this?

The review process of gcc is really not my favorite, some patches are landed, some are outstanding. I just need to motivate myself to ask again.

[ognevny]

looks like stacktrace will be enabled in gcc 14

[HazardyKnusperkeks]

Yes, and most of my patches are applied, but not all of them. When the last one has landed (for gcc 15) I'll update this PR, but I'll wait for GCC 14 to be released and my vacation to be over. ;)

[ognevny]

Yes, and most of my patches are applied, but not all of them. When the last one has landed (for gcc 15) I'll update this PR, but I'll wait for GCC 14 to be released and my vacation to be over. ;)

sounds good. maybe it will be nice to backport the patch after GCC 14 update is pushed

[HazardyKnusperkeks]

This is the updated version, all patches except for the last one (tlhelp32 check in libstdc++) have been landed in upstream gcc and will be part of gcc 15. The last patch I'll send out later.

I've successfully tested it on UCTR64.

[HazardyKnusperkeks]

The last commit was accepted upstream. Can we merge this @lazka ?

[lazka]

I'll have a look, thanks