Review Request 126309: backtrace and demangle for OS X, FreeBSD and Solaris/OpenIndiana

[René J.V. Bertin]

> On Jan. 1, 2016, 4:04 p.m., David Faure wrote:
> > This is kdelibs4support, this code is doomed to disappear and apps are using kDebug less and less. Is it worth risking compilation breakages on some systems?
> > 
> > Also I found kBacktrace less and less useful over the years because with hidden visibility I get a lot of "???" for non-exported methods. gdb works much better.
> 
> René J.V. Bertin wrote:
>     I'd hope that we can avoid the compilation breakages and have no idea of the timescale of planned obsolescence.
>     
>     I'm actually still getting pretty useful backtraces in KDE4 applications; I'd have to see how that works out for Qt5 apps (QtCurve uses kdelibs4support; I could use that to get kbacktraces from pretty "deep" places ;) ).
>     
>     So how does DrKonqi/KF5 work? Doesn't it use equivalent code if not built on kdelibs4support itself?
> 
> David Faure wrote:
>     My problems where in kde4 apps.
>     
>     drkonqi attaches a debugger, it does not use a backtrace function.

Ah, hum, you're right. A debugger which doesn't always return control to drkonqi (when it's lldb), I knew that all too well ...


- René J.V.


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On Dec. 10, 2015, 11:10 p.m., René J.V. Bertin wrote:
> 
> -----------------------------------------------------------
> This is an automatically generated e-mail. To reply, visit:
> https://git.reviewboard.kde.org/r/126309/
> -----------------------------------------------------------
> 
> (Updated Dec. 10, 2015, 11:10 p.m.)
> 
> 
> Review request for KDE Software on Mac OS X and KDE Frameworks.
> 
> 
> Repository: kdelibs4support
> 
> 
> Description
> -------
> 
> This is a "backport" of the patches to `kdebug.cpp` that enable backtrace and demangling support on OS X, FreeBSD and Solaris/OpenIndiana.
> The KDE4 version was discussed here: https://git.reviewboard.kde.org/r/121213/
> 
> It seems that change was never incorporated because of a single open issue for which I never found the time (also given that it seemed a bit overkill).
> 
> My PC-BSD and Indiana VMs are no longer operational; it seems highly likely that the current code still works but if further testing or polishing is required I'll rather remove the specific parts than bring the VMs online again.
> 
> 
> Diffs
> -----
> 
>   src/kdecore/kdebug.cpp 6f04dce 
> 
> Diff: https://git.reviewboard.kde.org/r/126309/diff/
> 
> 
> Testing
> -------
> 
> On Kubuntu 14.04 with various gcc versions and clang; OS X 10.6 - 10.9 with gcc and clang, PC-BSD with clang and on Open Indiana. 
> 
> The KDE4 RR raises some doubts concerning checking for only an OS and not compilers (in demangling). I think there is no reason for such doubts: compilers are obliged to co-exist and be compatible nowadays, at least on individual OS families (each platform will have its own default/dominant compiler that is used to build the system libraries). In practice it turns out that gcc and clang use the same C++ mangling scheme. The only difference is in the way `backtrace_symbols()` formats the stack, and that indeed appears to defined the OS rather than by the compiler used.
> (Then again I'm willing to stand corrected by someone who has a Linux system built from scratch with clang and libc++, or possibly a Gnu/BSD set-up :))
> 
> 
> Thanks,
> 
> René J.V. Bertin
> 
>

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