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

[David Faure]

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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.

- David Faure


On Dec. 10, 2015, 10:10 p.m., René J.V. Bertin wrote:
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> This is an automatically generated e-mail. To reply, visit:
> https://git.reviewboard.kde.org/r/126309/
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> (Updated Dec. 10, 2015, 10:10 p.m.)
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> Review request for KDE Software on Mac OS X and KDE Frameworks.
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> Repository: kdelibs4support
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> Description
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> 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/
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> 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).
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> 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.
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> Diffs
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>   src/kdecore/kdebug.cpp 6f04dce 
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> Diff: https://git.reviewboard.kde.org/r/126309/diff/
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> Testing
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> 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. 
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> 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 :))
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> Thanks,
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> René J.V. Bertin
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