[cfe-dev] Effectively Debugging Clang

[Amila Jayasekara]

On Thu, Oct 2, 2014 at 5:17 AM, Csaba Raduly <rcsaba at gmail.com> wrote:

> Hi,
>
> What compiler do you use to build clang?


Well.. I am using Clang to build clang. Specific version is as follows;

[~]>clang -v

Apple LLVM version 5.1 (clang-503.0.38) (based on LLVM 3.4svn)

Target: x86_64-apple-darwin13.4.0

Thread model: posix
Thanks
-Thejaka


> Older versions of GDB (7.2,
> 7.4) had problems understanding objects (or the debug info) created by
> GCC 4.8 and higher (typical symptom: none of the local variables were
> visible to the debugger).
>
> GDB 7.7 (on Linux) seems to be better, but I switched to the latest
> gdb 7.8 anyway, built from sources.
>
> Csaba
>
> On Thu, Oct 2, 2014 at 7:10 AM, Amila Jayasekara
> <thejaka.amila at gmail.com> wrote:
> > Hi David,
> >
> > I am using 7.7.1.
> >
> > Thanks
> > -Thejaka
> >
> > On Wed, Oct 1, 2014 at 11:13 AM, David Blaikie <dblaikie at gmail.com>
> wrote:
> >>
> >>
> >>
> >> On Tue, Sep 30, 2014 at 10:34 AM, Amila Jayasekara
> >> <thejaka.amila at gmail.com> wrote:
> >>>
> >>> Hello,
> >>>
> >>> I am having a more general question related to debugging clang.
> >>>
> >>> I start gdb (in MacOS) as follows;
> >>>
> >>> >ggdb clang++
> >>> ....
> >>> ....
> >>> (ggdb) run -cc1 -std=c++11 -stdlib=libc++
> >>>
> -I/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/c++/v1
> >>> test1.cpp
> >>>
> >>> In most of the time during debugging session I am unable to evaluate
> and
> >>> print values of a certain variable. Sometimes my debugger freezes for
> long
> >>> time, sometime i get a segmentation faults.
> >>>
> >>> For example if I execute following on a  QualType variable I get a
> >>> segmentation fault.
> >>>
> >>> (gdb) p FnRetType.getAsString()
> >>> line 1: 39759 Segmentation fault: 11  ggdb
> >>> /Users/thejaka/development/crest/pxc/llvm/350/Debug+Asserts/bin/clang++
> >>>
> >>> So my question is, what are the techniques you use to effectively debug
> >>> clang ? and how can I overcome crashes like above ?
> >>
> >>
> >>  I debug Clang and LLVM on Linux using gdb all the time. Which version
> of
> >> gdb are you using?
> >>
> >>>
> >>>
> >>> Your feedback is greatly appreciated.
> >>>
> >>> Thank you
> >>> Regards
> >>> Thejaka Amila
> >>>
> >>>
> >>>
> >>> _______________________________________________
> >>> cfe-dev mailing list
> >>> cfe-dev at cs.uiuc.edu
> >>> http://lists.cs.uiuc.edu/mailman/listinfo/cfe-dev
> >>>
> >>
> >
> >
> > _______________________________________________
> > cfe-dev mailing list
> > cfe-dev at cs.uiuc.edu
> > http://lists.cs.uiuc.edu/mailman/listinfo/cfe-dev
> >
>
>
>
> --
> GCS a+ e++ d- C++ ULS$ L+$ !E- W++ P+++$ w++$ tv+ b++ DI D++ 5++
> The Tao of math: The numbers you can count are not the real numbers.
> Life is complex, with real and imaginary parts.
> "Ok, it boots. Which means it must be bug-free and perfect. " -- Linus
> Torvalds
> "People disagree with me. I just ignore them." -- Linus Torvalds
>
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