[Bug c++/14999] Clang debug info crashes GDB when trying to collectlocal variables in a trace

["tromey at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=14999

--- Comment #5 from Tom Tromey <tromey at redhat dot com> 2013-01-08 04:26:54 UTC ---
(In reply to comment #4)
> Created attachment 6801 [details]
> x86 assembly for trace.c from Clang with frame pointers
> 
> Since you mentioned something about frames, that reminded me that Clang does
> tend to be a bit conservative about frame pointers - so I thought I should
> mention/demonstrate (in case it's relevant) that this bug does still reproduce
> when I force Clang to emit frame pointers.

It isn't about frame pointers but about the DW_AT_frame_base.
GCC usually uses DW_OP_call_frame_cfa.
clang is emitting

    <41>   DW_AT_frame_base  : 1 byte block: 56     (DW_OP_reg6 (rbp))

The DWARF->AX translator was mishandling this -- just an oversight there.
I have a patch, and it works; I just need to turn the .s into
a test case.

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