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Date:      Tue, 15 Nov 2016 11:51:39 -0700
From:      Gary Aitken <freebsd@dreamchaser.org>
To:        FreeBSD Mailing List <freebsd-questions@freebsd.org>
Subject:   Re: gdb / dwarf issue
Message-ID:  <afa0f816-6767-6f2e-4ad4-7bce2b2e5338@dreamchaser.org>
In-Reply-To: <ae0716b6-2f88-f6d1-2500-4fb860fc5b54@dreamchaser.org>
References:  <ae0716b6-2f88-f6d1-2500-4fb860fc5b54@dreamchaser.org>

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On 11/14/16 22:55, Gary Aitken wrote:
> I'm having trouble getting gdb to agree to look at symbols:
> 
> $ cd /usr/ports/graphics/rawtherapee
> $ make showconfig
> ===> The following configuration options are available for rawtherapee-4.2_3:
>      OPENMP=on: Enable multicore processing using OpenMP
>      OPTIMIZED_CFLAGS=off: Use extra compiler optimizations (requires SSE support)
> 
> $ file /usr/local/bin/rawtherapee
> /usr/local/bin/rawtherapee: ELF 64-bit LSB executable, x86-64, version 1 (FreeBSD), dynamically linked, interpreter /libexec/ld-elf.so.1, for FreeBSD 10.3, not stripped
> 
> $ gdb /usr/local/bin/rawtherapee
> GNU gdb 6.1.1 [FreeBSD]
> <snip>
> This GDB was configured as "amd64-marcel-freebsd"...Dwarf Error: wrong version in compilation unit header (is 4, should be 2) [in module /usr/local/bin/rawtherapee]
> (gdb) break main
> No symbol table is loaded.  Use the "file" command.
> 
> My search found implications that a single dependent library with 
> optimization turned on could cause this to happen; is that what I'm
> seeing here, or something else?
> 
> If so, is there an easy way to find out which libraries have compiler 
> optimization turned on that causes this?
> 
> Or do I need to be running something else like the gdb66 port?
> 
> Or?...

now I'm really puzzled:

$ nm /usr/local/bin/rawtherapee | grep main
0000000000c2b45c T KLTCountRemainingFeatures
00000000007fecab t _GLOBAL__sub_I_main.cc
00000000011f76e0 b _ZGVZ4mainE8settings
000000000055516c T _ZN10EditWindow21on_mainNB_switch_pageEP16_GtkNotebookPagej
00000000005da0b8 T _ZN8RTWindow21on_mainNB_switch_pageEP16_GtkNotebookPagej
00000000011f76e8 b _ZZ4mainE8settings
                 U gtk_main_quit
00000000007f8905 T main
00000000011f75e0 B mainThread

$ gdb /usr/local/bin/rawtherapee
GNU gdb 6.1.1 [FreeBSD]
Copyright 2004 Free Software Foundation, Inc.
<snip>
This GDB was configured as "amd64-marcel-freebsd"...Dwarf Error: wrong version in compilation unit header (is 4, should be 2) [in module /usr/local/bin/rawtherapee]

How do I get the right header, or what is the correct gdb to use?

Thanks for any pointers,
Gary



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