[Developers] debugging issues; -g is now useless with gdb

[Johnoel Ancheta]

Unable to produce the no symbol error on Fedora
19<http://distrowatch.com/table.php?distribution=fedora>
.

Seem to just work with no modifications.


On Sun, Feb 23, 2014 at 10:22 AM, John Sibert <sibert at hawaii.edu> wrote:

> Perhaps.
>
> I have
> $ gdb --version
> GNU gdb (Ubuntu/Linaro 7.4-2012.04-0ubuntu2.1) 7.4-2012.04
>
> But
> https://www.sourceware.org/gdb/
> announced
> February 6th, 2014: *GDB 7.7 Released!*
> The latest version of GDB, version 7.7, is available for download <
> https://www.sourceware.org/gdb/download/>.
>
>
>
> John Sibert
> Emeritus Researcher, SOEST
> University of Hawaii at Manoa
> Honolulu HI (GMT-10)
> 808-294-3842
>
> Visit the ADMB project http://admb-project.org/
>
> On 02/22/2014 08:11 PM, Johnoel Ancheta wrote:
>
>> Does gdb just need to be updated?
>>
>>
>> On Sat, Feb 22, 2014 at 4:21 PM, John Sibert <sibert at hawaii.edu <mailto:
>> sibert at hawaii.edu>> wrote:
>>
>>     Starting with gcc-4.8 (or perhaps gcc-4.7) the compiler does not
>>     generate debugging information that is completely compatible with
>>     gdb. As a result the message "No symbol 'foo' in current context."
>>     is emitted every time an attempt is made to print or display a
>>     variable. Searching on the message yields a lot of useless advice
>>     about suppressing optimization. While is this advice is more or
>>     less correct, it does not eliminate the message or permit
>>     examining a variable. After a lot of further searching on
>>     stackoverflow, the solution is apparently to replace -g or -ggdb
>>     with "-g -gdwarf-2". Further farting around will reveal whether
>>     both -g and -gdwarf-2 are necessary. (Reverting to gcc-4.6.3 also
>>     solves the problem, but seems dumb.)
>>
>>     The ADMB make scripts for gcc use -ggdb and will not produce the
>>     desired result.
>>
>>     Also, IMHO, there is no point in compiling with both the OPT_LIB
>>     macro and the debug flags. It won't tell you where you walked out
>>     of an array in the optimized libraries. If you want to debug
>>     something use the safe libraries.
>>
>>     John
>>
>>     --     John Sibert
>>     Emeritus Researcher, SOEST
>>     University of Hawaii at Manoa
>>     Honolulu HI (GMT-10)
>>     808-294-3842 <tel:808-294-3842>
>>
>>
>>     Visit the ADMB project http://admb-project.org/
>>
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>>
>>
>>
>
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