gcc build with -O0 results in corrupted -debuginfo package

[Petr Spacek]

On 25.4.2014 16:28, Reindl Harald wrote:
>
> Am 25.04.2014 16:10, schrieb Petr Spacek:
>> I'm trying to rebuild bind-9.9.4-12.P2.fc20.src.rpm with
>> CFLAGS="$CFLAGS $RPM_OPT_FLAGS -O0 -ggdb".
>>
>> I did the simplest possible thing - edited the original spec file (see spec.diff) and built the package:
>> $ rpmbuild -ba bind.spec
>>
>> The package builds and BIND itself seems to work. The problem is that new debuginfo package is missing 118 out of
>> 283 header files in /usr/src/debug/bind-9.9.4-P2.
>>
>> It seems that "-O0" alone (instead of "-O0 -ggdb") causes the same problem.
>>
>> I would be glad if anyone can give me advice how to debug this.
>>
>> Original packages from Fedora 20 (with all headers in /usr/src/debug):
>> http://koji.fedoraproject.org/koji/buildinfo?buildID=502596
>>
>> Packages built with -O0 -ggdb (scratch build):
>> http://koji.fedoraproject.org/koji/taskinfo?taskID=6778483
>
> just don't do that
I'm going to reproduce and debug issue in named. Do you see any specific 
reason why I should use -O2 for serious debugging/development sessions?

 > and read compiler warnings
Thank you very much for your very helpful advice! :-)

> the debuginfo package is your smallest problem
I'm afraid it is not.

> you just kill security features like D_FORTIFY_SOURCE with -O0
>
> warning: #warning _FORTIFY_SOURCE requires compiling with optimization (-O) [-Wcpp]
I think my use case justifies it.

-- 
Petr^2 Spacek