Re: [Xenomai] How to get debug symbols in xenomai libraries

[Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>]

On 09/05/2014 11:25 PM, Paul wrote:
> On Friday 05 September 2014, Gilles Chanteperdrix wrote:
>> On 09/05/2014 11:15 PM, Lennart Sorensen wrote:
>>> On Fri, Sep 05, 2014 at 11:04:35PM +0200, Gilles Chanteperdrix 
> wrote:
>>>> On 09/05/2014 11:03 PM, Lennart Sorensen wrote:
>>>>> On Fri, Sep 05, 2014 at 10:57:10PM +0200, Gilles Chanteperdrix 
> wrote:
>>>>>> On 09/05/2014 10:54 PM, Lennart Sorensen wrote:
>>>>>>> On Fri, Sep 05, 2014 at 10:31:35PM +0200, Gilles Chanteperdrix 
> wrote:
>>>>>>>> Just tried a fresh build with minimal flags, simply:
>>>>>>>>
>>>>>>>> configure --enable-debug CFLAGS="-fomit-frame-pointer"
>>>>>>>> --host=arm-linux-gnueabihf
>>>>>>>> make
>>>>>>>> arm-linux-gnueabihf-gdb
>>>>>>>> src/skins/common/.libs/libxenomai.so.0.0.0
>>>>>>>>
>>>>>>>> and gdb says it can find symbols. (-fomit-frame-pointer is
>>>>>>>> needed with the toolchain I use, otherwise gcc complains that
>>>>>>>> it can not use the r7 register).
>>>>>>>
>>>>>>> I tried adding that option, and still gdb says no symbols.
>>>>>>>
>>>>>>> Toolchain is debian wheezy's gcc 4.6, and everything is
>>>>>>> natively compiled.
>>>>>>
>>>>>> Do you build the package manually, like I just did? Or do you
>>>>>> use the debian/rules stuff?
>>>>>
>>>>> I use the debian/rules, but I set
>>>>> DEB_CFLAGS_APPEND=-fomit-frame-pointer and I added --enable-debug
>>>>> to the configure line in debian/rules and I set
>>>>> DEB_BUILD_OPTIONS=nostrip
>>>>
>>>> Could you try a manual build?
>>>
>>> That makes installing such a pain and the gcc lines had all the
>>> right arguments (-g -fomit-frame-pointer etc).  And we did want to
>>> debug with as close to the normal runtime build as possible.
>>
>> You do not need to run "make install"
>> Just run configure --enable-debug
>> Then make
>> Then try gdb on the compiled libxenomai.so.0.0.0
>>
>> There are two layers of Makefileries, thee aim is to find where the
>> problem is coming from, not to use this as a solution.
> 
> dh_strip in debian/rules is the guilty party here - It is responsible 
> for stripping debug symbols from binary executables and libraries.

I am not sure this is the issue, since Lennart passes the "nostrip"
directive, and says that the file utility says that the libraries are
not stripped.

Anyway, packages like libc6 have debug symbols in a separate package
from the main binary package. Is this complicated to achieve?


-- 
                                                                Gilles.