On 2011-07-28 18:56, Jan Kiszka wrote:
> On 2011-07-27 20:49, Gilles Chanteperdrix wrote:
>> On 07/22/2011 05:04 PM, Jan Kiszka wrote:
>>> Hi Gilles,
>>>
>>> pulling assert_context.c into the common libxenomai created a problem
>>> around picking the right __wrap_clock_gettime. As libpthread_rt depends
>>> on libxenomai, the latter is loaded first and defines the debug version
>>> of __wrap_clock_gettime as the default. There is no chance to pull the
>>> posix skin implementation.
>>>
>>> I don't have a nice idea yes how to resolve this. Options are:
>>>  - drop __wrap_clock_gettime from assert_context.c (affects any skin
>>>    user != posix)
>>>  - put assert_context stuff into separate library again
>>>  - put __wrap_clock_gettime in all skin libs != posix
>>>
>>> I'm favoring the simplest approach ATM, ie. the first one. Other ideas?
>>
>> I agree, but I would have thought __attriibute__((weak)) takes care of
>> this issue.
> 
> The point is that once you have pulled in that weak symbol into a
> process, the dynamic loader won't update it if a non-weak version is
> pulled in via dlopen.

Mmh, maybe we have a fourth option: disabling the weak version if
CONFIG_XENO_LIBS_DLOPEN is set. OTOH, the correlation may not be obvious
to users. So that result could be even more confusing.

Jan

-- 
Siemens AG, Corporate Technology, CT T DE IT 1
Corporate Competence Center Embedded Linux

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