From mboxrd@z Thu Jan  1 00:00:00 1970
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Date: Wed, 01 Feb 2012 16:38:25 +0100
From: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
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Subject: Re: [Xenomai-core] Built-in libxenomai dependency
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To: Jan Kiszka <jan.kiszka@domain.hid>
Cc: xenomai-core <xenomai@xenomai.org>

On 02/01/2012 04:25 PM, Jan Kiszka wrote:
> On 2012-02-01 16:17, Gilles Chanteperdrix wrote:
>> On 02/01/2012 03:37 PM, Jan Kiszka wrote:
>>> Hi,
>>>
>>> don't remember anymore: Is there any subtle reason that prevent a
>>> change like
>>>
>>> diff --git a/src/skins/native/Makefile.am b/src/skins/native/Makefile.am
>>> index 39eaaed..4cc8859 100644
>>> --- a/src/skins/native/Makefile.am
>>> +++ b/src/skins/native/Makefile.am
>>> @@ -22,6 +22,9 @@ libnative_la_SOURCES = \
>>>  	wrappers.c \
>>>  	wrappers.h
>>>  
>>> +libnative_la_LIBADD = \
>>> +	../common/libxenomai.la
>>> +
>>>  libnative_la_CPPFLAGS = \
>>>  	@XENO_USER_CFLAGS@ \
>>>  	-I$(top_srcdir)/include
>>> diff --git a/src/skins/rtdm/Makefile.am b/src/skins/rtdm/Makefile.am
>>> index 8ad74be..2dc0a90 100644
>>> --- a/src/skins/rtdm/Makefile.am
>>> +++ b/src/skins/rtdm/Makefile.am
>>> @@ -8,6 +8,9 @@ librtdm_la_SOURCES = \
>>>  	core.c \
>>>  	init.c
>>>  
>>> +librtdm_la_LIBADD = \
>>> +	../common/libxenomai.la
>>> +
>>>  librtdm_la_CPPFLAGS = \
>>>  	@XENO_USER_CFLAGS@ \
>>>  	-I$(top_srcdir)/include
>>> diff --git a/src/testsuite/latency/Makefile.am b/src/testsuite/latency/Makefile.am
>>> index c772c26..6534df5 100644
>>> --- a/src/testsuite/latency/Makefile.am
>>> +++ b/src/testsuite/latency/Makefile.am
>>> @@ -14,5 +14,4 @@ latency_LDFLAGS = @XENO_USER_LDFLAGS@
>>>  latency_LDADD = \
>>>  	../../skins/native/libnative.la \
>>>  	../../skins/rtdm/librtdm.la \
>>> -	../../skins/common/libxenomai.la \
>>>  	-lpthread -lm
>>>
>>> i.e. that we let the skin libraries depend on libxenomai and then remove
>>> the explicit dependency from our binaries and the xeno-config output?
>>> Is there some ordering issue again (we have -l<skin> before -lxenomai
>>> in the ldflags).
>>>
>>> If possible, this would allow for things like dlopen("libnative.so").
>>
>> It allows xeno-config result to work both with dynamic and static
>> libraries. Static libraries have no dependency system, so, when linking
>> a program whith libnative.a for instance, without libtool, you still
>> have to link it with libxenomai.a.
> 
> OK, part two could stay, but the dependencies should still be added to
> the skin libs - if possible.
> 
>>
>> How come you can not dlopen libnative.so, dlopening libxenomai.so before
>> does not work?
> 
> Dependencies of libnative on libxenomai are not resolved when you open
> the former even if the latter is already loaded. Maybe you can do this
> by pulling in all required symbols one by one manually, haven't tried
> yet. But that would at least be unhandy.

What about RTLD_GLOBAL ?

-- 
					    Gilles.