I'm further along on my goal, but now even more confused.
Benoit's comment about 'plug-ins' sparked the thought that, since my
interest is in midi, not audio, I could try --disable-pcm. This turned out
to be insufficient, but combined with --disable-mixer, alsa-lib now builds
without the -ldl errors.
This turned out to be a small victory, however. When I try to link my
application with the resulting asound library, I'm back to having pthread
and dl undefined references, and also snd_pcm_async among others. The
application only makes 'snd_seq*' calls, but I haven't tried tracing them to
see what they call.
I'll try Benoit's suggestion of creating empty function calls, but my sense
is that I'm missing something obvious.
John
From: Benoit Fouet <benoit.fouet@xxxxxxxxxxxxxx>
To: Takashi Iwai <tiwai@xxxxxxx>
CC: alsa-user@xxxxxxxxxxxxxxxxxxxxx
Subject: Re: alsa-lib: alsa.pc's Libs shouldn't contain
-lm -ldl -lpthread
Date: Tue, 21 Nov 2006 15:07:27 +0100
Takashi Iwai wrote:
> At Tue, 21 Nov 2006 14:47:15 +0100,
> Benoit Fouet wrote:
>
>> Takashi Iwai wrote:
>>
>>> At Tue, 21 Nov 2006 07:34:07 -0600,
>>> r10 kindsofpeople wrote:
>>>
>>>
>>>> First, let me apologize a second time...I thought I had found this
thread on
>>>> Alsa-user, but in fact it was posted to alsa-cvslog. I imagine it
was more
>>>> than a bit confusing without the context of the rest of the thread.
>>>>
>>>> The bulk of that message was:
>>>> -----------------------------------------
>>>> -lm -ldl -lpthread are _not_ needed in Libs (since the alsa interface
>>>> doesn't depend on libm, libdl or libpthread interface) and just bring
>>>> unneeded dependencies. These should rather be put in Libs.private:
>>>>
>>>> Libs: -L${libdir} -lasound
>>>> Libs.private: -lm -ldl -lpthread
>>>>
>>>> See ALSA bug#2212 .
>>>> -----------------------------------------
>>>> and what follows after that was a difference file for making these
changes
>>>> to alsa.pc.in
>>>>
>>>> I'm trying to build the library to run on a uClinux target that
apparently
>>>> does not support libdl. But when I build the alsa library with
>>>> --disable-shared --enable-static it still terminates when it can't
find
>>>> libdl.
>>>>
>>>>
>>> Do you mean the build of alsa-lib itself? Then alsa.pc is
>>> irrelevant. It must be in src/Makefile.am. Try to remove -ldl
>>> there.
>>>
>>>
>> Will that change anything to his problem, though ?
>>
>
> Not sure. I just gave the solution for the missing libdl because he
> never mentioned about the missing _functions_ during compilation.
>
>
>> I mean, won't he need to remove _the code_ that uses dl* functions or,
>> at least, write something to remap dl* functions on functions ? Those
>> would just passes back a fake handle on dlopen, does nothing on
dlclose,
>> and gives back good functions on dlsyms calls.
>> (and if he doesn't use plugins, this should be ok)
>>
>> please tell me if i'm completely lost :)
>>
>
> If the system really provides no wrapper for dl*(), then yes, all
> dl*() should be removed. It would be easy because basically all dl*
> calls are wrapped already by snd_dl*() functions inside alsa-lib.
>
>
> Takashi
>
that's what i thought of, thanks for confirmation :)
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