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David A. Bardsley

2016-Apr-29 23:13 UTC

[opus] libopus cross compile for bf537 runtime error releated to "-lopus"

Hello all!

I'm having trouble with a cross compiled libopus for an embedded 
application and would like some help.

preamble:
     embedded details:
         processor: bf537
         kernel: Linux release 3.0.8-ADI-2011R1-svn4693, build #2834 Fri 
Apr 22 12:35:34 ADT 2016
         toolchain: bfin-linux-uclibc-gcc release gcc version 4.3.5 
(ADI-2011R1-RC4)
         audio interface: ALSA
     opus:
         version: 1.1.2
         build process:
             export 
CC=/opt/uClinux/bfin-linux-uclibc/bin/bfin-linux-uclibc-gcc
             export CFLAGS=-funroll-loops\ -ffast-math\ -mfast-fp\ 
-DFLOAT_APPROX\ -O3
             export LDFLAGS=-isystem\ 
/home/dab/Pantel/svn/blackfin_env/2011r1/main/blackfin-linux-dist/staging/usr/include\
-L/home/dab/Pantel/svn/blackfin_env/2011r1/main/blackfin-linux-dist/staging/usr/lib
             export 
STRIP=/opt/uClinux/bfin-linux-uclibc/bin/bfin-linux-uclibc-strip
             ./configure --enable-fixed-point --host=blackfin
             make

After populating the headers and library to the needed staging areas the 
appplication build appears to run fine.  When the program executes, 
after only having the library linked during the make (LDFLAGS += 
-lopus), the ALSA setup becomes very upse at run time:

ALSA lib 
/home/dab/Pantel/svn/blackfin_env/2011r1/main/blackfin-linux-dist/lib/alsa-lib/alsa-lib-1.0.24/src/dlmisc.c:124:(snd_dlsym_verify)
unable to verify version for symbol _snd_ctl_hw_open
ALSA lib 
/home/dab/Pantel/svn/blackfin_env/2011r1/main/blackfin-linux-dist/lib/alsa-lib/alsa-lib-1.0.24/src/dlmisc.c:246:(snd1_dlobj_cache_get)
symbol _snd_ctl_hw_open is not defined inside [builtin]
ALSA lib 
/home/dab/Pantel/svn/blackfin_env/2011r1/main/blackfin-linux-dist/lib/alsa-lib/alsa-lib-1.0.24/src/confmisc.c:674:(snd_determine_driver)
could not open control for card 0
ALSA lib 
/home/dab/Pantel/svn/blackfin_env/2011r1/main/blackfin-linux-dist/lib/alsa-lib/alsa-lib-1.0.24/src/conf.c:3326:(snd_config_hooks_call)
function snd_config_hook_load_for_all_cards returned error: No such 
device or address
ALSA lib 
/home/dab/Pantel/svn/blackfin_env/2011r1/main/blackfin-linux-dist/lib/alsa-lib/alsa-lib-1.0.24/src/dlmisc.c:124:(snd_dlsym_verify)
unable to verify version for symbol _snd_ctl_hw_open
ALSA lib 
/home/dab/Pantel/svn/blackfin_env/2011r1/main/blackfin-linux-dist/lib/alsa-lib/alsa-lib-1.0.24/src/dlmisc.c:246:(snd1_dlobj_cache_get)
symbol _snd_ctl_hw_open is not defined inside [builtin]
ALSA lib 
/home/dab/Pantel/svn/blackfin_env/2011r1/main/blackfin-linux-dist/lib/alsa-lib/alsa-lib-1.0.24/src/confmisc.c:674:(snd_determine_driver)
could not open control for card 0
ALSA lib 
/home/dab/Pantel/svn/blackfin_env/2011r1/main/blackfin-linux-dist/lib/alsa-lib/alsa-lib-1.0.24/src/conf.c:4184:(_snd_config_evaluate)
function snd_func_card_driver returned error: No such device or address
ALSA lib 
/home/dab/Pantel/svn/blackfin_env/2011r1/main/blackfin-linux-dist/lib/alsa-lib/alsa-lib-1.0.24/src/confmisc.c:392:(snd_func_concat)
error evaluating strings
ALSA lib 
/home/dab/Pantel/svn/blackfin_env/2011r1/main/blackfin-linux-dist/lib/alsa-lib/alsa-lib-1.0.24/src/conf.c:4184:(_snd_config_evaluate)
function snd_func_concat returned error: No such device or address
ALSA lib 
/home/dab/Pantel/svn/blackfin_env/2011r1/main/blackfin-linux-dist/lib/alsa-lib/alsa-lib-1.0.24/src/confmisc.c:1251:(snd_func_refer)
error evaluating name
ALSA lib 
/home/dab/Pantel/svn/blackfin_env/2011r1/main/blackfin-linux-dist/lib/alsa-lib/alsa-lib-1.0.24/src/conf.c:4184:(_snd_config_evaluate)
function snd_func_refer returned error: No such device or address
ALSA lib 
/home/dab/Pantel/svn/blackfin_env/2011r1/main/blackfin-linux-dist/lib/alsa-lib/alsa-lib-1.0.24/src/conf.c:4663:(snd_config_expand)
Evaluate error: No such device or address
ALSA lib 
/home/dab/Pantel/svn/blackfin_env/2011r1/main/blackfin-linux-dist/lib/alsa-lib/alsa-lib-1.0.24/src/pcm/pcm.c:2212:(snd_pcm_open_noupdate)
Unknown PCM cards.pcm.default

Simply adding/removing the LDFLAGS member -lopus causes/removes the 
complaints at run time.  To be clear simply commenting out "LDFLAGS += 
-lopus" from the make file silences the complaints.

Where have I gone astray?  Am I making a huge blunder during the library 
cross compile and somehow smashing my ALSA?  I should note that when I 
perform a straight-up build for my appllication for my i7 GNU/Linux 
machine (the build environment) the application works fine (the library 
linking and then somthing useful as well) so clearly I've broken the 
cross compile or link somehow.

Any assistance in pointing me to where I may have gone astray would be 
greatly apprecieated.

Dave

-- 
David A. Bardsley | Electrical Engineer
*Pantel International* |
125 Joseph Zatzman Drive | Dartmouth, Nova Scotia | B3B 1W1
Phone: (902)468-5998 | Fax: (902)468-6577
pantelintl.com <http://pantelintl.com/>

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Timothy B. Terriberry

2016-Apr-29 23:46 UTC

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[opus] libopus cross compile for bf537 runtime error releated to "-lopus"

David A. Bardsley wrote:> ALSA lib
>
/home/dab/Pantel/svn/blackfin_env/2011r1/main/blackfin-linux-dist/lib/alsa-lib/alsa-lib-1.0.24/src/dlmisc.c:124:(snd_dlsym_verify)
> unable to verify version for symbol _snd_ctl_hw_open
I don't at all claim to have any knowledge of ALSA, and I have no idea 
why linking against libopus triggers this problem, but 
<http://www.openwall.com/lists/sabotage/2014/11/15/6> suggests the cause 
may be that the linker is dropping the symbol versioning marker symbols 
because they are otherwise unreferenced, and that using ALSA version 
1.0.29 or later would avoid this problem (if built with 
--without-versioning). Similarly, 
<https://forums.gentoo.org/viewtopic-t-693166-start-0.html> suggests 
that using version 1.0.14_rc3 or earlier would, too.

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