[Pkg-alsa-devel] Bug#522544: libasound2-dev: Statically linking libasound.a does not work

[Samuel Thibault]

Package: libasound2-dev
Version: 1.0.19-1
Severity: normal

Hello,

So as to include sound support in the debian installer for speech
synthesis support but save space, I am trying to link libasound.a
statically.  This however does not work: at runtime,
snd_dlsym("_snd_ctl_hw_open") fails, and indeed

$ nm /usr/lib/libasound.a  | grep _snd_ctl_hw_open
0000000000000001 C __snd_ctl_hw_open_dlsym_control_001
00000000000007a0 T _snd_ctl_hw_open

The _snd_dlsym_constructor__snd_ctl_hw_open_dlsym_control_001
constructor that adds the symlink does not exist.  That is because of
the way things are built, see this exerpt of the buildd log:

/bin/sh ../../libtool --tag=CC   --mode=compile gcc -m32 -DHAVE_CONFIG_H -I. -I../../../src/control -I../../include -I../../../include    -g -Wall -O2 -MT control_hw.lo -MD -MP -MF .deps/control_hw.Tpo -c -o control_hw.lo ../../../src/control/control_hw.c
 gcc -m32 -DHAVE_CONFIG_H -I. -I../../../src/control -I../../include -I../../../include -g -Wall -O2 -MT control_hw.lo -MD -MP -MF .deps/control_hw.Tpo -c ../../../src/control/control_hw.c  -fPIC -DPIC -o .libs/control_hw.o
 gcc -m32 -DHAVE_CONFIG_H -I. -I../../../src/control -I../../include -I../../../include -g -Wall -O2 -MT control_hw.lo -MD -MP -MF .deps/control_hw.Tpo -c ../../../src/control/control_hw.c -o control_hw.o >/dev/null 2>&1
mv -f .deps/control_hw.Tpo .deps/control_hw.Plo

...

/bin/sh ../../libtool --tag=CC   --mode=link gcc -m32  -g -Wall -O2   -o libcontrol.la  cards.lo tlv.lo namehint.lo hcontrol.lo control.lo control_hw.lo setup.lo control_symbols.lo control_shm.lo control_ext.lo
ar cru .libs/libcontrol.a .libs/cards.o .libs/tlv.o .libs/namehint.o .libs/hcontrol.o .libs/control.o .libs/control_hw.o .libs/setup.o .libs/control_symbols.o .libs/control_shm.o .libs/control_ext.o
ranlib .libs/libcontrol.a
creating libcontrol.la

The non-PIC object is built but there no .a including is built.  Later on, the creation of libasound.a:

rm -fr .libs/libasound.lax/libcontrol.a
mkdir .libs/libasound.lax/libcontrol.a
(cd .libs/libasound.lax/libcontrol.a && ar x /build/buildd/alsa-lib-1.0.19/bibuild/src/control/.libs/libcontrol.a)

ar cru .libs/libasound.a  conf.o confmisc.o input.o output.o async.o error.o dlmisc.o socket.o shmarea.o userfile.o names.o  .libs/libasound.lax/libcontrol.a/namehint.o .libs/libasound.lax/libcontrol.a/control_symbols.o .libs/libasound.lax/libcontrol.a/control_shm.o .libs/libasound.lax/libcontrol.a/tlv.o .libs/libasound.lax/libcontrol.a/setup.o .libs/libasound.lax/libcontrol.a/control_hw.o .libs/libasound.lax/libcontrol.a/cards.o .libs/libasound.lax/libcontrol.a/hcontrol.o .libs/libasound.lax/libcontrol.a/control_ext.o .libs/libasound.lax/libcontrol.a/control.o  .libs/libasound.lax/libmixer.a/simple_abst.o .libs/libasound.lax/libmixer.a/simple.o .libs/libasound.lax/libmixer.a/mixer.o .libs/libasound.lax/libmixer.a/simple_none.o .libs/libasound.lax/libmixer.a/bag.o  .libs/libasound.lax/libpcm.a/pcm_empty.o .libs/libasound.lax/libpcm.a/pcm_multi.o .libs/libasound.lax/libpcm.a/pcm_generic.o .libs/libasound.lax/libpcm.a/pcm_hw.o .libs/libasound.lax/libpcm.a/pcm_route.o .libs/libasound.lax/libpcm.a/pcm_symbols.o .libs/libasound.lax/libpcm.a/interval.o .libs/libasound.lax/libpcm.a/pcm_copy.o .libs/libasound.lax/libpcm.a/pcm_extplug.o .libs/libasound.lax/libpcm.a/pcm_null.o .libs/libasound.lax/libpcm.a/pcm_simple.o .libs/libasound.lax/libpcm.a/pcm_rate.o .libs/libasound.lax/libpcm.a/pcm_plugin.o .libs/libasound.lax/libpcm.a/pcm_ioplug.o .libs/libasound.lax/libpcm.a/pcm_mulaw.o .libs/libasound.lax/libpcm.a/pcm_iec958.o .libs/libasound.lax/libpcm.a/pcm_file.o .libs/libasound.lax/libpcm.a/pcm_linear.o .libs/libasound.lax/libpcm.a/pcm_misc.o .libs/libasound.lax/libpcm.a/pcm_lfloat.o .libs/libasound.lax/libpcm.a/pcm_asym.o .libs/libasound.lax/libpcm.a/pcm_dmix.o .libs/libasound.lax/libpcm.a/pcm_params.o .libs/libasound.lax/libpcm.a/pcm_hooks.o .libs/libasound.lax/libpcm.a/pcm_shm.o .libs/libasound.lax/libpcm.a/pcm_rate_linear.o .libs/libasound.lax/libpcm.a/atomic.o .libs/libasound.lax/libpcm.a/pcm.o .libs/libasound.lax/libpcm.a/pcm_softvol.o .libs/libasound.lax/libpcm.a/pcm_direct.o .libs/libasound.lax/libpcm.a/pcm_ladspa.o .libs/libasound.lax/libpcm.a/pcm_mmap.o .libs/libasound.lax/libpcm.a/pcm_dshare.o .libs/libasound.lax/libpcm.a/mask.o .libs/libasound.lax/libpcm.a/pcm_meter.o .libs/libasound.lax/libpcm.a/pcm_alaw.o .libs/libasound.lax/libpcm.a/pcm_mmap_emul.o .libs/libasound.lax/libpcm.a/pcm_share.o .libs/libasound.lax/libpcm.a/pcm_adpcm.o .libs/libasound.lax/libpcm.a/pcm_plug.o .libs/libasound.lax/libpcm.a/pcm_dsnoop.o  .libs/libasound.lax/libtimer.a/timer_symbols.o .libs/libasound.lax/libtimer.a/timer_query_hw.o .libs/libasound.lax/libtimer.a/timer.o .libs/libasound.lax/libtimer.a/timer_hw.o .libs/libasound.lax/libtimer.a/timer_query.o  .libs/libasound.lax/librawmidi.a/rawmidi.o .libs/libasound.lax/librawmidi.a/rawmidi_hw.o .libs/libasound.lax/librawmidi.a/rawmidi_symbols.o .libs/libasound.lax/librawmidi.a/rawmidi_virt.o  .libs/libasound.lax/libhwdep.a/hwdep_symbols.o .libs/libasound.lax/libhwdep.a/hwdep_hw.o .libs/libasound.lax/libhwdep.a/hwdep.o  .libs/libasound.lax/libseq.a/seq.o .libs/libasound.lax/libseq.a/seq_midi_event.o .libs/libasound.lax/libseq.a/seq_hw.o .libs/libasound.lax/libseq.a/seq_symbols.o .libs/libasound.lax/libseq.a/seq_event.o .libs/libasound.lax/libseq.a/seqmid.o .libs/libasound.lax/libseq.a/seq_old.o  .libs/libasound.lax/libalisp.a/alisp.o  .libs/libasound.lax/libcompat.a/empty.o
ranlib .libs/libasound.a
rm -fr .libs/libasound.lax
creating libasound.la

uses the PIC-compiled object, not the non-PIC-compiled one, thus the
non-existence of the constructor.

I'm far from at ease with libtool, is that a know bug, or perhaps a
missing bit in the alsa-lib Makefile.am?

Samuel

-- System Information:
Debian Release: squeeze/sid
  APT prefers testing
  APT policy: (990, 'testing'), (500, 'unstable'), (500, 'stable'), (1, 'experimental')
Architecture: amd64 (x86_64)

Kernel: Linux 2.6.29 (SMP w/2 CPU cores)
Locale: LANG=fr_FR.UTF-8, LC_CTYPE=fr_FR.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash

Versions of packages libasound2-dev depends on:
ii  libasound2                    1.0.19-1   shared library for ALSA applicatio
ii  libc6-dev [libc-dev]          2.9-4      GNU C Library: Development Librari

libasound2-dev recommends no packages.

Versions of packages libasound2-dev suggests:
pn  libasound2-doc                <none>     (no description available)

-- no debconf information

-- 
Samuel
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