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Date: Tue, 01 Jun 2004 15:27:44 +0300

Browse source 
From: Martin_Storsj
Subject: Update for dynamic loading of ALSA

I sent you a patch a few months ago which enables SDL to load ALSA
dynamically. Now I've finally got time to tweak this yet some more. I've
added code from alsa.m4 (from alsa's dev package) to acinclude.m4, and
made the detection of the alsa library name a bit better. I've also
fixed up the loading versioned symbols with dlvsym, so that it falls
back to dlsym.

I wouldn't say the configure script is complete yet, but this is how far
I've come this time, and I'm no expert at those things.

--HG--
extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%40940
This commit is contained in:
Sam Lantinga 2004-08-21 04:20:00 +00:00
parent 1d9ee0370f
commit b3fa599851
3 changed files with 184 additions and 17 deletions
Download patch file Download diff file Expand all files Collapse all files

48
configure.in
View file

@ -282,39 +282,53 @@ CheckALSA()
[ --enable-alsa support the ALSA audio API [default=yes]],
, enable_alsa=yes)
if test x$enable_audio = xyes -a x$enable_alsa = xyes; then
AC_MSG_CHECKING(for ALSA audio support)
have_alsa=no
AC_TRY_COMPILE([
#include <alsa/asoundlib.h>
],[
#if SND_LIB_VERSION < ((0<<16)|(9<<8)|0)
#error Your version of ALSA is too old
#endif
snd_pcm_t *pcm_handle;
],[
AC_CHECK_LIB(asound, snd_pcm_open, have_alsa=yes)
])
AM_PATH_ALSA(0.9.0, have_alsa=yes)
if test x$have_alsa = xyes; then
AC_ARG_ENABLE(alsa-shared,
[ --enable-alsa-shared dynamically load ALSA audio support [default=yes]],
, enable_alsa_shared=yes)
alsa_lib=`ls /usr/lib/libasound.so.* | sed 's/.*\/\(.*\)/\1/; q'`
if test "x`echo $ALSA_LIBS | grep -- -L`" = "x"; then
if test "x`ls /usr/lib/libasound.so.* 2> /dev/null`" != "x"; then
ALSA_LIBS="-L/usr/lib $ALSA_LIBS"
else if test "x`ls /usr/local/lib/libasound.so.* 2> /dev/null`" != "x"; then
ALSA_LIBS="-L/usr/local/lib $ALSA_LIBS"
fi; fi
fi
alsa_lib_spec=`echo $ALSA_LIBS | sed 's/.*-L\([[^ ]]*\).*/\1\/libasound.so.*/'`
alsa_lib=`ls $alsa_lib_spec | sed 's/.*\/\(.*\)/\1/; q'`
echo "-- $alsa_lib_spec -> $alsa_lib"
if test x$use_dlopen != xyes && \
test x$enable_alsa_shared = xyes; then
AC_MSG_ERROR([You must have dlopen() support and use the --enable-dlopen option])
fi
if test x$use_dlopen = xyes && \
test x$enable_alsa_shared = xyes && test x$alsa_lib != x; then
CFLAGS="$CFLAGS -DALSA_SUPPORT -DALSA_DYNAMIC=\$(alsa_lib)"
CFLAGS="$CFLAGS -DALSA_SUPPORT -DALSA_DYNAMIC=\$(alsa_lib) $ALSA_CFLAGS"
AC_SUBST(alsa_lib)
AC_MSG_CHECKING(for dlvsym)
use_dlvsym=no
AC_TRY_COMPILE([
#include <stdio.h>
#define __USE_GNU
#include <dlfcn.h>
],[
dlvsym(NULL,"","");
],[
use_dlvsym=yes
])
AC_MSG_RESULT($use_dlvsym);
if test x$use_dlvsym = xyes; then
CFLAGS="$CFLAGS -DUSE_DLVSYM"
fi
else
CFLAGS="$CFLAGS -DALSA_SUPPORT"
SYSTEM_LIBS="$SYSTEM_LIBS -lasound"
CFLAGS="$CFLAGS -DALSA_SUPPORT $ALSA_CFLAGS"
SYSTEM_LIBS="$SYSTEM_LIBS $ALSA_LIBS"
fi
AUDIO_SUBDIRS="$AUDIO_SUBDIRS alsa"
AUDIO_DRIVERS="$AUDIO_DRIVERS alsa/libaudio_alsa.la"
else
AC_MSG_RESULT($have_alsa)
fi
fi
}