/usr/share/aclocal/alsa.m4 is in libasound2-dev 1.1.0-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 | dnl Configure Paths for Alsa
dnl Some modifications by Richard Boulton <richard-alsa@tartarus.org>
dnl Christopher Lansdown <lansdoct@cs.alfred.edu>
dnl Jaroslav Kysela <perex@perex.cz>
dnl Last modification: $Id: alsa.m4,v 1.24 2004/09/15 18:48:07 tiwai Exp $
dnl AM_PATH_ALSA([MINIMUM-VERSION [, ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND]]])
dnl Test for libasound, and define ALSA_CFLAGS and ALSA_LIBS as appropriate.
dnl enables arguments --with-alsa-prefix=
dnl --with-alsa-enc-prefix=
dnl --disable-alsatest
dnl
dnl For backwards compatibility, if ACTION_IF_NOT_FOUND is not specified,
dnl and the alsa libraries are not found, a fatal AC_MSG_ERROR() will result.
dnl
AC_DEFUN([AM_PATH_ALSA],
[dnl Save the original CFLAGS, LDFLAGS, and LIBS
alsa_save_CFLAGS="$CFLAGS"
alsa_save_LDFLAGS="$LDFLAGS"
alsa_save_LIBS="$LIBS"
alsa_found=yes
dnl
dnl Get the cflags and libraries for alsa
dnl
AC_ARG_WITH(alsa-prefix,
[ --with-alsa-prefix=PFX Prefix where Alsa library is installed(optional)],
[alsa_prefix="$withval"], [alsa_prefix=""])
AC_ARG_WITH(alsa-inc-prefix,
[ --with-alsa-inc-prefix=PFX Prefix where include libraries are (optional)],
[alsa_inc_prefix="$withval"], [alsa_inc_prefix=""])
dnl FIXME: this is not yet implemented
AC_ARG_ENABLE(alsatest,
[ --disable-alsatest Do not try to compile and run a test Alsa program],
[enable_alsatest="$enableval"],
[enable_alsatest=yes])
dnl Add any special include directories
AC_MSG_CHECKING(for ALSA CFLAGS)
if test "$alsa_inc_prefix" != "" ; then
ALSA_CFLAGS="$ALSA_CFLAGS -I$alsa_inc_prefix"
CFLAGS="$CFLAGS -I$alsa_inc_prefix"
fi
AC_MSG_RESULT($ALSA_CFLAGS)
dnl add any special lib dirs
AC_MSG_CHECKING(for ALSA LDFLAGS)
if test "$alsa_prefix" != "" ; then
ALSA_LIBS="$ALSA_LIBS -L$alsa_prefix"
LDFLAGS="$LDFLAGS $ALSA_LIBS"
fi
dnl add the alsa library
ALSA_LIBS="$ALSA_LIBS -lasound -lm -ldl -lpthread"
LIBS="$ALSA_LIBS $LIBS"
AC_MSG_RESULT($ALSA_LIBS)
dnl Check for a working version of libasound that is of the right version.
if test "x$enable_alsatest" = "xyes"; then
min_alsa_version=ifelse([$1], ,0.1.1,$1)
AC_MSG_CHECKING(for libasound headers version >= $min_alsa_version)
no_alsa=""
alsa_min_major_version=`echo $min_alsa_version | \
sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\1/'`
alsa_min_minor_version=`echo $min_alsa_version | \
sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\2/'`
alsa_min_micro_version=`echo $min_alsa_version | \
sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\3/'`
AC_LANG_SAVE
AC_LANG_C
AC_TRY_COMPILE([
#include <alsa/asoundlib.h>
], [
/* ensure backward compatibility */
#if !defined(SND_LIB_MAJOR) && defined(SOUNDLIB_VERSION_MAJOR)
#define SND_LIB_MAJOR SOUNDLIB_VERSION_MAJOR
#endif
#if !defined(SND_LIB_MINOR) && defined(SOUNDLIB_VERSION_MINOR)
#define SND_LIB_MINOR SOUNDLIB_VERSION_MINOR
#endif
#if !defined(SND_LIB_SUBMINOR) && defined(SOUNDLIB_VERSION_SUBMINOR)
#define SND_LIB_SUBMINOR SOUNDLIB_VERSION_SUBMINOR
#endif
# if(SND_LIB_MAJOR > $alsa_min_major_version)
exit(0);
# else
# if(SND_LIB_MAJOR < $alsa_min_major_version)
# error not present
# endif
# if(SND_LIB_MINOR > $alsa_min_minor_version)
exit(0);
# else
# if(SND_LIB_MINOR < $alsa_min_minor_version)
# error not present
# endif
# if(SND_LIB_SUBMINOR < $alsa_min_micro_version)
# error not present
# endif
# endif
# endif
exit(0);
],
[AC_MSG_RESULT(found.)],
[AC_MSG_RESULT(not present.)
ifelse([$3], , [AC_MSG_ERROR(Sufficiently new version of libasound not found.)])
alsa_found=no]
)
AC_LANG_RESTORE
fi
dnl Now that we know that we have the right version, let's see if we have the library and not just the headers.
if test "x$enable_alsatest" = "xyes"; then
AC_CHECK_LIB([asound], [snd_ctl_open],,
[ifelse([$3], , [AC_MSG_ERROR(No linkable libasound was found.)])
alsa_found=no]
)
fi
if test "x$alsa_found" = "xyes" ; then
ifelse([$2], , :, [$2])
LIBS=`echo $LIBS | sed 's/-lasound//g'`
LIBS=`echo $LIBS | sed 's/ //'`
LIBS="-lasound $LIBS"
fi
if test "x$alsa_found" = "xno" ; then
ifelse([$3], , :, [$3])
CFLAGS="$alsa_save_CFLAGS"
LDFLAGS="$alsa_save_LDFLAGS"
LIBS="$alsa_save_LIBS"
ALSA_CFLAGS=""
ALSA_LIBS=""
fi
dnl That should be it. Now just export out symbols:
AC_SUBST(ALSA_CFLAGS)
AC_SUBST(ALSA_LIBS)
])
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