1##############################################################################
2dnl Configure Paths for Alsa
3dnl Some modifications by Richard Boulton <richard-alsa@tartarus.org>
4dnl Christopher Lansdown <lansdoct@cs.alfred.edu>
5dnl Jaroslav Kysela <perex@suse.cz>
6dnl Last modification: alsa.m4,v 1.23 2004/01/16 18:14:22 tiwai Exp
7dnl AM_PATH_ALSA([MINIMUM-VERSION [, ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND]]])
8dnl Test for libasound, and define ALSA_CFLAGS and ALSA_LIBS as appropriate.
9dnl enables arguments --with-alsa-prefix=
10dnl                   --with-alsa-enc-prefix=
11dnl                   --disable-alsatest
12dnl
13dnl For backwards compatibility, if ACTION_IF_NOT_FOUND is not specified,
14dnl and the alsa libraries are not found, a fatal AC_MSG_ERROR() will result.
15dnl
16AC_DEFUN([AM_PATH_ALSA],
17[dnl Save the original CFLAGS, LDFLAGS, and LIBS
18alsa_save_CFLAGS="$CFLAGS"
19alsa_save_LDFLAGS="$LDFLAGS"
20alsa_save_LIBS="$LIBS"
21alsa_found=yes
22
23dnl
24dnl Get the cflags and libraries for alsa
25dnl
26AC_ARG_WITH(alsa-prefix,
27[  --with-alsa-prefix=PFX  Prefix where Alsa library is installed(optional)],
28[alsa_prefix="$withval"], [alsa_prefix=""])
29
30AC_ARG_WITH(alsa-inc-prefix,
31[  --with-alsa-inc-prefix=PFX  Prefix where include libraries are (optional)],
32[alsa_inc_prefix="$withval"], [alsa_inc_prefix=""])
33
34dnl FIXME: this is not yet implemented
35AC_ARG_ENABLE(alsatest,
36[  --disable-alsatest      Do not try to compile and run a test Alsa program],
37[enable_alsatest="$enableval"],
38[enable_alsatest=yes])
39
40dnl Add any special include directories
41AC_MSG_CHECKING(for ALSA CFLAGS)
42if test "$alsa_inc_prefix" != "" ; then
43	ALSA_CFLAGS="$ALSA_CFLAGS -I$alsa_inc_prefix"
44	CFLAGS="$CFLAGS -I$alsa_inc_prefix"
45fi
46AC_MSG_RESULT($ALSA_CFLAGS)
47
48dnl add any special lib dirs
49AC_MSG_CHECKING(for ALSA LDFLAGS)
50if test "$alsa_prefix" != "" ; then
51	ALSA_LIBS="$ALSA_LIBS -L$alsa_prefix"
52	LDFLAGS="$LDFLAGS $ALSA_LIBS"
53fi
54
55dnl add the alsa library
56ALSA_LIBS="$ALSA_LIBS -lasound -lm -ldl -lpthread"
57LIBS=`echo $LIBS | sed 's/-lm//'`
58LIBS=`echo $LIBS | sed 's/-ldl//'`
59LIBS=`echo $LIBS | sed 's/-lpthread//'`
60LIBS=`echo $LIBS | sed 's/  //'`
61LIBS="$ALSA_LIBS $LIBS"
62AC_MSG_RESULT($ALSA_LIBS)
63
64dnl Check for a working version of libasound that is of the right version.
65min_alsa_version=ifelse([$1], ,0.1.1,$1)
66AC_MSG_CHECKING(for libasound headers version >= $min_alsa_version)
67no_alsa=""
68    alsa_min_major_version=`echo $min_alsa_version | \
69           sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\1/'`
70    alsa_min_minor_version=`echo $min_alsa_version | \
71           sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\2/'`
72    alsa_min_micro_version=`echo $min_alsa_version | \
73           sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\3/'`
74
75AC_LANG_SAVE
76AC_LANG_C
77AC_TRY_COMPILE([
78#include <alsa/asoundlib.h>
79], [
80/* ensure backward compatibility */
81#if !defined(SND_LIB_MAJOR) && defined(SOUNDLIB_VERSION_MAJOR)
82#define SND_LIB_MAJOR SOUNDLIB_VERSION_MAJOR
83#endif
84#if !defined(SND_LIB_MINOR) && defined(SOUNDLIB_VERSION_MINOR)
85#define SND_LIB_MINOR SOUNDLIB_VERSION_MINOR
86#endif
87#if !defined(SND_LIB_SUBMINOR) && defined(SOUNDLIB_VERSION_SUBMINOR)
88#define SND_LIB_SUBMINOR SOUNDLIB_VERSION_SUBMINOR
89#endif
90
91#  if(SND_LIB_MAJOR > $alsa_min_major_version)
92  exit(0);
93#  else
94#    if(SND_LIB_MAJOR < $alsa_min_major_version)
95#       error not present
96#    endif
97
98#   if(SND_LIB_MINOR > $alsa_min_minor_version)
99  exit(0);
100#   else
101#     if(SND_LIB_MINOR < $alsa_min_minor_version)
102#          error not present
103#      endif
104
105#      if(SND_LIB_SUBMINOR < $alsa_min_micro_version)
106#        error not present
107#      endif
108#    endif
109#  endif
110exit(0);
111],
112  [AC_MSG_RESULT(found.)],
113  [AC_MSG_RESULT(not present.)
114   ifelse([$3], , [AC_MSG_ERROR(Sufficiently new version of libasound not found.)])
115   alsa_found=no]
116)
117AC_LANG_RESTORE
118
119dnl Now that we know that we have the right version, let's see if we have the library and not just the headers.
120if test "x$enable_alsatest" = "xyes"; then
121AC_CHECK_LIB([asound], [snd_ctl_open],,
122	[ifelse([$3], , [AC_MSG_ERROR(No linkable libasound was found.)])
123	 alsa_found=no]
124)
125fi
126
127if test "x$alsa_found" = "xyes" ; then
128   ifelse([$2], , :, [$2])
129   LIBS=`echo $LIBS | sed 's/-lasound//g'`
130   LIBS=`echo $LIBS | sed 's/  //'`
131   LIBS="-lasound $LIBS"
132fi
133if test "x$alsa_found" = "xno" ; then
134   ifelse([$3], , :, [$3])
135   CFLAGS="$alsa_save_CFLAGS"
136   LDFLAGS="$alsa_save_LDFLAGS"
137   LIBS="$alsa_save_LIBS"
138   ALSA_CFLAGS=""
139   ALSA_LIBS=""
140fi
141
142dnl That should be it.  Now just export out symbols:
143AC_SUBST(ALSA_CFLAGS)
144AC_SUBST(ALSA_LIBS)
145])
146