1dnl Configure Paths for Alsa
2dnl Some modifications by Richard Boulton <richard-alsa@tartarus.org>
3dnl Christopher Lansdown <lansdoct@cs.alfred.edu>
4dnl Jaroslav Kysela <perex@suse.cz>
5dnl Last modification: alsa.m4,v 1.23 2004/01/16 18:14:22 tiwai Exp
6dnl AM_PATH_ALSA([MINIMUM-VERSION [, ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND]]])
7dnl Test for libasound, and define ALSA_CFLAGS and ALSA_LIBS as appropriate.
8dnl enables arguments --with-alsa-prefix=
9dnl                   --with-alsa-enc-prefix=
10dnl                   --disable-alsatest
11dnl
12dnl For backwards compatibility, if ACTION_IF_NOT_FOUND is not specified,
13dnl and the alsa libraries are not found, a fatal AC_MSG_ERROR() will result.
14dnl
15AC_DEFUN([AM_PATH_ALSA],
16[dnl Save the original CFLAGS, LDFLAGS, and LIBS
17alsa_save_CFLAGS="$CFLAGS"
18alsa_save_LDFLAGS="$LDFLAGS"
19alsa_save_LIBS="$LIBS"
20alsa_found=yes
21
22dnl
23dnl Get the cflags and libraries for alsa
24dnl
25AC_ARG_WITH(alsa-prefix,
26  AC_HELP_STRING([--with-alsa-prefix=PFX],
27                 [prefix where Alsa library is installed(optional)]),
28  [alsa_prefix="$withval"], [alsa_prefix=""])
29
30AC_ARG_WITH(alsa-inc-prefix,
31  AC_HELP_STRING([--with-alsa-inc-prefix=PFX],
32                 [prefix where include libraries are (optional)]),
33  [alsa_inc_prefix="$withval"], [alsa_inc_prefix=""])
34
35dnl FIXME: this is not yet implemented
36dnl AC_ARG_ENABLE(alsatest,
37dnl  AC_HELP_STRING([--disable-alsatest],
38dnl                 [do not try to compile and run a test Alsa program],
39dnl                 [enable_alsatest=no], [enable_alsatest=yes])
40
41dnl Add any special include directories
42AC_MSG_CHECKING(for ALSA CFLAGS)
43if test "$alsa_inc_prefix" != "" ; then
44	ALSA_CFLAGS="$ALSA_CFLAGS -I$alsa_inc_prefix"
45	CFLAGS="$CFLAGS -I$alsa_inc_prefix"
46fi
47AC_MSG_RESULT($ALSA_CFLAGS)
48
49dnl add any special lib dirs
50AC_MSG_CHECKING(for ALSA LDFLAGS)
51if test "$alsa_prefix" != "" ; then
52	ALSA_LIBS="$ALSA_LIBS -L$alsa_prefix"
53	LDFLAGS="$LDFLAGS $ALSA_LIBS"
54fi
55
56dnl add the alsa library
57ALSA_LIBS="$ALSA_LIBS -lasound -lm -ldl -lpthread"
58LIBS=`echo $LIBS | sed 's/-lm//'`
59LIBS=`echo $LIBS | sed 's/-ldl//'`
60LIBS=`echo $LIBS | sed 's/-lpthread//'`
61LIBS=`echo $LIBS | sed 's/  //'`
62LIBS="$ALSA_LIBS $LIBS"
63AC_MSG_RESULT($ALSA_LIBS)
64
65dnl Check for a working version of libasound that is of the right version.
66min_alsa_version=ifelse([$1], ,0.1.1,$1)
67AC_MSG_CHECKING(for libasound headers version >= $min_alsa_version)
68no_alsa=""
69    alsa_min_major_version=`echo $min_alsa_version | \
70           sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\1/'`
71    alsa_min_minor_version=`echo $min_alsa_version | \
72           sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\2/'`
73    alsa_min_micro_version=`echo $min_alsa_version | \
74           sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\3/'`
75
76AC_LANG_SAVE
77AC_LANG_C
78AC_TRY_COMPILE([
79#include <alsa/asoundlib.h>
80], [
81void main(void)
82{
83/* ensure backward compatibility */
84#if !defined(SND_LIB_MAJOR) && defined(SOUNDLIB_VERSION_MAJOR)
85#define SND_LIB_MAJOR SOUNDLIB_VERSION_MAJOR
86#endif
87#if !defined(SND_LIB_MINOR) && defined(SOUNDLIB_VERSION_MINOR)
88#define SND_LIB_MINOR SOUNDLIB_VERSION_MINOR
89#endif
90#if !defined(SND_LIB_SUBMINOR) && defined(SOUNDLIB_VERSION_SUBMINOR)
91#define SND_LIB_SUBMINOR SOUNDLIB_VERSION_SUBMINOR
92#endif
93
94#  if(SND_LIB_MAJOR > $alsa_min_major_version)
95  exit(0);
96#  else
97#    if(SND_LIB_MAJOR < $alsa_min_major_version)
98#       error not present
99#    endif
100
101#   if(SND_LIB_MINOR > $alsa_min_minor_version)
102  exit(0);
103#   else
104#     if(SND_LIB_MINOR < $alsa_min_minor_version)
105#          error not present
106#      endif
107
108#      if(SND_LIB_SUBMINOR < $alsa_min_micro_version)
109#        error not present
110#      endif
111#    endif
112#  endif
113exit(0);
114}
115],
116  [AC_MSG_RESULT(found.)],
117  [AC_MSG_RESULT(not present.)
118   ifelse([$3], , [AC_MSG_ERROR(Sufficiently new version of libasound not found.)])
119   alsa_found=no]
120)
121AC_LANG_RESTORE
122
123dnl Now that we know that we have the right version, let's see if we have the library and not just the headers.
124if test "x$enable_alsatest" = "xyes"; then
125AC_CHECK_LIB([asound], [snd_ctl_open],,
126	[ifelse([$3], , [AC_MSG_ERROR(No linkable libasound was found.)])
127	 alsa_found=no]
128)
129fi
130
131if test "x$alsa_found" = "xyes" ; then
132   ifelse([$2], , :, [$2])
133   LIBS=`echo $LIBS | sed 's/-lasound//g'`
134   LIBS=`echo $LIBS | sed 's/  //'`
135   LIBS="-lasound $LIBS"
136fi
137if test "x$alsa_found" = "xno" ; then
138   ifelse([$3], , :, [$3])
139   CFLAGS="$alsa_save_CFLAGS"
140   LDFLAGS="$alsa_save_LDFLAGS"
141   LIBS="$alsa_save_LIBS"
142   ALSA_CFLAGS=""
143   ALSA_LIBS=""
144fi
145
146dnl That should be it.  Now just export out symbols:
147AC_SUBST(ALSA_CFLAGS)
148AC_SUBST(ALSA_LIBS)
149])
150
151