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@perex.cz>
5dnl Last modification: $Id: alsa.m4,v 1.24 2004/09/15 18:48:07 tiwai Exp $
6dnl
7dnl AM_PATH_ALSA([MINIMUM-VERSION [, ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND]]])
8dnl Test for libasound, and define ALSA_CFLAGS, ALSA_LIBS and
9dnl ALSA_TOPOLOGY_LIBS as appropriate.
10dnl
11dnl enables arguments --with-alsa-prefix=
12dnl                   --with-alsa-inc-prefix=
13dnl                   --disable-alsatest
14dnl
15dnl For backwards compatibility, if ACTION_IF_NOT_FOUND is not specified,
16dnl and the alsa libraries are not found, a fatal AC_MSG_ERROR() will result.
17dnl
18
19AC_DEFUN([AM_PATH_ALSA],
20[dnl Save the original CFLAGS, LDFLAGS, and LIBS
21alsa_save_CFLAGS="$CFLAGS"
22alsa_save_LDFLAGS="$LDFLAGS"
23alsa_save_LIBS="$LIBS"
24alsa_found=yes
25alsa_topology_found=no
26
27dnl
28dnl Get the cflags and libraries for alsa
29dnl
30AC_ARG_WITH(alsa-prefix,
31  AS_HELP_STRING([--with-alsa-prefix=PFX], [Prefix where Alsa library is installed(optional)]),
32  [alsa_prefix="$withval"], [alsa_prefix=""])
33
34AC_ARG_WITH(alsa-inc-prefix,
35  AS_HELP_STRING([--with-alsa-inc-prefix=PFX], [Prefix where include libraries are (optional)]),
36  [alsa_inc_prefix="$withval"], [alsa_inc_prefix=""])
37
38AC_ARG_ENABLE(alsa-topology,
39  AS_HELP_STRING([--enable-alsatopology], [Force to use the Alsa topology library]),
40  [enable_atopology="$enableval"],
41  [enable_atopology=no])
42
43AC_ARG_ENABLE(alsatest,
44  AS_HELP_STRING([--disable-alsatest], [Do not try to compile and run a test Alsa program]),
45  [enable_alsatest="$enableval"],
46  [enable_alsatest=yes])
47
48dnl Add any special include directories
49AC_MSG_CHECKING(for ALSA CFLAGS)
50if test "$alsa_inc_prefix" != "" ; then
51	ALSA_CFLAGS="$ALSA_CFLAGS -I$alsa_inc_prefix"
52	CFLAGS="$CFLAGS -I$alsa_inc_prefix"
53fi
54AC_MSG_RESULT($ALSA_CFLAGS)
55
56AC_CHECK_LIB(c, dlopen, LIBDL="", [AC_CHECK_LIB(dl, dlopen, LIBDL="-ldl")])
57
58dnl add any special lib dirs
59AC_MSG_CHECKING(for ALSA LDFLAGS)
60if test "$alsa_prefix" != "" ; then
61	ALSA_LIBS="$ALSA_LIBS -L$alsa_prefix"
62	LDFLAGS="$LDFLAGS $ALSA_LIBS"
63fi
64
65dnl add the alsa library
66ALSA_LIBS="$ALSA_LIBS -lasound -lm $LIBDL -lpthread"
67LIBS="$ALSA_LIBS $LIBS"
68AC_MSG_RESULT($ALSA_LIBS)
69
70dnl Check for a working version of libasound that is of the right version.
71if test "x$enable_alsatest" = "xyes"; then
72
73AC_MSG_CHECKING([required libasound headers version])
74min_alsa_version=ifelse([$1], , 0.1.1, $1)
75no_alsa=""
76    alsa_min_major_version=`echo $min_alsa_version | \
77           sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\1/'`
78    alsa_min_minor_version=`echo $min_alsa_version | \
79           sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\2/'`
80    alsa_min_micro_version=`echo $min_alsa_version | \
81           sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\3/'`
82AC_MSG_RESULT($alsa_min_major_version.$alsa_min_minor_version.$alsa_min_micro_version)
83
84AC_LANG_PUSH([C])
85AC_MSG_CHECKING([for libasound headers version >= $alsa_min_major_version.$alsa_min_minor_version.$alsa_min_micro_version ($min_alsa_version)])
86AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
87#include <alsa/asoundlib.h>
88#include <stdlib.h>
89]], [[
90/* ensure backward compatibility */
91#if !defined(SND_LIB_MAJOR) && defined(SOUNDLIB_VERSION_MAJOR)
92#define SND_LIB_MAJOR SOUNDLIB_VERSION_MAJOR
93#endif
94#if !defined(SND_LIB_MINOR) && defined(SOUNDLIB_VERSION_MINOR)
95#define SND_LIB_MINOR SOUNDLIB_VERSION_MINOR
96#endif
97#if !defined(SND_LIB_SUBMINOR) && defined(SOUNDLIB_VERSION_SUBMINOR)
98#define SND_LIB_SUBMINOR SOUNDLIB_VERSION_SUBMINOR
99#endif
100
101#  if(SND_LIB_MAJOR > $alsa_min_major_version)
102  exit(0);
103#  else
104#    if(SND_LIB_MAJOR < $alsa_min_major_version)
105#       error not present
106#    endif
107
108#   if(SND_LIB_MINOR > $alsa_min_minor_version)
109  exit(0);
110#   else
111#     if(SND_LIB_MINOR < $alsa_min_minor_version)
112#          error not present
113#      endif
114
115#      if(SND_LIB_SUBMINOR < $alsa_min_micro_version)
116#        error not present
117#      endif
118#    endif
119#  endif
120exit(0);
121]])],
122  [AC_MSG_RESULT(found.)],
123  [AC_MSG_RESULT(not present.)
124   ifelse([$3], , [AC_MSG_ERROR(Sufficiently new version of libasound not found.)])
125   alsa_found=no]
126)
127AC_LANG_POP([C])
128
129AC_LANG_PUSH([C])
130AC_MSG_CHECKING([for libatopology (sound headers version > 1.1.9)])
131AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
132#include <alsa/asoundlib.h>
133#include <alsa/topology.h>
134#include <stdlib.h>
135]], [[
136/* ensure backward compatibility */
137#if !defined(SND_LIB_VERSION)
138#define SND_LIB_VERSION 0
139#endif
140#if SND_LIB_VERSION > 0x00010109
141  exit(0);
142#else
143# error not present
144#endif
145exit(0);
146]])],
147  [AC_MSG_RESULT(yes)
148   enable_atopology="yes"],
149  [AC_MSG_RESULT(no)]
150)
151AC_LANG_POP([C])
152fi
153
154dnl Now that we know that we have the right version, let's see if we have the library and not just the headers.
155if test "x$enable_alsatest" = "xyes"; then
156AC_CHECK_LIB([asound], [snd_ctl_open],,
157	[ifelse([$3], , [AC_MSG_ERROR(No linkable libasound was found.)])
158	 alsa_found=no]
159)
160if test "x$enable_atopology" = "xyes"; then
161alsa_topology_found=yes
162alsa_save_LIBS2="$LIBS"
163AC_CHECK_LIB([atopology], [snd_tplg_new],,
164	[ifelse([$3], , [AC_MSG_ERROR(No linkable libatopology was found.)])
165	 alsa_topology_found=no,
166]
167)
168LIBS="$alsa_save_LIBS2"
169fi
170else
171if test "x$enable_atopology" = "xyes"; then
172  alsa_topology_found=yes
173fi
174fi
175
176if test "x$alsa_found" = "xyes" ; then
177   ifelse([$2], , :, [$2])
178   LIBS=`echo $LIBS | sed 's/-lasound//g'`
179   LIBS=`echo $LIBS | sed 's/  //'`
180   LIBS="-lasound $LIBS"
181fi
182if test "x$alsa_found" = "xno" ; then
183   ifelse([$3], , :, [$3])
184   CFLAGS="$alsa_save_CFLAGS"
185   LDFLAGS="$alsa_save_LDFLAGS"
186   LIBS="$alsa_save_LIBS"
187   ALSA_CFLAGS=""
188   ALSA_LIBS=""
189   ALSA_TOPOLOGY_LIBS=""
190fi
191
192dnl add the alsa topology library; must be at the end
193AC_MSG_CHECKING(for ALSA topology LDFLAGS)
194if test "x$alsa_topology_found" = "xyes"; then
195  ALSA_TOPOLOGY_LIBS="$ALSA_TOPOLOGY_LIBS -latopology"
196fi
197AC_MSG_RESULT($ALSA_TOPOLOGY_LIBS)
198
199dnl That should be it.  Now just export out symbols:
200AC_SUBST(ALSA_CFLAGS)
201AC_SUBST(ALSA_LIBS)
202AC_SUBST(ALSA_TOPOLOGY_LIBS)
203])
204