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annotate acinclude/alsa.m4 @ 4495:dbbfdb9ea716

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Simplified clipboard API for sanity's sake. A complete clipboard implementation would support multiple formats that could be queried at runtime, events for when the clipboard contents changed, support for HTML, images, etc. We're not going that crazy, at least for now. :)
author Sam Lantinga <slouken@libsdl.org>
date Wed, 07 Jul 2010 23:54:03 -0700
parents 3da232c5980a
children
rev   line source
3342
3da232c5980a Split acinclude.m4 into its constituent parts for easy upgrading
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1 ##############################################################################
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2 dnl Configure Paths for Alsa
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3 dnl Some modifications by Richard Boulton <richard-alsa@tartarus.org>
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4 dnl Christopher Lansdown <lansdoct@cs.alfred.edu>
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5 dnl Jaroslav Kysela <perex@suse.cz>
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6 dnl Last modification: alsa.m4,v 1.23 2004/01/16 18:14:22 tiwai Exp
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7 dnl AM_PATH_ALSA([MINIMUM-VERSION [, ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND]]])
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8 dnl Test for libasound, and define ALSA_CFLAGS and ALSA_LIBS as appropriate.
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9 dnl enables arguments --with-alsa-prefix=
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10 dnl --with-alsa-enc-prefix=
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11 dnl --disable-alsatest
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12 dnl
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13 dnl For backwards compatibility, if ACTION_IF_NOT_FOUND is not specified,
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14 dnl and the alsa libraries are not found, a fatal AC_MSG_ERROR() will result.
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15 dnl
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16 AC_DEFUN([AM_PATH_ALSA],
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17 [dnl Save the original CFLAGS, LDFLAGS, and LIBS
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18 alsa_save_CFLAGS="$CFLAGS"
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19 alsa_save_LDFLAGS="$LDFLAGS"
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20 alsa_save_LIBS="$LIBS"
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21 alsa_found=yes
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22
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23 dnl
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24 dnl Get the cflags and libraries for alsa
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25 dnl
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26 AC_ARG_WITH(alsa-prefix,
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27 [ --with-alsa-prefix=PFX Prefix where Alsa library is installed(optional)],
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28 [alsa_prefix="$withval"], [alsa_prefix=""])
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29
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30 AC_ARG_WITH(alsa-inc-prefix,
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31 [ --with-alsa-inc-prefix=PFX Prefix where include libraries are (optional)],
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32 [alsa_inc_prefix="$withval"], [alsa_inc_prefix=""])
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33
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34 dnl FIXME: this is not yet implemented
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35 AC_ARG_ENABLE(alsatest,
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36 [ --disable-alsatest Do not try to compile and run a test Alsa program],
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37 [enable_alsatest="$enableval"],
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38 [enable_alsatest=yes])
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39
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40 dnl Add any special include directories
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41 AC_MSG_CHECKING(for ALSA CFLAGS)
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42 if test "$alsa_inc_prefix" != "" ; then
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43 ALSA_CFLAGS="$ALSA_CFLAGS -I$alsa_inc_prefix"
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44 CFLAGS="$CFLAGS -I$alsa_inc_prefix"
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45 fi
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46 AC_MSG_RESULT($ALSA_CFLAGS)
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47
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48 dnl add any special lib dirs
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49 AC_MSG_CHECKING(for ALSA LDFLAGS)
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50 if test "$alsa_prefix" != "" ; then
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51 ALSA_LIBS="$ALSA_LIBS -L$alsa_prefix"
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52 LDFLAGS="$LDFLAGS $ALSA_LIBS"
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53 fi
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54
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55 dnl add the alsa library
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56 ALSA_LIBS="$ALSA_LIBS -lasound -lm -ldl -lpthread"
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57 LIBS=`echo $LIBS | sed 's/-lm//'`
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58 LIBS=`echo $LIBS | sed 's/-ldl//'`
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59 LIBS=`echo $LIBS | sed 's/-lpthread//'`
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60 LIBS=`echo $LIBS | sed 's/ //'`
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61 LIBS="$ALSA_LIBS $LIBS"
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62 AC_MSG_RESULT($ALSA_LIBS)
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63
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64 dnl Check for a working version of libasound that is of the right version.
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65 min_alsa_version=ifelse([$1], ,0.1.1,$1)
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66 AC_MSG_CHECKING(for libasound headers version >= $min_alsa_version)
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67 no_alsa=""
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68 alsa_min_major_version=`echo $min_alsa_version | \
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69 sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\1/'`
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70 alsa_min_minor_version=`echo $min_alsa_version | \
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71 sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\2/'`
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72 alsa_min_micro_version=`echo $min_alsa_version | \
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73 sed 's/\([[0-9]]*\).\([[0-9]]*\).\([[0-9]]*\)/\3/'`
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74
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75 AC_LANG_SAVE
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76 AC_LANG_C
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77 AC_TRY_COMPILE([
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78 #include <alsa/asoundlib.h>
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79 ], [
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80 /* ensure backward compatibility */
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81 #if !defined(SND_LIB_MAJOR) && defined(SOUNDLIB_VERSION_MAJOR)
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82 #define SND_LIB_MAJOR SOUNDLIB_VERSION_MAJOR
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83 #endif
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84 #if !defined(SND_LIB_MINOR) && defined(SOUNDLIB_VERSION_MINOR)
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85 #define SND_LIB_MINOR SOUNDLIB_VERSION_MINOR
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86 #endif
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87 #if !defined(SND_LIB_SUBMINOR) && defined(SOUNDLIB_VERSION_SUBMINOR)
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88 #define SND_LIB_SUBMINOR SOUNDLIB_VERSION_SUBMINOR
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89 #endif
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90
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91 # if(SND_LIB_MAJOR > $alsa_min_major_version)
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92 exit(0);
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93 # else
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94 # if(SND_LIB_MAJOR < $alsa_min_major_version)
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95 # error not present
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96 # endif
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97
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98 # if(SND_LIB_MINOR > $alsa_min_minor_version)
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99 exit(0);
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100 # else
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101 # if(SND_LIB_MINOR < $alsa_min_minor_version)
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102 # error not present
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103 # endif
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104
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105 # if(SND_LIB_SUBMINOR < $alsa_min_micro_version)
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106 # error not present
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107 # endif
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108 # endif
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109 # endif
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110 exit(0);
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111 ],
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112 [AC_MSG_RESULT(found.)],
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113 [AC_MSG_RESULT(not present.)
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114 ifelse([$3], , [AC_MSG_ERROR(Sufficiently new version of libasound not found.)])
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115 alsa_found=no]
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116 )
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117 AC_LANG_RESTORE
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118
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119 dnl Now that we know that we have the right version, let's see if we have the library and not just the headers.
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120 if test "x$enable_alsatest" = "xyes"; then
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121 AC_CHECK_LIB([asound], [snd_ctl_open],,
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122 [ifelse([$3], , [AC_MSG_ERROR(No linkable libasound was found.)])
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123 alsa_found=no]
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124 )
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125 fi
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126
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127 if test "x$alsa_found" = "xyes" ; then
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128 ifelse([$2], , :, [$2])
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129 LIBS=`echo $LIBS | sed 's/-lasound//g'`
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130 LIBS=`echo $LIBS | sed 's/ //'`
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131 LIBS="-lasound $LIBS"
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132 fi
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133 if test "x$alsa_found" = "xno" ; then
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134 ifelse([$3], , :, [$3])
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135 CFLAGS="$alsa_save_CFLAGS"
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136 LDFLAGS="$alsa_save_LDFLAGS"
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137 LIBS="$alsa_save_LIBS"
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138 ALSA_CFLAGS=""
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139 ALSA_LIBS=""
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140 fi
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141
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142 dnl That should be it. Now just export out symbols:
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143 AC_SUBST(ALSA_CFLAGS)
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144 AC_SUBST(ALSA_LIBS)
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145 ])