acinclude/alsa.m4
author Cameron Cawley <ccawley2011@gmail.com>
Wed, 24 Apr 2019 20:28:21 +0100
branchSDL-1.2
changeset 12722 33940ce0a0ba
parent 4275 b73b5af69f48
permissions -rw-r--r--
Remove duplicate case value
     1 ##############################################################################
     2 dnl Configure Paths for Alsa
     3 dnl Some modifications by Richard Boulton <richard-alsa@tartarus.org>
     4 dnl Christopher Lansdown <lansdoct@cs.alfred.edu>
     5 dnl Jaroslav Kysela <perex@suse.cz>
     6 dnl Last modification: alsa.m4,v 1.23 2004/01/16 18:14:22 tiwai Exp
     7 dnl AM_PATH_ALSA([MINIMUM-VERSION [, ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND]]])
     8 dnl Test for libasound, and define ALSA_CFLAGS and ALSA_LIBS as appropriate.
     9 dnl enables arguments --with-alsa-prefix=
    10 dnl                   --with-alsa-enc-prefix=
    11 dnl                   --disable-alsatest
    12 dnl
    13 dnl For backwards compatibility, if ACTION_IF_NOT_FOUND is not specified,
    14 dnl and the alsa libraries are not found, a fatal AC_MSG_ERROR() will result.
    15 dnl
    16 AC_DEFUN([AM_PATH_ALSA],
    17 [dnl Save the original CFLAGS, LDFLAGS, and LIBS
    18 alsa_save_CFLAGS="$CFLAGS"
    19 alsa_save_LDFLAGS="$LDFLAGS"
    20 alsa_save_LIBS="$LIBS"
    21 alsa_found=yes
    22 
    23 dnl
    24 dnl Get the cflags and libraries for alsa
    25 dnl
    26 AC_ARG_WITH(alsa-prefix,
    27 [  --with-alsa-prefix=PFX  Prefix where Alsa library is installed(optional)],
    28 [alsa_prefix="$withval"], [alsa_prefix=""])
    29 
    30 AC_ARG_WITH(alsa-inc-prefix,
    31 [  --with-alsa-inc-prefix=PFX  Prefix where include libraries are (optional)],
    32 [alsa_inc_prefix="$withval"], [alsa_inc_prefix=""])
    33 
    34 dnl FIXME: this is not yet implemented
    35 AC_ARG_ENABLE(alsatest,
    36 [  --disable-alsatest      Do not try to compile and run a test Alsa program],
    37 [enable_alsatest="$enableval"],
    38 [enable_alsatest=yes])
    39 
    40 dnl Add any special include directories
    41 AC_MSG_CHECKING(for ALSA CFLAGS)
    42 if test "$alsa_inc_prefix" != "" ; then
    43 	ALSA_CFLAGS="$ALSA_CFLAGS -I$alsa_inc_prefix"
    44 	CFLAGS="$CFLAGS -I$alsa_inc_prefix"
    45 fi
    46 AC_MSG_RESULT($ALSA_CFLAGS)
    47 
    48 dnl add any special lib dirs
    49 AC_MSG_CHECKING(for ALSA LDFLAGS)
    50 if test "$alsa_prefix" != "" ; then
    51 	ALSA_LIBS="$ALSA_LIBS -L$alsa_prefix"
    52 	LDFLAGS="$LDFLAGS $ALSA_LIBS"
    53 fi
    54 
    55 dnl add the alsa library
    56 ALSA_LIBS="$ALSA_LIBS -lasound -lm -ldl -lpthread"
    57 LIBS=`echo $LIBS | sed 's/-lm//'`
    58 LIBS=`echo $LIBS | sed 's/-ldl//'`
    59 LIBS=`echo $LIBS | sed 's/-lpthread//'`
    60 LIBS=`echo $LIBS | sed 's/  //'`
    61 LIBS="$ALSA_LIBS $LIBS"
    62 AC_MSG_RESULT($ALSA_LIBS)
    63 
    64 dnl Check for a working version of libasound that is of the right version.
    65 min_alsa_version=ifelse([$1], ,0.1.1,$1)
    66 AC_MSG_CHECKING(for libasound headers version >= $min_alsa_version)
    67 no_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 
    75 AC_LANG_SAVE
    76 AC_LANG_C
    77 AC_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
   110 exit(0);
   111 ],
   112   [AC_MSG_RESULT(found.)],
   113   [AC_MSG_RESULT(not present.)
   114    ifelse([$3], , [AC_MSG_ERROR(Sufficiently new version of libasound not found.)])
   115    alsa_found=no]
   116 )
   117 AC_LANG_RESTORE
   118 
   119 dnl Now that we know that we have the right version, let's see if we have the library and not just the headers.
   120 if test "x$enable_alsatest" = "xyes"; then
   121 AC_CHECK_LIB([asound], [snd_ctl_open],,
   122 	[ifelse([$3], , [AC_MSG_ERROR(No linkable libasound was found.)])
   123 	 alsa_found=no]
   124 )
   125 fi
   126 
   127 if test "x$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 $LIBS"
   132 fi
   133 if test "x$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=""
   140 fi
   141 
   142 dnl That should be it.  Now just export out symbols:
   143 AC_SUBST(ALSA_CFLAGS)
   144 AC_SUBST(ALSA_LIBS)
   145 ])