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annotate acinclude/ltsugar.m4 @ 4334:afadcd7d2319 SDL-1.2

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Use the plug: ALSA devices for surround sound formats, which have automatic sample format/rate conversion. Based on feedback from the ALSA development mailing list: http://mailman.alsa-project.org/pipermail/alsa-devel/2009-October/022267.html
author Sam Lantinga <slouken@libsdl.org>
date Tue, 13 Oct 2009 09:59:20 +0000
parents 803eeeeaa8a0
children
rev   line source
4277
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1 ##############################################################################
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2 # ltsugar.m4 -- libtool m4 base layer. -*-Autoconf-*-
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3 #
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4 # Copyright (C) 2004, 2005, 2007, 2008 Free Software Foundation, Inc.
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5 # Written by Gary V. Vaughan, 2004
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6 #
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7 # This file is free software; the Free Software Foundation gives
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8 # unlimited permission to copy and/or distribute it, with or without
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9 # modifications, as long as this notice is preserved.
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10
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11 # serial 6 ltsugar.m4
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12
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13 # This is to help aclocal find these macros, as it can't see m4_define.
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14 AC_DEFUN([LTSUGAR_VERSION], [m4_if([0.1])])
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15
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16
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17 # lt_join(SEP, ARG1, [ARG2...])
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18 # -----------------------------
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19 # Produce ARG1SEPARG2...SEPARGn, omitting [] arguments and their
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20 # associated separator.
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21 # Needed until we can rely on m4_join from Autoconf 2.62, since all earlier
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22 # versions in m4sugar had bugs.
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23 m4_define([lt_join],
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24 [m4_if([$#], [1], [],
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25 [$#], [2], [[$2]],
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26 [m4_if([$2], [], [], [[$2]_])$0([$1], m4_shift(m4_shift($@)))])])
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27 m4_define([_lt_join],
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28 [m4_if([$#$2], [2], [],
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29 [m4_if([$2], [], [], [[$1$2]])$0([$1], m4_shift(m4_shift($@)))])])
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30
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31
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32 # lt_car(LIST)
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33 # lt_cdr(LIST)
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34 # ------------
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35 # Manipulate m4 lists.
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36 # These macros are necessary as long as will still need to support
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37 # Autoconf-2.59 which quotes differently.
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38 m4_define([lt_car], [[$1]])
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39 m4_define([lt_cdr],
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40 [m4_if([$#], 0, [m4_fatal([$0: cannot be called without arguments])],
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41 [$#], 1, [],
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42 [m4_dquote(m4_shift($@))])])
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43 m4_define([lt_unquote], $1)
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44
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45
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46 # lt_append(MACRO-NAME, STRING, [SEPARATOR])
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47 # ------------------------------------------
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48 # Redefine MACRO-NAME to hold its former content plus `SEPARATOR'`STRING'.
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49 # Note that neither SEPARATOR nor STRING are expanded; they are appended
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50 # to MACRO-NAME as is (leaving the expansion for when MACRO-NAME is invoked).
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51 # No SEPARATOR is output if MACRO-NAME was previously undefined (different
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52 # than defined and empty).
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53 #
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54 # This macro is needed until we can rely on Autoconf 2.62, since earlier
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55 # versions of m4sugar mistakenly expanded SEPARATOR but not STRING.
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56 m4_define([lt_append],
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57 [m4_define([$1],
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58 m4_ifdef([$1], [m4_defn([$1])[$3]])[$2])])
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59
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60
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61
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62 # lt_combine(SEP, PREFIX-LIST, INFIX, SUFFIX1, [SUFFIX2...])
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63 # ----------------------------------------------------------
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64 # Produce a SEP delimited list of all paired combinations of elements of
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65 # PREFIX-LIST with SUFFIX1 through SUFFIXn. Each element of the list
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66 # has the form PREFIXmINFIXSUFFIXn.
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67 # Needed until we can rely on m4_combine added in Autoconf 2.62.
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68 m4_define([lt_combine],
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69 [m4_if(m4_eval([$# > 3]), [1],
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70 [m4_pushdef([_Lt_sep], [m4_define([_Lt_sep], m4_defn([lt_car]))])]]dnl
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71 [[m4_foreach([_Lt_prefix], [$2],
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72 [m4_foreach([_Lt_suffix],
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73 ]m4_dquote(m4_dquote(m4_shift(m4_shift(m4_shift($@)))))[,
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74 [_Lt_sep([$1])[]m4_defn([_Lt_prefix])[$3]m4_defn([_Lt_suffix])])])])])
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75
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76
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77 # lt_if_append_uniq(MACRO-NAME, VARNAME, [SEPARATOR], [UNIQ], [NOT-UNIQ])
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78 # -----------------------------------------------------------------------
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79 # Iff MACRO-NAME does not yet contain VARNAME, then append it (delimited
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80 # by SEPARATOR if supplied) and expand UNIQ, else NOT-UNIQ.
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81 m4_define([lt_if_append_uniq],
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82 [m4_ifdef([$1],
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83 [m4_if(m4_index([$3]m4_defn([$1])[$3], [$3$2$3]), [-1],
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84 [lt_append([$1], [$2], [$3])$4],
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85 [$5])],
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86 [lt_append([$1], [$2], [$3])$4])])
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87
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88
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89 # lt_dict_add(DICT, KEY, VALUE)
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90 # -----------------------------
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91 m4_define([lt_dict_add],
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92 [m4_define([$1($2)], [$3])])
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93
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94
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95 # lt_dict_add_subkey(DICT, KEY, SUBKEY, VALUE)
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96 # --------------------------------------------
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97 m4_define([lt_dict_add_subkey],
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98 [m4_define([$1($2:$3)], [$4])])
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99
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100
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101 # lt_dict_fetch(DICT, KEY, [SUBKEY])
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102 # ----------------------------------
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103 m4_define([lt_dict_fetch],
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104 [m4_ifval([$3],
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105 m4_ifdef([$1($2:$3)], [m4_defn([$1($2:$3)])]),
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106 m4_ifdef([$1($2)], [m4_defn([$1($2)])]))])
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107
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108
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109 # lt_if_dict_fetch(DICT, KEY, [SUBKEY], VALUE, IF-TRUE, [IF-FALSE])
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110 # -----------------------------------------------------------------
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111 m4_define([lt_if_dict_fetch],
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112 [m4_if(lt_dict_fetch([$1], [$2], [$3]), [$4],
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113 [$5],
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114 [$6])])
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115
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116
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117 # lt_dict_filter(DICT, [SUBKEY], VALUE, [SEPARATOR], KEY, [...])
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118 # --------------------------------------------------------------
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119 m4_define([lt_dict_filter],
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120 [m4_if([$5], [], [],
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121 [lt_join(m4_quote(m4_default([$4], [[, ]])),
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122 lt_unquote(m4_split(m4_normalize(m4_foreach(_Lt_key, lt_car([m4_shiftn(4, $@)]),
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123 [lt_if_dict_fetch([$1], _Lt_key, [$2], [$3], [_Lt_key ])])))))])[]dnl
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124 ])
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125