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author Shinji KONO <kono@ie.u-ryukyu.ac.jp>
date Mon, 25 May 2020 18:13:55 +0900
parents 1830386684a0
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
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1 dnl Fix Autoconf bugs by overriding broken internal Autoconf
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2 dnl macros with backports of fixes from newer releases.
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3 dnl
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4 dnl The override bits of this file should be a no-op for the newest
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5 dnl Autoconf version, which means they can be removed once the complete
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6 dnl tree has moved to a new enough Autoconf version.
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7 dnl
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8 dnl The _GCC_AUTOCONF_VERSION_TEST ensures that exactly the desired
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9 dnl Autoconf version is used. It should be kept for consistency.
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10
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11 dnl Use ifdef/ifelse over m4_ifdef/m4_ifelse to be clean for 2.13.
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12 ifdef([m4_PACKAGE_VERSION], [
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13
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14 dnl Provide m4_copy_force and m4_rename_force for old Autoconf versions.
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15
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16 m4_ifndef([m4_copy_force],
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17 [m4_define([m4_copy_force],
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18 [m4_ifdef([$2], [m4_undefine([$2])])m4_copy($@)])])
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19
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20 m4_ifndef([m4_rename_force],
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21 [m4_define([m4_rename_force],
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22 [m4_ifdef([$2], [m4_undefine([$2])])m4_rename($@)])])
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24 dnl AC_DEFUN a commonly used macro so this file is picked up.
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25 m4_copy([AC_PREREQ], [_AC_PREREQ])
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26 AC_DEFUN([AC_PREREQ], [frob])
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27 m4_copy_force([_AC_PREREQ], [AC_PREREQ])
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28
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29
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30 dnl Ensure exactly this Autoconf version is used
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31 m4_ifndef([_GCC_AUTOCONF_VERSION],
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32 [m4_define([_GCC_AUTOCONF_VERSION], [2.69])])
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33
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34 dnl Test for the exact version when AC_INIT is expanded.
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35 dnl This allows to update the tree in steps (for testing)
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36 dnl by putting
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37 dnl m4_define([_GCC_AUTOCONF_VERSION], [X.Y])
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38 dnl in configure.ac before AC_INIT,
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39 dnl without rewriting this file.
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40 dnl Or for updating the whole tree at once with the definition above.
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41 AC_DEFUN([_GCC_AUTOCONF_VERSION_CHECK],
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42 [m4_if(m4_defn([_GCC_AUTOCONF_VERSION]),
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43 m4_defn([m4_PACKAGE_VERSION]), [],
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44 [m4_fatal([Please use exactly Autoconf ]_GCC_AUTOCONF_VERSION[ instead of ]m4_defn([m4_PACKAGE_VERSION])[.])])
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45 ])
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46 m4_define([AC_INIT], m4_defn([AC_INIT])[
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47 _GCC_AUTOCONF_VERSION_CHECK
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48 ])
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67
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51 dnl Ensure we do not use a buggy M4.
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52 m4_if(m4_index([..wi.d.], [.d.]), [-1],
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53 [m4_fatal(m4_do([m4 with buggy strstr detected. Please install
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54 GNU M4 1.4.16 or newer and set the M4 environment variable]))])
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55
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56
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57 dnl Fix 2.64 cross compile detection for AVR and RTEMS
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58 dnl by not trying to compile fopen.
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59 m4_if(m4_defn([m4_PACKAGE_VERSION]), [2.64],
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60 [m4_foreach([_GCC_LANG], [C, C++, Fortran, Fortran 77],
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61 [m4_define([_AC_LANG_IO_PROGRAM(]_GCC_LANG[)], m4_defn([AC_LANG_PROGRAM(]_GCC_LANG[)]))])])
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62
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63 m4_version_prereq([2.66],, [
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64 dnl We need AC_CHECK_DECL which works for overloaded C++ functions.
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65
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66 # _AC_CHECK_DECL_BODY
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67 # -------------------
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68 # Shell function body for AC_CHECK_DECL.
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69 m4_define([_AC_CHECK_DECL_BODY],
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70 [ AS_LINENO_PUSH([$[]1])
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71 [as_decl_name=`echo $][2|sed 's/ *(.*//'`]
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72 [as_decl_use=`echo $][2|sed -e 's/(/((/' -e 's/)/) 0&/' -e 's/,/) 0& (/g'`]
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73 AC_CACHE_CHECK([whether $as_decl_name is declared], [$[]3],
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74 [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([$[]4],
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75 [@%:@ifndef $[]as_decl_name
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76 @%:@ifdef __cplusplus
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77 (void) $[]as_decl_use;
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78 @%:@else
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79 (void) $[]as_decl_name;
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80 @%:@endif
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81 @%:@endif
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82 ])],
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83 [AS_VAR_SET([$[]3], [yes])],
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84 [AS_VAR_SET([$[]3], [no])])])
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85 AS_LINENO_POP
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86 ])# _AC_CHECK_DECL_BODY
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87
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88 # _AC_CHECK_DECLS(SYMBOL, ACTION-IF_FOUND, ACTION-IF-NOT-FOUND,
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89 # INCLUDES)
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90 # -------------------------------------------------------------
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91 # Helper to AC_CHECK_DECLS, which generates the check for a single
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92 # SYMBOL with INCLUDES, performs the AC_DEFINE, then expands
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93 # ACTION-IF-FOUND or ACTION-IF-NOT-FOUND.
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94 m4_define([_AC_CHECK_DECLS],
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95 [AC_CHECK_DECL([$1], [ac_have_decl=1], [ac_have_decl=0], [$4])]dnl
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96 [AC_DEFINE_UNQUOTED(AS_TR_CPP(m4_bpatsubst(HAVE_DECL_[$1],[ *(.*])),
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97 [$ac_have_decl],
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98 [Define to 1 if you have the declaration of `$1',
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99 and to 0 if you don't.])]dnl
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100 [m4_ifvaln([$2$3], [AS_IF([test $ac_have_decl = 1], [$2], [$3])])])
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101
0
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102 ])
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103
111
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104 dnl If flex/lex are not found, the top level configure sets LEX to
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105 dnl "/path_to/missing flex". When AC_PROG_LEX tries to find the flex
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106 dnl output file, it calls $LEX to do so, but the current lightweight
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107 dnl "missing" won't create a file. This results in an error.
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108 dnl Avoid calling the bulk of AC_PROG_LEX when $LEX is "missing".
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109 AC_DEFUN_ONCE([AC_PROG_LEX],
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110 [AC_CHECK_PROGS(LEX, flex lex, :)
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111 case "$LEX" in
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112 :|*"missing "*) ;;
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113 *) _AC_PROG_LEX_YYTEXT_DECL ;;
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114 esac])
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115
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116 ])