config/acx.m4

   1 # Autoconf M4 include file defining utility macros for complex Canadian
   2 # cross builds.
   3
   4 dnl ####
   5 dnl # _GCC_TOPLEV_NONCANONICAL_BUILD
   6 dnl # $build_alias or canonical $build if blank.
   7 dnl # Used when we would use $build_alias, but empty is not OK.
   8 AC_DEFUN([_GCC_TOPLEV_NONCANONICAL_BUILD],
   9 [AC_REQUIRE([AC_CANONICAL_BUILD]) []dnl
  10 case ${build_alias} in
  11   "") build_noncanonical=${build} ;;
  12   *) build_noncanonical=${build_alias} ;;
  13 esac
  14 ]) []dnl # _GCC_TOPLEV_NONCANONICAL_BUILD
  15
  16 dnl ####
  17 dnl # _GCC_TOPLEV_NONCANONICAL_HOST
  18 dnl # $host_alias, or $build_noncanonical if blank.
  19 dnl # Used when we would use $host_alias, but empty is not OK.
  20 AC_DEFUN([_GCC_TOPLEV_NONCANONICAL_HOST],
  21 [AC_REQUIRE([_GCC_TOPLEV_NONCANONICAL_BUILD]) []dnl
  22 case ${host_alias} in
  23   "") host_noncanonical=${build_noncanonical} ;;
  24   *) host_noncanonical=${host_alias} ;;
  25 esac
  26 ]) []dnl # _GCC_TOPLEV_NONCANONICAL_HOST
  27
  28 dnl ####
  29 dnl # _GCC_TOPLEV_NONCANONICAL_TARGET
  30 dnl # $target_alias or $host_noncanonical if blank.
  31 dnl # Used when we would use $target_alias, but empty is not OK.
  32 AC_DEFUN([_GCC_TOPLEV_NONCANONICAL_TARGET],
  33 [AC_REQUIRE([_GCC_TOPLEV_NONCANONICAL_HOST]) []dnl
  34 case ${target_alias} in
  35   "") target_noncanonical=${host_noncanonical} ;;
  36   *) target_noncanonical=${target_alias} ;;
  37 esac
  38 ]) []dnl # _GCC_TOPLEV_NONCANONICAL_TARGET
  39
  40 dnl ####
  41 dnl # GCC_TOPLEV_SUBDIRS
  42 dnl # GCC & friends build 'build', 'host', and 'target' tools.  These must
  43 dnl # be separated into three well-known subdirectories of the build directory:
  44 dnl # build_subdir, host_subdir, and target_subdir.  The values are determined
  45 dnl # here so that they can (theoretically) be changed in the future.  They
  46 dnl # were previously reproduced across many different files.
  47 dnl #
  48 dnl # This logic really amounts to very little with autoconf 2.13; it will
  49 dnl # amount to a lot more with autoconf 2.5x.
  50 AC_DEFUN([GCC_TOPLEV_SUBDIRS],
  51 [AC_REQUIRE([_GCC_TOPLEV_NONCANONICAL_TARGET]) []dnl
  52 AC_REQUIRE([_GCC_TOPLEV_NONCANONICAL_BUILD]) []dnl
  53 # Prefix 'build-' so this never conflicts with target_subdir.
  54 build_subdir="build-${build_noncanonical}"
  55 # Not really a subdirectory, but here for completeness.
  56 host_subdir=.
  57 # No prefix.
  58 target_subdir=${target_noncanonical}
  59 AC_SUBST([build_subdir]) []dnl
  60 AC_SUBST([host_subdir]) []dnl
  61 AC_SUBST([target_subdir]) []dnl
  62 ]) []dnl # GCC_TOPLEV_SUBDIRS
  63
  64
  65 ####
  66 # _NCN_TOOL_PREFIXES:  Some stuff that oughtta be done in AC_CANONICAL_SYSTEM
  67 # or AC_INIT.
  68 # These demand that AC_CANONICAL_SYSTEM be called beforehand.
  69 AC_DEFUN([_NCN_TOOL_PREFIXES],
  70 [ncn_tool_prefix=
  71 test -n "$host_alias" && ncn_tool_prefix=$host_alias-
  72 ncn_target_tool_prefix=
  73 test -n "$target_alias" && ncn_target_tool_prefix=$target_alias-
  74 ]) []dnl # _NCN_TOOL_PREFIXES
  75
  76 ####
  77 # NCN_CHECK_TARGET_TOOL(variable, prog-to-check-for,[value-if-not-found],[path])
  78 # Like AC_CHECK_TOOL, but tries a prefix of the target, not the host.
  79 # Code is pretty much lifted from autoconf2.53.
  80
  81 AC_DEFUN([NCN_CHECK_TARGET_TOOL],
  82 [AC_REQUIRE([_NCN_TOOL_PREFIXES]) []dnl
  83 if test -n "$ncn_target_tool_prefix"; then
  84   AC_CHECK_PROG([$1], [${ncn_target_tool_prefix}$2],
  85                 [${ncn_target_tool_prefix}$2], , [$4])
  86 fi
  87 if test -z "$ac_cv_prog_$1" ; then
  88   ncn_cv_$1=$$1
  89   AC_CHECK_PROG([ncn_cv_$1], [$2], [$2], [$3], [$4])
  90   $1=$ncn_cv_$1
  91 else
  92   $1="$ac_cv_prog_$1"
  93 fi
  94 ]) []dnl # NCN_CHECK_TARGET_TOOL
  95
  96
  97 ####
  98 # NCN_STRICT_CHECK_TOOL(variable, prog-to-check-for,[value-if-not-found],[path])
  99 # Like AC_CHECK_TOOL, but requires the prefix if build!=host.
 100
 101 AC_DEFUN([NCN_STRICT_CHECK_TOOL],
 102 [AC_REQUIRE([_NCN_TOOL_PREFIXES]) []dnl
 103 if test -n "$ncn_tool_prefix"; then
 104   AC_CHECK_PROG([$1], [${ncn_tool_prefix}$2],
 105                 [${ncn_tool_prefix}$2], , [$4])
 106 fi
 107 if test -z "$ac_cv_prog_$1" ; then
 108   if test $build = $host ; then
 109     ncn_cv_$1=$$1
 110     AC_CHECK_PROG([ncn_cv_$1], [$2], [$2], [ifelse([$3],[],[$2],[$3])], [$4])
 111     $1=$ncn_cv_$1
 112   else
 113     $1="ifelse([$3],[],[${ncn_tool_prefix}$2],[$3])"
 114   fi
 115 else
 116   $1="$ac_cv_prog_$1"
 117 fi
 118 ]) []dnl # NCN_STRICT_CHECK_TOOL
 119
 120
 121 ####
 122 # NCN_STRICT_CHECK_TARGET_TOOL(variable, prog-to-check-for,[value-if-not-found],[path])
 123 # Like NCN_CHECK_TARGET_TOOL, but requires the prefix if build!=target.
 124
 125 AC_DEFUN([NCN_STRICT_CHECK_TARGET_TOOL],
 126 [AC_REQUIRE([_NCN_TOOL_PREFIXES]) []dnl
 127 if test -n "$ncn_target_tool_prefix"; then
 128   AC_CHECK_PROG([$1], [${ncn_target_tool_prefix}$2],
 129                 [${ncn_target_tool_prefix}$2], , [$4])
 130 fi
 131 if test -z "$ac_cv_prog_$1" ; then
 132   if test $build = $target ; then
 133     ncn_cv_$1=$$1
 134     AC_CHECK_PROG([ncn_cv_$1], [$2], [$2], [ifelse([$3],[],[$2],[$3])], [$4])
 135     $1=$ncn_cv_$1
 136   else
 137     $1="ifelse([$3],[],[${ncn_target_tool_prefix}$2],[$3])"
 138   fi
 139 else
 140   $1="$ac_cv_prog_$1"
 141 fi
 142 ]) []dnl # NCN_STRICT_CHECK_TARGET_TOOL
 143
 144 ###
 145 # AC_PROG_CPP_WERROR
 146 # Used for autoconf 2.5x to force AC_PREPROC_IFELSE to reject code which
 147 # triggers warnings from the preprocessor.  Will be in autoconf 2.58.
 148 # For now, using this also overrides header checks to use only the
 149 # preprocessor (matches 2.13 behavior; matching 2.58's behavior is a
 150 # bit harder from here).
 151 # Eventually autoconf will default to checking headers with the compiler
 152 # instead, and we'll have to do this differently.
 153
 154 AC_DEFUN([AC_PROG_CPP_WERROR],
 155 [AC_REQUIRE([AC_PROG_CPP])dnl
 156 m4_define([AC_CHECK_HEADER],m4_defn([_AC_CHECK_HEADER_OLD]))
 157 ac_c_preproc_warn_flag=yes])# AC_PROG_CPP_WERROR