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
 158
 159 # Test for GNAT.
 160 # We require the gnatbind program, and a compiler driver that
 161 # understands Ada.  We use the user's CC setting, already found.
 162 #
 163 # Sets the shell variable have_gnat to yes or no as appropriate, and
 164 # substitutes GNATBIND.
 165 AC_DEFUN([ACX_PROG_GNAT],
 166 [AC_REQUIRE([AC_CHECK_TOOL_PREFIX])
 167 AC_REQUIRE([AC_PROG_CC])
 168 AC_CHECK_TOOL(GNATBIND, gnatbind, no)
 169 AC_CACHE_CHECK([whether compiler driver understands Ada],
 170                  acx_cv_cc_gcc_supports_ada,
 171 [cat >conftest.adb <<EOF
 172 procedure conftest is begin null; end conftest;
 173 EOF
 174 acx_cv_cc_gcc_supports_ada=no
 175 # There is a bug in old released versions of GCC which causes the
 176 # driver to exit successfully when the appropriate language module
 177 # has not been installed.  This is fixed in 2.95.4, 3.0.2, and 3.1.
 178 # Therefore we must check for the error message as well as an
 179 # unsuccessful exit.
 180 # Other compilers, like HP Tru64 UNIX cc, exit successfully when
 181 # given a .adb file, but produce no object file.  So we must check
 182 # if an object file was really produced to guard against this.
 183 errors=`(${CC} -c conftest.adb) 2>&1 || echo failure`
 184 if test x"$errors" = x && test -f conftest.$ac_objext; then
 185   acx_cv_cc_gcc_supports_ada=yes
 186   break
 187 fi
 188 rm -f conftest.*])
 189
 190 if test x$GNATBIND != xno && test x$acx_cv_cc_gcc_supports_ada != xno; then
 191   have_gnat=yes
 192 else
 193   have_gnat=no
 194 fi
 195 ])
 196
 197 dnl 'make compare' can be significantly faster, if cmp itself can
 198 dnl skip bytes instead of using tail.  The test being performed is
 199 dnl "if cmp --ignore-initial=2 t1 t2 && ! cmp --ignore-initial=1 t1 t2"
 200 dnl but we need to sink errors and handle broken shells.  We also test
 201 dnl for the parameter format "cmp file1 file2 skip1 skip2" which is
 202 dnl accepted by cmp on some systems.
 203 AC_DEFUN([ACX_PROG_CMP_IGNORE_INITIAL],
 204 [AC_CACHE_CHECK([how to compare bootstrapped objects], gcc_cv_prog_cmp_skip,
 205 [ echo abfoo >t1
 206   echo cdfoo >t2
 207   gcc_cv_prog_cmp_skip='tail +16c $$f1 > tmp-foo1; tail +16c $$f2 > tmp-foo2; cmp tmp-foo1 tmp-foo2'
 208   if cmp t1 t2 2 2 > /dev/null 2>&1; then
 209     if cmp t1 t2 1 1 > /dev/null 2>&1; then
 210       :
 211     else
 212       gcc_cv_prog_cmp_skip='cmp $$f1 $$f2 16 16'
 213     fi
 214   fi
 215   if cmp --ignore-initial=2 t1 t2 > /dev/null 2>&1; then
 216     if cmp --ignore-initial=1 t1 t2 > /dev/null 2>&1; then
 217       :
 218     else
 219       gcc_cv_prog_cmp_skip='cmp --ignore-initial=16 $$f1 $$f2'
 220     fi
 221   fi
 222   rm t1 t2
 223 ])
 224 do_compare="$gcc_cv_prog_cmp_skip"
 225 AC_SUBST(do_compare)
 226 ])