* acx.m4 (AC_PROG_CPP_WERROR): New.

[pf3gnuchains/gcc-fork.git] / config / acx.m4

diff --git a/config/acx.m4 b/config/acx.m4
index 36bc9be..96b7c8a 100644 (file)
--- a/config/acx.m4
+++ b/config/acx.m4
@@ -1,6 +1,67 @@
 # Autoconf M4 include file defining utility macros for complex Canadian
 # cross builds.
 
+dnl ####
+dnl # _GCC_TOPLEV_NONCANONICAL_BUILD
+dnl # $build_alias or canonical $build if blank.
+dnl # Used when we would use $build_alias, but empty is not OK.
+AC_DEFUN([_GCC_TOPLEV_NONCANONICAL_BUILD],
+[AC_REQUIRE([AC_CANONICAL_BUILD]) []dnl
+case ${build_alias} in
+  "") build_noncanonical=${build} ;;
+  *) build_noncanonical=${build_alias} ;;
+esac
+]) []dnl # _GCC_TOPLEV_NONCANONICAL_BUILD
+
+dnl ####
+dnl # _GCC_TOPLEV_NONCANONICAL_HOST
+dnl # $host_alias, or $build_noncanonical if blank.
+dnl # Used when we would use $host_alias, but empty is not OK.
+AC_DEFUN([_GCC_TOPLEV_NONCANONICAL_HOST],
+[AC_REQUIRE([_GCC_TOPLEV_NONCANONICAL_BUILD]) []dnl
+case ${host_alias} in
+  "") host_noncanonical=${build_noncanonical} ;;
+  *) host_noncanonical=${host_alias} ;;
+esac
+]) []dnl # _GCC_TOPLEV_NONCANONICAL_HOST
+
+dnl ####
+dnl # _GCC_TOPLEV_NONCANONICAL_TARGET
+dnl # $target_alias or $host_noncanonical if blank.
+dnl # Used when we would use $target_alias, but empty is not OK.
+AC_DEFUN([_GCC_TOPLEV_NONCANONICAL_TARGET],
+[AC_REQUIRE([_GCC_TOPLEV_NONCANONICAL_HOST]) []dnl
+case ${target_alias} in
+  "") target_noncanonical=${host_noncanonical} ;;
+  *) target_noncanonical=${target_alias} ;;
+esac
+]) []dnl # _GCC_TOPLEV_NONCANONICAL_TARGET
+
+dnl ####
+dnl # GCC_TOPLEV_SUBDIRS
+dnl # GCC & friends build 'build', 'host', and 'target' tools.  These must
+dnl # be separated into three well-known subdirectories of the build directory:
+dnl # build_subdir, host_subdir, and target_subdir.  The values are determined
+dnl # here so that they can (theoretically) be changed in the future.  They
+dnl # were previously reproduced across many different files.
+dnl #
+dnl # This logic really amounts to very little with autoconf 2.13; it will
+dnl # amount to a lot more with autoconf 2.5x.
+AC_DEFUN([GCC_TOPLEV_SUBDIRS],
+[AC_REQUIRE([_GCC_TOPLEV_NONCANONICAL_TARGET]) []dnl
+AC_REQUIRE([_GCC_TOPLEV_NONCANONICAL_BUILD]) []dnl
+# Prefix 'build-' so this never conflicts with target_subdir.
+build_subdir="build-${build_noncanonical}"
+# Not really a subdirectory, but here for completeness.
+host_subdir=.
+# No prefix.
+target_subdir=${target_noncanonical}
+AC_SUBST([build_subdir]) []dnl
+AC_SUBST([host_subdir]) []dnl
+AC_SUBST([target_subdir]) []dnl
+]) []dnl # GCC_TOPLEV_SUBDIRS
+
+
 ####
 # _NCN_TOOL_PREFIXES:  Some stuff that oughtta be done in AC_CANONICAL_SYSTEM 
 # or AC_INIT.
@@ -24,9 +85,9 @@ if test -n "$ncn_target_tool_prefix"; then
                 [${ncn_target_tool_prefix}$2], , [$4])
 fi
 if test -z "$ac_cv_prog_$1" ; then
-  ncn_ct_$1=$$1
-  AC_CHECK_PROG([ncn_ct_$1], [$2], [$2], [$3], [$4])
-  $1=$ncn_ct_$1
+  ncn_cv_$1=$$1
+  AC_CHECK_PROG([ncn_cv_$1], [$2], [$2], [$3], [$4])
+  $1=$ncn_cv_$1
 else
   $1="$ac_cv_prog_$1"
 fi
@@ -45,11 +106,11 @@ if test -n "$ncn_tool_prefix"; then
 fi
 if test -z "$ac_cv_prog_$1" ; then
   if test $build = $host ; then
-    ncn_ct_$1=$$1
-    AC_CHECK_PROG([ncn_ct_$1], [$2], [$2], [$3], [$4]) 
-    $1=$ncn_ct_$1
+    ncn_cv_$1=$$1
+    AC_CHECK_PROG([ncn_cv_$1], [$2], [$2], [ifelse([$3],[],[$2],[$3])], [$4]) 
+    $1=$ncn_cv_$1
   else
-    $1="$3"
+    $1="ifelse([$3],[],[${ncn_tool_prefix}$2],[$3])"
   fi
 else
   $1="$ac_cv_prog_$1"
@@ -69,15 +130,28 @@ if test -n "$ncn_target_tool_prefix"; then
 fi
 if test -z "$ac_cv_prog_$1" ; then
   if test $build = $target ; then
-    ncn_ct_$1=$$1
-    AC_CHECK_PROG([ncn_ct_$1], [$2], [$2], [$3], [$4]) 
-    $1=$ncn_ct_$1
+    ncn_cv_$1=$$1
+    AC_CHECK_PROG([ncn_cv_$1], [$2], [$2], [ifelse([$3],[],[$2],[$3])], [$4]) 
+    $1=$ncn_cv_$1
   else
-    $1="$3"
+    $1="ifelse([$3],[],[${ncn_target_tool_prefix}$2],[$3])"
   fi
 else
   $1="$ac_cv_prog_$1"
 fi
 ]) []dnl # NCN_STRICT_CHECK_TARGET_TOOL
 
+###
+# AC_PROG_CPP_WERROR
+# Used for autoconf 2.5x to force AC_PREPROC_IFELSE to reject code which
+# triggers warnings from the preprocessor.  Will be in autoconf 2.58.
+# For now, using this also overrides header checks to use only the
+# preprocessor (matches 2.13 behavior; matching 2.58's behavior is a
+# bit harder from here).
+# Eventually autoconf will default to checking headers with the compiler
+# instead, and we'll have to do this differently.
 
+AC_DEFUN([AC_PROG_CPP_WERROR],
+[AC_REQUIRE([AC_PROG_CPP])dnl
+m4_define([AC_CHECK_HEADER],m4_defn([_AC_CHECK_HEADER_OLD]))
+ac_c_preproc_warn_flag=yes])# AC_PROG_CPP_WERROR