[COMMITTED] Move libsanitizer configure logic to subdirectory

diff --git a/ChangeLog b/ChangeLog
index bb42398..d1302b3 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@ 
+2012-11-13  Richard Henderson  <rth@redhat.com>
+
+	* configure.ac: Move libsanitizer logic to subdirectory.
+	* configure: Regenerate.
+
 2012-11-13  Dodji Seketeli  <dodji@redhat.com>
 
 	* configure.ac: Enable libsanitizer just on x86 linux for now.
diff --git a/configure b/configure
index 39df09f..45e521e 100755
--- a/configure
+++ b/configure
@@ -3196,6 +3196,25 @@  $as_echo "yes" >&6; }
     fi
 fi
 
+# Disable libsanitizer on unsupported systems.
+if test -d ${srcdir}/libsanitizer; then
+    if test x$enable_libsanitizer = x; then
+	{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for libsanitizer support" >&5
+$as_echo_n "checking for libsanitizer support... " >&6; }
+	if (srcdir=${srcdir}/libsanitizer; \
+		. ${srcdir}/configure.tgt; \
+		test -n "$UNSUPPORTED")
+	then
+	    { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+	    noconfigdirs="$noconfigdirs target-libsanitizer"
+	else
+	    { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
+$as_echo "yes" >&6; }
+	fi
+    fi
+fi
+
 # Disable libquadmath for some systems.
 case "${target}" in
   avr-*-*)
@@ -3208,15 +3227,6 @@  case "${target}" in
     ;;
 esac
 
-# Disable libsanitizer on all systems but x86 linux for now.
-case "${target}" in
-  x86_64-*-linux-* | i?86-*-linux-*)
-    ;;
-  *)
-    noconfigdirs="$noconfigdirs target-libsanitizer"
-    ;;
-esac
-
 # Disable libssp for some systems.
 case "${target}" in
   avr-*-*)
diff --git a/configure.ac b/configure.ac
index 6c1b008..91ccb3d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -538,6 +538,22 @@  if test -d ${srcdir}/libitm; then
     fi
 fi
 
+# Disable libsanitizer on unsupported systems.
+if test -d ${srcdir}/libsanitizer; then
+    if test x$enable_libsanitizer = x; then
+	AC_MSG_CHECKING([for libsanitizer support])
+	if (srcdir=${srcdir}/libsanitizer; \
+		. ${srcdir}/configure.tgt; \
+		test -n "$UNSUPPORTED")
+	then
+	    AC_MSG_RESULT([no])
+	    noconfigdirs="$noconfigdirs target-libsanitizer"
+	else
+	    AC_MSG_RESULT([yes])
+	fi
+    fi
+fi
+
 # Disable libquadmath for some systems.
 case "${target}" in
   avr-*-*)
@@ -550,15 +566,6 @@  case "${target}" in
     ;;
 esac
 
-# Disable libsanitizer on all systems but x86 linux for now.
-case "${target}" in
-  x86_64-*-linux-* | i?86-*-linux-*)
-    ;;
-  *)
-    noconfigdirs="$noconfigdirs target-libsanitizer"
-    ;;
-esac
-
 # Disable libssp for some systems.
 case "${target}" in
   avr-*-*)
diff --git a/libsanitizer/ChangeLog.asan b/libsanitizer/ChangeLog.asan
index 5592092..a12e908 100644
--- a/libsanitizer/ChangeLog.asan
+++ b/libsanitizer/ChangeLog.asan
@@ -1,3 +1,7 @@ 
+2012-11-13  Richard Henderson  <rth@redhat.com>
+
+	* configure.tgt: New file.
+
 2012-11-12  David S. Miller  <davem@davemloft.net>
 
 	* asan/asan_linux.cc (GetPcSpBp): Add sparc support.
diff --git a/libsanitizer/configure.tgt b/libsanitizer/configure.tgt
new file mode 100644
index 0000000..ca7ac1f
--- /dev/null
+++ b/libsanitizer/configure.tgt
@@ -0,0 +1,28 @@ 
+# -*- shell-script -*-
+#   Copyright (C) 2012 Free Software Foundation, Inc.
+
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not see <http://www.gnu.org/licenses/>.
+
+# This is the target specific configuration file.  This is invoked by the
+# autoconf generated configure script.  Putting it in a separate shell file
+# lets us skip running autoconf when modifying target specific information.
+
+# Filter out unsupported systems.
+case "${target}" in
+  x86_64-*-linux* | i?86-*-linux*)
+	;;
+  *)
+	UNSUPPORTED=1
+	;;
+esac