--- gforth/configure.in	2010/12/27 18:13:39	1.286
+++ gforth/configure.in	2011/11/15 12:56:28	1.291
@@ -1,6 +1,6 @@
 dnl Process this file with autoconf to produce a configure script.
 
-#Copyright (C) 1995,1996,1997,1998,2000,2003,2004,2005,2006,2007,2008,2009 Free Software Foundation, Inc.
+#Copyright (C) 1995,1996,1997,1998,2000,2003,2004,2005,2006,2007,2008,2009,2010 Free Software Foundation, Inc.
 
 #This file is part of Gforth.
 
@@ -71,6 +71,7 @@ if test "$withval" = "yes"; then DEBUGFL
 GCC_LD="\$(GCC)"
 EC_MODE="false"
 NO_EC=""
+NO_CROSS=""
 EC=""
 engine2='engine2$(OPT).o'
 engine_fast2='engine-fast2$(OPT).o'
@@ -90,6 +91,7 @@ else
   EC_MODE="true"
   EC="-ec"
   NO_EC="#"
+  NO_CROSS="#"
   engine2=""
   engine_fast2=""
   no_dynamic="-DNO_DYNAMIC"
@@ -108,6 +110,23 @@ else
   platform=${withval}
 fi])
 
+AC_ARG_WITH(cross,
+	AC_HELP_STRING([--with-cross=<arch>],
+			[  Build gforth using a cross compiler.]),
+[if test "$withval" = "no"; then
+  echo "defining hosted system"
+else
+  echo "defining cross compiled system (${withval})"
+  if test -f "arch/$host_cpu/${withval}/config.sh"; then
+    source "arch/$host_cpu/${withval}/config.sh"
+  fi
+  GCC_PATH=$(which $CC)
+  LIB_PATH=${GCC_PATH%/*/*}
+  platform=${withval}
+  NO_EC=""
+  NO_CROSS="#"
+fi])
+
 #variables mentioned in INSTALL
 AC_ARG_VAR(CC, [The C compiler (must support GNU C 2.x).])
 AC_ARG_VAR(FORTHSIZES, [Gforth command line options for the default stack and dictionary sizes (see INSTALL).])
@@ -172,6 +191,7 @@ AC_SUBST(GCC_LD)
 AC_SUBST(DEBUGFLAG)
 AC_SUBST(EC)
 AC_SUBST(NO_EC)
+AC_SUBST(NO_CROSS)
 AC_SUBST(EC_MODE)
 AC_SUBST(engine2)
 AC_SUBST(engine_fast2)
@@ -669,6 +689,12 @@ AC_TRY_COMPILE(,[int __attribute__((unus
 AC_DEFINE_UNQUOTED(MAYBE_UNUSED,$MAYBE_UNUSED,[attribute for possibly unused variables])
 AC_MSG_RESULT($MAYBE_UNUSED)
 
+# Try if GCC understands __thread
+AC_MSG_CHECKING([whether gcc understands '__thread'])
+AC_TRY_COMPILE(,[extern __thread int foo;],PER_THREAD='__thread',)
+AC_DEFINE_UNQUOTED(PER_THREAD,$PER_THREAD,[storage class for thread-local variables])
+AC_MSG_RESULT($PER_THREAD)
+
 #try if m4 understands -s
 AC_MSG_CHECKING([how to invoke m4])
 if m4 -s /dev/null >/dev/null 2>&1; then
@@ -887,6 +913,11 @@ AC_PROG_LN_S
 AC_PROG_INSTALL
 AC_CHECK_PROGS(TEXI2DVI,texi2dvi4a2ps texi2dvi)
 
+dnl check for the presence of Emacs
+AC_CHECK_PROGS(EMACS,emacs xemacs)
+test -n "$EMACS" && gforth_elc=gforth.elc
+AC_SUBST(gforth_elc)
+
 dnl MacOS X has a libtool that does something else
 AC_CHECK_PROGS(GNU_LIBTOOL,"glibtool --tag=CC" libtool)