[Bug 3511806] Compiler checks too early

This change allows to build the cygwin
and mingw32 ports of Tcl/Tk to build
out-of-the-box using a native or cross-
compiler.

3 files changed, 486 insertions, 119 deletions

diff --git a/win/configure b/win/configure
index 7cddb40..27ca399 100755
--- a/win/configure
+++ b/win/configure
@@ -934,16 +934,40 @@ fi
 
 
 #--------------------------------------------------------------------
-# Perform additinal compiler tests.
+# Determines the correct binary file extension (.o, .obj, .exe etc.)
 #--------------------------------------------------------------------
 
+echo $ac_n "checking for object suffix""... $ac_c" 1>&6
+echo "configure:942: checking for object suffix" >&5
+if eval "test \"`echo '$''{'ac_cv_objext'+set}'`\" = set"; then
+  echo $ac_n "(cached) $ac_c" 1>&6
+else
+  rm -f conftest*
+echo 'int i = 1;' > conftest.$ac_ext
+if { (eval echo configure:948: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+  for ac_file in conftest.*; do
+    case $ac_file in
+    *.c) ;;
+    *) ac_cv_objext=`echo $ac_file | sed -e s/conftest.//` ;;
+    esac
+  done
+else
+  { echo "configure: error: installation or configuration problem; compiler does not work" 1>&2; exit 1; }
+fi
+rm -f conftest*
+fi
+
+echo "$ac_t""$ac_cv_objext" 1>&6
+OBJEXT=$ac_cv_objext
+ac_objext=$ac_cv_objext
+
 echo $ac_n "checking for Cygwin environment""... $ac_c" 1>&6
-echo "configure:942: checking for Cygwin environment" >&5
+echo "configure:966: checking for Cygwin environment" >&5
 if eval "test \"`echo '$''{'ac_cv_cygwin'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 947 "configure"
+#line 971 "configure"
 #include "confdefs.h"
 
 int main() {
@@ -954,7 +978,7 @@ int main() {
 return __CYGWIN__;
 ; return 0; }
 EOF
-if { (eval echo configure:958: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:982: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   ac_cv_cygwin=yes
 else
@@ -970,49 +994,20 @@ fi
 echo "$ac_t""$ac_cv_cygwin" 1>&6
 CYGWIN=
 test "$ac_cv_cygwin" = yes && CYGWIN=yes
-
-#--------------------------------------------------------------------
-# Determines the correct binary file extension (.o, .obj, .exe etc.)
-#--------------------------------------------------------------------
-
-echo $ac_n "checking for object suffix""... $ac_c" 1>&6
-echo "configure:980: checking for object suffix" >&5
-if eval "test \"`echo '$''{'ac_cv_objext'+set}'`\" = set"; then
-  echo $ac_n "(cached) $ac_c" 1>&6
-else
-  rm -f conftest*
-echo 'int i = 1;' > conftest.$ac_ext
-if { (eval echo configure:986: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
-  for ac_file in conftest.*; do
-    case $ac_file in
-    *.c) ;;
-    *) ac_cv_objext=`echo $ac_file | sed -e s/conftest.//` ;;
-    esac
-  done
-else
-  { echo "configure: error: installation or configuration problem; compiler does not work" 1>&2; exit 1; }
-fi
-rm -f conftest*
-fi
-
-echo "$ac_t""$ac_cv_objext" 1>&6
-OBJEXT=$ac_cv_objext
-ac_objext=$ac_cv_objext
-
 echo $ac_n "checking for mingw32 environment""... $ac_c" 1>&6
-echo "configure:1004: checking for mingw32 environment" >&5
+echo "configure:999: checking for mingw32 environment" >&5
 if eval "test \"`echo '$''{'ac_cv_mingw32'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 1009 "configure"
+#line 1004 "configure"
 #include "confdefs.h"
 
 int main() {
 return __MINGW32__;
 ; return 0; }
 EOF
-if { (eval echo configure:1016: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:1011: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   ac_cv_mingw32=yes
 else
@@ -1031,7 +1026,7 @@ test "$ac_cv_mingw32" = yes && MINGW32=yes
 
 
 echo $ac_n "checking for executable suffix""... $ac_c" 1>&6
-echo "configure:1035: checking for executable suffix" >&5
+echo "configure:1030: checking for executable suffix" >&5
 if eval "test \"`echo '$''{'ac_cv_exeext'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -1041,7 +1036,7 @@ else
   rm -f conftest*
   echo 'int main () { return 0; }' > conftest.$ac_ext
   ac_cv_exeext=
-  if { (eval echo configure:1045: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; }; then
+  if { (eval echo configure:1040: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; }; then
     for file in conftest.*; do
       case $file in
       *.c | *.o | *.obj) ;;
@@ -1068,7 +1063,7 @@ ac_exeext=$EXEEXT
 
 
     echo $ac_n "checking for building with threads""... $ac_c" 1>&6
-echo "configure:1072: checking for building with threads" >&5
+echo "configure:1067: checking for building with threads" >&5
     # Check whether --enable-threads or --disable-threads was given.
 if test "${enable_threads+set}" = set; then
   enableval="$enable_threads"
@@ -1105,7 +1100,7 @@ EOF
 
 
     echo $ac_n "checking how to build libraries""... $ac_c" 1>&6
-echo "configure:1109: checking how to build libraries" >&5
+echo "configure:1104: checking how to build libraries" >&5
     # Check whether --enable-shared or --disable-shared was given.
 if test "${enable_shared+set}" = set; then
   enableval="$enable_shared"
@@ -1146,7 +1141,7 @@ EOF
     # Step 0: Enable 64 bit support?
 
     echo $ac_n "checking if 64bit support is requested""... $ac_c" 1>&6
-echo "configure:1150: checking if 64bit support is requested" >&5
+echo "configure:1145: checking if 64bit support is requested" >&5
     # Check whether --enable-64bit or --disable-64bit was given.
 if test "${enable_64bit+set}" = set; then
   enableval="$enable_64bit"
@@ -1160,7 +1155,7 @@ fi
     # Cross-compiling options for Windows/CE builds
 
     echo $ac_n "checking if Windows/CE build is requested""... $ac_c" 1>&6
-echo "configure:1164: checking if Windows/CE build is requested" >&5
+echo "configure:1159: checking if Windows/CE build is requested" >&5
     # Check whether --enable-wince or --disable-wince was given.
 if test "${enable_wince+set}" = set; then
   enableval="$enable_wince"
@@ -1172,7 +1167,7 @@ fi
     echo "$ac_t""$doWince" 1>&6
 
     echo $ac_n "checking for Windows/CE celib directory""... $ac_c" 1>&6
-echo "configure:1176: checking for Windows/CE celib directory" >&5
+echo "configure:1171: checking for Windows/CE celib directory" >&5
     # Check whether --with-celib or --without-celib was given.
 if test "${with_celib+set}" = set; then
   withval="$with_celib"
@@ -1189,7 +1184,7 @@ fi
     # Extract the first word of "cygpath", so it can be a program name with args.
 set dummy cygpath; ac_word=$2
 echo $ac_n "checking for $ac_word""... $ac_c" 1>&6
-echo "configure:1193: checking for $ac_word" >&5
+echo "configure:1188: checking for $ac_word" >&5
 if eval "test \"`echo '$''{'ac_cv_prog_CYGPATH'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -1223,6 +1218,57 @@ fi
     # which requires x86|amd64|ia64.
     MACHINE="X86"
 
+    echo $ac_n "checking for cross-compile version of gcc""... $ac_c" 1>&6
+echo "configure:1223: checking for cross-compile version of gcc" >&5
+if eval "test \"`echo '$''{'ac_cv_cross'+set}'`\" = set"; then
+  echo $ac_n "(cached) $ac_c" 1>&6
+else
+  cat > conftest.$ac_ext <<EOF
+#line 1228 "configure"
+#include "confdefs.h"
+
+	    #ifdef __WIN32__
+		#error cross-compiler
+	    #endif
+	
+int main() {
+
+; return 0; }
+EOF
+if { (eval echo configure:1239: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+  rm -rf conftest*
+  ac_cv_cross=yes
+else
+  echo "configure: failed program was:" >&5
+  cat conftest.$ac_ext >&5
+  rm -rf conftest*
+  ac_cv_cross=no
+fi
+rm -f conftest*
+    
+fi
+
+echo "$ac_t""$ac_cv_cross" 1>&6
+
+    if test "$ac_cv_cross" = "yes"; then
+	case "$do64bit" in
+	    amd64|x64|yes)
+		CC="x86_64-w64-mingw32-gcc"
+		LD="x86_64-w64-mingw32-ld"
+		AR="x86_64-w64-mingw32-ar"
+		RANLIB="x86_64-w64-mingw32-ranlib"
+		RC="x86_64-w64-mingw32-windres"
+	    ;;
+	    *)
+		CC="i686-w64-mingw32-gcc"
+		LD="i686-w64-mingw32-ld"
+		AR="i686-w64-mingw32-ar"
+		RANLIB="i686-w64-mingw32-ranlib"
+		RC="i686-w64-mingw32-windres"
+	    ;;
+	esac
+    fi
+
     # Check for a bug in gcc's windres that causes the
     # compile to fail when a Windows native path is
     # passed into windres. The mingw toolchain requires
@@ -1237,9 +1283,9 @@ fi
 	echo "END" >> $conftest
 
 	echo $ac_n "checking for Windows native path bug in windres""... $ac_c" 1>&6
-echo "configure:1241: checking for Windows native path bug in windres" >&5
+echo "configure:1287: checking for Windows native path bug in windres" >&5
 	cyg_conftest=`$CYGPATH $conftest`
-	if { ac_try='$RC -o conftest.res.o $cyg_conftest'; { (eval echo configure:1243: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }; } ; then
+	if { ac_try='$RC -o conftest.res.o $cyg_conftest'; { (eval echo configure:1289: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }; } ; then
 	    echo "$ac_t""no" 1>&6
 	else
 	    echo "$ac_t""yes" 1>&6
@@ -1249,7 +1295,7 @@ echo "configure:1241: checking for Windows native path bug in windres" >&5
 	cyg_conftest=
     fi
 
-    if test "$CYGPATH" = "echo" || test "$ac_cv_cygwin" = "yes"; then
+    if test "$CYGPATH" = "echo"; then
         DEPARG='"$<"'
     else
         DEPARG='"$(shell $(CYGPATH) $<)"'
@@ -1257,8 +1303,45 @@ echo "configure:1241: checking for Windows native path bug in windres" >&5
 
     # set various compiler flags depending on whether we are using gcc or cl
 
+    if test "${GCC}" = "yes" ; then
+	echo $ac_n "checking for mingw32 version of gcc""... $ac_c" 1>&6
+echo "configure:1309: checking for mingw32 version of gcc" >&5
+if eval "test \"`echo '$''{'ac_cv_win32'+set}'`\" = set"; then
+  echo $ac_n "(cached) $ac_c" 1>&6
+else
+  cat > conftest.$ac_ext <<EOF
+#line 1314 "configure"
+#include "confdefs.h"
+
+		#ifdef __WIN32__
+		    #error win32
+		#endif
+	    
+int main() {
+
+; return 0; }
+EOF
+if { (eval echo configure:1325: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+  rm -rf conftest*
+  ac_cv_win32=no
+else
+  echo "configure: failed program was:" >&5
+  cat conftest.$ac_ext >&5
+  rm -rf conftest*
+  ac_cv_win32=yes
+fi
+rm -f conftest*
+	
+fi
+
+echo "$ac_t""$ac_cv_win32" 1>&6
+	if test "$ac_cv_win32" != "yes"; then
+	    { echo "configure: error: ${CC} cannot produce win32 executables." 1>&2; exit 1; }
+	fi
+    fi
+
     echo $ac_n "checking compiler flags""... $ac_c" 1>&6
-echo "configure:1262: checking compiler flags" >&5
+echo "configure:1345: checking compiler flags" >&5
     if test "${GCC}" = "yes" ; then
 	SHLIB_LD=""
 	SHLIB_LD_LIBS=""
@@ -1278,25 +1361,6 @@ echo "configure:1262: checking compiler flags" >&5
 	extra_cflags="-pipe"
 	extra_ldflags="-pipe"
 
-	if test "$ac_cv_cygwin" = "yes"; then
-	    case "$do64bit" in
-		amd64|x64|yes)
-		    CC="x86_64-w64-mingw32-gcc"
-		    LD="x86_64-w64-mingw32-ld"
-		    AR="x86_64-w64-mingw32-ar"
-		    RANLIB="x86_64-w64-mingw32-ranlib"
-		    RC="x86_64-w64-mingw32-windres"
-		;;
-		*)
-		    CC="i686-w64-mingw32-gcc"
-		    LD="i686-w64-mingw32-ld"
-		    AR="i686-w64-mingw32-ar"
-		    RANLIB="i686-w64-mingw32-ranlib"
-		    RC="i686-w64-mingw32-windres"
-	    ;;
-	    esac
-	fi
-
 	if test "${SHARED_BUILD}" = "0" ; then
 	    # static
             echo "$ac_t""using static flags" 1>&6
@@ -1376,18 +1440,18 @@ echo "configure:1262: checking compiler flags" >&5
 		;;
 	    *)
 		cat > conftest.$ac_ext <<EOF
-#line 1380 "configure"
+#line 1444 "configure"
 #include "confdefs.h"
 
-			#ifdef _WIN64
+		    #ifdef _WIN64
 			#error 64-bit
-			#endif
+		    #endif
 		
 int main() {
 
 ; return 0; }
 EOF
-if { (eval echo configure:1391: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:1455: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   tcl_win_64bit=no
 else
@@ -1625,6 +1689,193 @@ EOF
 	fi
     fi
 
+    if test "${GCC}" = "yes" ; then
+	echo $ac_n "checking for SEH support in compiler""... $ac_c" 1>&6
+echo "configure:1695: checking for SEH support in compiler" >&5
+if eval "test \"`echo '$''{'tcl_cv_seh'+set}'`\" = set"; then
+  echo $ac_n "(cached) $ac_c" 1>&6
+else
+  if test "$cross_compiling" = yes; then
+  tcl_cv_seh=no
+else
+  cat > conftest.$ac_ext <<EOF
+#line 1703 "configure"
+#include "confdefs.h"
+
+	    #define WIN32_LEAN_AND_MEAN
+	    #include <windows.h>
+	    #undef WIN32_LEAN_AND_MEAN
+
+	    int main(int argc, char** argv) {
+		int a, b = 0;
+		__try {
+		    a = 666 / b;
+		}
+		__except (EXCEPTION_EXECUTE_HANDLER) {
+		    return 0;
+		}
+		return 1;
+	    }
+	
+EOF
+if { (eval echo configure:1722: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null
+then
+  tcl_cv_seh=yes
+else
+  echo "configure: failed program was:" >&5
+  cat conftest.$ac_ext >&5
+  rm -fr conftest*
+  tcl_cv_seh=no
+fi
+rm -fr conftest*
+fi
+
+	
+fi
+
+echo "$ac_t""$tcl_cv_seh" 1>&6
+	if test "$tcl_cv_seh" = "no" ; then
+	    cat >> confdefs.h <<\EOF
+#define HAVE_NO_SEH 1
+EOF
+
+	fi
+
+	#
+	# Check to see if the excpt.h include file provided contains the
+	# definition for EXCEPTION_DISPOSITION; if not, which is the case
+	# with Cygwin's version as of 2002-04-10, define it to be int,
+	# sufficient for getting the current code to work.
+	#
+	echo $ac_n "checking for EXCEPTION_DISPOSITION support in include files""... $ac_c" 1>&6
+echo "configure:1752: checking for EXCEPTION_DISPOSITION support in include files" >&5
+if eval "test \"`echo '$''{'tcl_cv_eh_disposition'+set}'`\" = set"; then
+  echo $ac_n "(cached) $ac_c" 1>&6
+else
+  cat > conftest.$ac_ext <<EOF
+#line 1757 "configure"
+#include "confdefs.h"
+
+#	    define WIN32_LEAN_AND_MEAN
+#	    include <windows.h>
+#	    undef WIN32_LEAN_AND_MEAN
+	    
+int main() {
+
+		EXCEPTION_DISPOSITION x;
+	    
+; return 0; }
+EOF
+if { (eval echo configure:1770: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+  rm -rf conftest*
+  tcl_cv_eh_disposition=yes
+else
+  echo "configure: failed program was:" >&5
+  cat conftest.$ac_ext >&5
+  rm -rf conftest*
+  tcl_cv_eh_disposition=no
+fi
+rm -f conftest*
+	
+fi
+
+echo "$ac_t""$tcl_cv_eh_disposition" 1>&6
+	if test "$tcl_cv_eh_disposition" = "no" ; then
+	cat >> confdefs.h <<\EOF
+#define EXCEPTION_DISPOSITION int
+EOF
+
+	fi
+
+	# Check to see if winnt.h defines CHAR, SHORT, and LONG
+	# even if VOID has already been #defined. The win32api
+	# used by mingw and cygwin is known to do this.
+
+	echo $ac_n "checking for winnt.h that ignores VOID define""... $ac_c" 1>&6
+echo "configure:1796: checking for winnt.h that ignores VOID define" >&5
+if eval "test \"`echo '$''{'tcl_cv_winnt_ignore_void'+set}'`\" = set"; then
+  echo $ac_n "(cached) $ac_c" 1>&6
+else
+  cat > conftest.$ac_ext <<EOF
+#line 1801 "configure"
+#include "confdefs.h"
+
+		#define VOID void
+		#define WIN32_LEAN_AND_MEAN
+		#include <windows.h>
+		#undef WIN32_LEAN_AND_MEAN
+	    
+int main() {
+
+		CHAR c;
+		SHORT s;
+		LONG l;
+	    
+; return 0; }
+EOF
+if { (eval echo configure:1817: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+  rm -rf conftest*
+  tcl_cv_winnt_ignore_void=yes
+else
+  echo "configure: failed program was:" >&5
+  cat conftest.$ac_ext >&5
+  rm -rf conftest*
+  tcl_cv_winnt_ignore_void=no
+fi
+rm -f conftest*
+	
+fi
+
+echo "$ac_t""$tcl_cv_winnt_ignore_void" 1>&6
+	if test "$tcl_cv_winnt_ignore_void" = "yes" ; then
+	    cat >> confdefs.h <<\EOF
+#define HAVE_WINNT_IGNORE_VOID 1
+EOF
+
+	fi
+
+	# See if the compiler supports casting to a union type.
+	# This is used to stop gcc from printing a compiler
+	# warning when initializing a union member.
+
+	echo $ac_n "checking for cast to union support""... $ac_c" 1>&6
+echo "configure:1843: checking for cast to union support" >&5
+if eval "test \"`echo '$''{'tcl_cv_cast_to_union'+set}'`\" = set"; then
+  echo $ac_n "(cached) $ac_c" 1>&6
+else
+  cat > conftest.$ac_ext <<EOF
+#line 1848 "configure"
+#include "confdefs.h"
+
+int main() {
+
+		  union foo { int i; double d; };
+		  union foo f = (union foo) (int) 0;
+	    
+; return 0; }
+EOF
+if { (eval echo configure:1858: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+  rm -rf conftest*
+  tcl_cv_cast_to_union=yes
+else
+  echo "configure: failed program was:" >&5
+  cat conftest.$ac_ext >&5
+  rm -rf conftest*
+  tcl_cv_cast_to_union=no
+fi
+rm -f conftest*
+	
+fi
+
+echo "$ac_t""$tcl_cv_cast_to_union" 1>&6
+	if test "$tcl_cv_cast_to_union" = "yes"; then
+	    cat >> confdefs.h <<\EOF
+#define HAVE_CAST_TO_UNION 1
+EOF
+
+	fi
+    fi
+
     # DL_LIBS is empty, but then we match the Unix version
     
     
@@ -1637,7 +1888,7 @@ EOF
 #--------------------------------------------------------------------
 
 echo $ac_n "checking how to run the C preprocessor""... $ac_c" 1>&6
-echo "configure:1641: checking how to run the C preprocessor" >&5
+echo "configure:1892: checking how to run the C preprocessor" >&5
 # On Suns, sometimes $CPP names a directory.
 if test -n "$CPP" && test -d "$CPP"; then
   CPP=
@@ -1652,13 +1903,13 @@ else
   # On the NeXT, cc -E runs the code through the compiler's parser,
   # not just through cpp.
   cat > conftest.$ac_ext <<EOF
-#line 1656 "configure"
+#line 1907 "configure"
 #include "confdefs.h"
 #include <assert.h>
 Syntax Error
 EOF
 ac_try="$ac_cpp conftest.$ac_ext >/dev/null 2>conftest.out"
-{ (eval echo configure:1662: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
+{ (eval echo configure:1913: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
 ac_err=`grep -v '^ *+' conftest.out | grep -v "^conftest.${ac_ext}\$"`
 if test -z "$ac_err"; then
   :
@@ -1669,13 +1920,13 @@ else
   rm -rf conftest*
   CPP="${CC-cc} -E -traditional-cpp"
   cat > conftest.$ac_ext <<EOF
-#line 1673 "configure"
+#line 1924 "configure"
 #include "confdefs.h"
 #include <assert.h>
 Syntax Error
 EOF
 ac_try="$ac_cpp conftest.$ac_ext >/dev/null 2>conftest.out"
-{ (eval echo configure:1679: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
+{ (eval echo configure:1930: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
 ac_err=`grep -v '^ *+' conftest.out | grep -v "^conftest.${ac_ext}\$"`
 if test -z "$ac_err"; then
   :
@@ -1686,13 +1937,13 @@ else
   rm -rf conftest*
   CPP="${CC-cc} -nologo -E"
   cat > conftest.$ac_ext <<EOF
-#line 1690 "configure"
+#line 1941 "configure"
 #include "confdefs.h"
 #include <assert.h>
 Syntax Error
 EOF
 ac_try="$ac_cpp conftest.$ac_ext >/dev/null 2>conftest.out"
-{ (eval echo configure:1696: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
+{ (eval echo configure:1947: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
 ac_err=`grep -v '^ *+' conftest.out | grep -v "^conftest.${ac_ext}\$"`
 if test -z "$ac_err"; then
   :
@@ -1718,17 +1969,17 @@ echo "$ac_t""$CPP" 1>&6
 
 ac_safe=`echo "errno.h" | sed 'y%./+-%__p_%'`
 echo $ac_n "checking for errno.h""... $ac_c" 1>&6
-echo "configure:1722: checking for errno.h" >&5
+echo "configure:1973: checking for errno.h" >&5
 if eval "test \"`echo '$''{'ac_cv_header_$ac_safe'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 1727 "configure"
+#line 1978 "configure"
 #include "confdefs.h"
 #include <errno.h>
 EOF
 ac_try="$ac_cpp conftest.$ac_ext >/dev/null 2>conftest.out"
-{ (eval echo configure:1732: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
+{ (eval echo configure:1983: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
 ac_err=`grep -v '^ *+' conftest.out | grep -v "^conftest.${ac_ext}\$"`
 if test -z "$ac_err"; then
   rm -rf conftest*
@@ -1758,20 +2009,20 @@ fi
 
 if test "${MACHINE}" = "X86" ; then
 echo $ac_n "checking availability of _strtoi64""... $ac_c" 1>&6
-echo "configure:1762: checking availability of _strtoi64" >&5
+echo "configure:2013: checking availability of _strtoi64" >&5
 if eval "test \"`echo '$''{'tcl_have_strtoi64'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   
     cat > conftest.$ac_ext <<EOF
-#line 1768 "configure"
+#line 2019 "configure"
 #include "confdefs.h"
 #include <stdlib.h>
 int main() {
 _strtoi64(0,0,0)
 ; return 0; }
 EOF
-if { (eval echo configure:1775: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:2026: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   tcl_have_strtoi64=yes
 else
@@ -1800,7 +2051,7 @@ fi
 
 
     echo $ac_n "checking for build with symbols""... $ac_c" 1>&6
-echo "configure:1804: checking for build with symbols" >&5
+echo "configure:2055: checking for build with symbols" >&5
     # Check whether --enable-symbols or --disable-symbols was given.
 if test "${enable_symbols+set}" = set; then
   enableval="$enable_symbols"
@@ -1861,7 +2112,7 @@ TK_DBGX=${DBGX}
 
 
     echo $ac_n "checking whether to embed manifest""... $ac_c" 1>&6
-echo "configure:1865: checking whether to embed manifest" >&5
+echo "configure:2116: checking whether to embed manifest" >&5
     # Check whether --enable-embedded-manifest or --disable-embedded-manifest was given.
 if test "${enable_embedded_manifest+set}" = set; then
   enableval="$enable_embedded_manifest"
@@ -1878,7 +2129,7 @@ fi
        -a "$GCC" != "yes" ; then
 	# Add the magic to embed the manifest into the dll/exe
 	cat > conftest.$ac_ext <<EOF
-#line 1882 "configure"
+#line 2133 "configure"
 #include "confdefs.h"
 
 #if defined(_MSC_VER) && _MSC_VER >= 1400
@@ -1915,7 +2166,7 @@ rm -f conftest*
 
 
     echo $ac_n "checking the location of tclConfig.sh""... $ac_c" 1>&6
-echo "configure:1919: checking the location of tclConfig.sh" >&5
+echo "configure:2170: checking the location of tclConfig.sh" >&5
 
     if test -d ../../tcl8.4$TK_PATCH_LEVEL/win;  then
 	TCL_BIN_DIR_DEFAULT=../../tcl8.4$TK_PATCH_LEVEL/win
@@ -1943,7 +2194,7 @@ fi
 
 
     echo $ac_n "checking for existence of $TCL_BIN_DIR/tclConfig.sh""... $ac_c" 1>&6
-echo "configure:1947: checking for existence of $TCL_BIN_DIR/tclConfig.sh" >&5
+echo "configure:2198: checking for existence of $TCL_BIN_DIR/tclConfig.sh" >&5
 
     if test -f "$TCL_BIN_DIR/tclConfig.sh" ; then
         echo "$ac_t""loading" 1>&6
@@ -1996,14 +2247,14 @@ echo "configure:1947: checking for existence of $TCL_BIN_DIR/tclConfig.sh" >&5
 
 
     echo $ac_n "checking for tclsh in Tcl build directory""... $ac_c" 1>&6
-echo "configure:2000: checking for tclsh in Tcl build directory" >&5
+echo "configure:2251: checking for tclsh in Tcl build directory" >&5
     BUILD_TCLSH=${TCL_BIN_DIR}/tclsh${TCL_MAJOR_VERSION}${TCL_MINOR_VERSION}${TCL_DBGX}${EXEEXT}
     echo "$ac_t""$BUILD_TCLSH" 1>&6
     
 
 
     echo $ac_n "checking for tclsh""... $ac_c" 1>&6
-echo "configure:2007: checking for tclsh" >&5
+echo "configure:2258: checking for tclsh" >&5
 
     if eval "test \"`echo '$''{'ac_cv_path_tclsh'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
diff --git a/win/configure.in b/win/configure.in
index ffad2c0..ff9e2cc 100644
--- a/win/configure.in
+++ b/win/configure.in
@@ -70,12 +70,6 @@ fi
 AC_PROG_MAKE_SET
 
 #--------------------------------------------------------------------
-# Perform additinal compiler tests.
-#--------------------------------------------------------------------
-
-AC_CYGWIN
-
-#--------------------------------------------------------------------
 # Determines the correct binary file extension (.o, .obj, .exe etc.)
 #--------------------------------------------------------------------
 
diff --git a/win/tcl.m4 b/win/tcl.m4
index 796ae5f..e06b1e0 100644
--- a/win/tcl.m4
+++ b/win/tcl.m4
@@ -408,6 +408,36 @@ AC_DEFUN([SC_CONFIG_CFLAGS], [
     # which requires x86|amd64|ia64.
     MACHINE="X86"
 
+    AC_CACHE_CHECK(for cross-compile version of gcc,
+	ac_cv_cross,
+	AC_TRY_COMPILE([
+	    #ifdef __WIN32__
+		#error cross-compiler
+	    #endif
+	], [],
+	ac_cv_cross=yes,
+	ac_cv_cross=no)
+    )
+
+    if test "$ac_cv_cross" = "yes"; then
+	case "$do64bit" in
+	    amd64|x64|yes)
+		CC="x86_64-w64-mingw32-gcc"
+		LD="x86_64-w64-mingw32-ld"
+		AR="x86_64-w64-mingw32-ar"
+		RANLIB="x86_64-w64-mingw32-ranlib"
+		RC="x86_64-w64-mingw32-windres"
+	    ;;
+	    *)
+		CC="i686-w64-mingw32-gcc"
+		LD="i686-w64-mingw32-ld"
+		AR="i686-w64-mingw32-ar"
+		RANLIB="i686-w64-mingw32-ranlib"
+		RC="i686-w64-mingw32-windres"
+	    ;;
+	esac
+    fi
+
     # Check for a bug in gcc's windres that causes the
     # compile to fail when a Windows native path is
     # passed into windres. The mingw toolchain requires
@@ -433,7 +463,7 @@ AC_DEFUN([SC_CONFIG_CFLAGS], [
 	cyg_conftest=
     fi
 
-    if test "$CYGPATH" = "echo" || test "$ac_cv_cygwin" = "yes"; then
+    if test "$CYGPATH" = "echo"; then
         DEPARG='"$<"'
     else
         DEPARG='"$(shell $(CYGPATH) $<)"'
@@ -441,6 +471,22 @@ AC_DEFUN([SC_CONFIG_CFLAGS], [
 
     # set various compiler flags depending on whether we are using gcc or cl
 
+    if test "${GCC}" = "yes" ; then
+	AC_CACHE_CHECK(for mingw32 version of gcc,
+	    ac_cv_win32,
+	    AC_TRY_COMPILE([
+		#ifdef __WIN32__
+		    #error win32
+		#endif
+	    ], [],
+	    ac_cv_win32=no,
+	    ac_cv_win32=yes)
+	)
+	if test "$ac_cv_win32" != "yes"; then
+	    AC_MSG_ERROR([${CC} cannot produce win32 executables.])
+	fi
+    fi
+
     AC_MSG_CHECKING([compiler flags])
     if test "${GCC}" = "yes" ; then
 	SHLIB_LD=""
@@ -461,25 +507,6 @@ AC_DEFUN([SC_CONFIG_CFLAGS], [
 	extra_cflags="-pipe"
 	extra_ldflags="-pipe"
 
-	if test "$ac_cv_cygwin" = "yes"; then
-	    case "$do64bit" in
-		amd64|x64|yes)
-		    CC="x86_64-w64-mingw32-gcc"
-		    LD="x86_64-w64-mingw32-ld"
-		    AR="x86_64-w64-mingw32-ar"
-		    RANLIB="x86_64-w64-mingw32-ranlib"
-		    RC="x86_64-w64-mingw32-windres"
-		;;
-		*)
-		    CC="i686-w64-mingw32-gcc"
-		    LD="i686-w64-mingw32-ld"
-		    AR="i686-w64-mingw32-ar"
-		    RANLIB="i686-w64-mingw32-ranlib"
-		    RC="i686-w64-mingw32-windres"
-	    ;;
-	    esac
-	fi
-
 	if test "${SHARED_BUILD}" = "0" ; then
 	    # static
             AC_MSG_RESULT([using static flags])
@@ -559,9 +586,9 @@ AC_DEFUN([SC_CONFIG_CFLAGS], [
 		;;
 	    *)
 		AC_TRY_COMPILE([
-			#ifdef _WIN64
+		    #ifdef _WIN64
 			#error 64-bit
-			#endif
+		    #endif
 		], [],
 			tcl_win_64bit=no,
 			tcl_win_64bit=yes
@@ -784,6 +811,101 @@ AC_DEFUN([SC_CONFIG_CFLAGS], [
 	fi
     fi
 
+    if test "${GCC}" = "yes" ; then
+	AC_CACHE_CHECK(for SEH support in compiler,
+	    tcl_cv_seh,
+	AC_TRY_RUN([
+	    #define WIN32_LEAN_AND_MEAN
+	    #include <windows.h>
+	    #undef WIN32_LEAN_AND_MEAN
+
+	    int main(int argc, char** argv) {
+		int a, b = 0;
+		__try {
+		    a = 666 / b;
+		}
+		__except (EXCEPTION_EXECUTE_HANDLER) {
+		    return 0;
+		}
+		return 1;
+	    }
+	],
+	    tcl_cv_seh=yes,
+	    tcl_cv_seh=no,
+	    tcl_cv_seh=no)
+	)
+	if test "$tcl_cv_seh" = "no" ; then
+	    AC_DEFINE(HAVE_NO_SEH, 1,
+		    [Defined when mingw does not support SEH])
+	fi
+
+	#
+	# Check to see if the excpt.h include file provided contains the
+	# definition for EXCEPTION_DISPOSITION; if not, which is the case
+	# with Cygwin's version as of 2002-04-10, define it to be int,
+	# sufficient for getting the current code to work.
+	#
+	AC_CACHE_CHECK(for EXCEPTION_DISPOSITION support in include files,
+	    tcl_cv_eh_disposition,
+	    AC_TRY_COMPILE([
+#	    define WIN32_LEAN_AND_MEAN
+#	    include <windows.h>
+#	    undef WIN32_LEAN_AND_MEAN
+	    ],[
+		EXCEPTION_DISPOSITION x;
+	    ],
+		tcl_cv_eh_disposition=yes,
+		tcl_cv_eh_disposition=no)
+	)
+	if test "$tcl_cv_eh_disposition" = "no" ; then
+	AC_DEFINE(EXCEPTION_DISPOSITION, int,
+		[Defined when cygwin/mingw does not support EXCEPTION DISPOSITION])
+	fi
+
+	# Check to see if winnt.h defines CHAR, SHORT, and LONG
+	# even if VOID has already been #defined. The win32api
+	# used by mingw and cygwin is known to do this.
+
+	AC_CACHE_CHECK(for winnt.h that ignores VOID define,
+	    tcl_cv_winnt_ignore_void,
+	    AC_TRY_COMPILE([
+		#define VOID void
+		#define WIN32_LEAN_AND_MEAN
+		#include <windows.h>
+		#undef WIN32_LEAN_AND_MEAN
+	    ], [
+		CHAR c;
+		SHORT s;
+		LONG l;
+	    ],
+        tcl_cv_winnt_ignore_void=yes,
+        tcl_cv_winnt_ignore_void=no)
+	)
+	if test "$tcl_cv_winnt_ignore_void" = "yes" ; then
+	    AC_DEFINE(HAVE_WINNT_IGNORE_VOID, 1,
+		    [Defined when cygwin/mingw ignores VOID define in winnt.h])
+	fi
+
+	# See if the compiler supports casting to a union type.
+	# This is used to stop gcc from printing a compiler
+	# warning when initializing a union member.
+
+	AC_CACHE_CHECK(for cast to union support,
+	    tcl_cv_cast_to_union,
+	    AC_TRY_COMPILE([],
+	    [
+		  union foo { int i; double d; };
+		  union foo f = (union foo) (int) 0;
+	    ],
+	    tcl_cv_cast_to_union=yes,
+	    tcl_cv_cast_to_union=no)
+	)
+	if test "$tcl_cv_cast_to_union" = "yes"; then
+	    AC_DEFINE(HAVE_CAST_TO_UNION, 1,
+		    [Defined when compiler supports casting to union type.])
+	fi
+    fi
+
     # DL_LIBS is empty, but then we match the Unix version
     AC_SUBST(DL_LIBS)
     AC_SUBST(CFLAGS_DEBUG)