* win/configure: Regen.

	* win/configure.in:
	* win/tclWin32Dll.c (TclpCheckStackSpace): Rework
	the SEH exception handler logic to avoid using
	the stack since alloca will modify the stack.
	This was causing a nasty bug that would set the
	exception handler to 0 because it tried to pop
	the previous exception handler off the top of
	the stack.

1 files changed, 24 insertions, 1 deletions

diff --git a/win/configure.in b/win/configure.in
index b641255..0b99959 100644
--- a/win/configure.in
+++ b/win/configure.in
@@ -3,7 +3,7 @@
 # generate the file "configure", which is run during Tcl installation
 # to configure the system for the local environment.
 #
-# RCS: @(#) $Id: configure.in,v 1.62 2003/01/13 07:01:06 mdejong Exp $
+# RCS: @(#) $Id: configure.in,v 1.63 2003/01/24 08:04:28 mdejong Exp $
 
 AC_INIT(../generic/tcl.h)
 AC_PREREQ(2.13)
@@ -194,6 +194,29 @@ if test "$tcl_cv_winnt_ignore_void" = "yes" ; then
             [Defined when cygwin/mingw ignores VOID define in winnt.h])
 fi
 
+# Check to see if malloc.h is missing the alloca function
+# declaration. This is known to be a problem with Mingw.
+
+AC_CACHE_CHECK(for alloca declaration in malloc.h,
+    tcl_cv_malloc_decl_alloca,
+AC_TRY_COMPILE([
+#include <malloc.h>
+],
+[
+  size_t arg = 0;
+  void* ptr;
+  ptr = alloca;
+  ptr = alloca(arg);
+],
+        tcl_cv_malloc_decl_alloca=yes,
+        tcl_cv_malloc_decl_alloca=no)
+)
+if test "$tcl_cv_malloc_decl_alloca" = "no" ; then
+    AC_DEFINE(HAVE_NO_ALLOC_DECL, 1,
+            [Defined when alloca decl is missing from malloc.h])
+fi
+
+
 #--------------------------------------------------------------------
 # Determines the correct binary file extension (.o, .obj, .exe etc.)
 #--------------------------------------------------------------------