Explicitely test for intrinsics support in compiler, before assuming only MSVC has it.

1 files changed, 24 insertions, 1 deletions

diff --git a/win/configure.in b/win/configure.in
index 3ffe9f2..50f5de4 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 1.127 2010/12/10 15:44:53 nijtmans Exp $
+# RCS: @(#) $Id: configure.in,v 1.128 2010/12/20 10:28:47 nijtmans Exp $
 
 AC_INIT(../generic/tcl.h)
 AC_PREREQ(2.59)
@@ -272,6 +272,29 @@ if test "$tcl_cv_mwmo_alertable" = "no"; then
             [Defined when MWMO_ALERTABLE is missing from winuser.h])
 fi
 
+# See if the compiler supports intrinsics.
+
+AC_CACHE_CHECK(for intrinsics support in compiler,
+    tcl_cv_intrinsics,
+AC_TRY_COMPILE([
+#define WIN32_LEAN_AND_MEAN
+#include <windows.h>
+#undef WIN32_LEAN_AND_MEAN
+#include <intrin.h>
+],
+[
+  unsigned int regs[4];
+  __cpuid(&regs,0);
+  __debugbreak();
+],
+        tcl_cv_intrinsics=yes,
+        tcl_cv_intrinsics=no)
+)
+if test "$tcl_cv_intrinsics" = "yes"; then
+    AC_DEFINE(HAVE_INTRIN_H, 1,
+            [Defined when the compilers supports intrinsics])
+fi
+
 #--------------------------------------------------------------------
 # Determines the correct binary file extension (.o, .obj, .exe etc.)
 #--------------------------------------------------------------------