system.h (CONST_CAST): Avoid union for gcc-4.0.x.

* system.h (CONST_CAST): Avoid union for gcc-4.0.x. From-SVN: r127878

system.h (CONST_CAST): Avoid union for gcc-4.0.x.
* system.h (CONST_CAST): Avoid union for gcc-4.0.x. From-SVN: r127878
0b51511b · Kaveh R. Ghazi · Kaveh Ghazi · 5d75fb81 · 0b51511b · 0b51511b
Commit 0b51511b authored Aug 29, 2007 by Kaveh R. Ghazi Committed by Kaveh Ghazi Aug 29, 2007
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gcc/ChangeLog
+4 -0

gcc/system.h
+3 -1

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--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
+2007-08-28  Kaveh R. Ghazi  <ghazi@caip.rutgers.edu>
+
+	* system.h (CONST_CAST): Avoid union for gcc-4.0.x.
+
 2007-08-28  Richard Guenther  <rguenther@suse.de>

 	* tree.h (struct tree_function_decl): Increase size of

--- a/gcc/system.h
+++ b/gcc/system.h
@@ -774,7 +774,9 @@ extern void fancy_abort (const char *, int, const char *) ATTRIBUTE_NORETURN;
   execv, et al.  Another valid use would be in an allocation function
   that creates const objects that need to be initialized.  Most other
   cases should be viewed with extreme caution.  */
-#ifdef __GNUC__
+
+#if defined(__GNUC__) && GCC_VERSION != 4000
+/* GCC 4.0.x has a bug where it may ICE on this expression.  */
 #define CONST_CAST(X) ((__extension__(union {__typeof(X)_q; void *_v;})(X))._v)
 #else
 #define CONST_CAST(X) ((void*)(X))