* gcc.dg/dll-?.c Add thumb to target list.

[pf3gnuchains/gcc-fork.git] / gcc / alias.c

diff --git a/gcc/alias.c b/gcc/alias.c
index 8e0d21b..7c6c75f 100644 (file)
--- a/gcc/alias.c
+++ b/gcc/alias.c
@@ -26,6 +26,7 @@ Boston, MA 02111-1307, USA.  */
 #include "regs.h"
 #include "hard-reg-set.h"
 #include "flags.h"
+#include "output.h"
 #include "toplev.h"
 
 static rtx canon_rtx                   PROTO((rtx));
@@ -58,11 +59,14 @@ static rtx find_base_value          PROTO((rtx));
 #endif
 
 /* Returns nonzero if MEM1 and MEM2 do not alias because they are in
-   different alias sets.  */
-#define DIFFERENT_ALIAS_SETS_P(MEM1, MEM2)             \
-  (CHECK_ALIAS_SETS_FOR_CONSISTENCY(MEM1, MEM2),       \
-   MEM_ALIAS_SET (MEM1) && MEM_ALIAS_SET (MEM2)                \
-   && MEM_ALIAS_SET (MEM1) != MEM_ALIAS_SET (MEM2))
+   different alias sets.  We ignore alias sets in functions making use
+   of variable arguments because the va_arg macros on some systems are
+   not legal ANSI C.  */
+#define DIFFERENT_ALIAS_SETS_P(MEM1, MEM2)                     \
+  (CHECK_ALIAS_SETS_FOR_CONSISTENCY(MEM1, MEM2),               \
+   MEM_ALIAS_SET (MEM1) && MEM_ALIAS_SET (MEM2)                        \
+   && MEM_ALIAS_SET (MEM1) != MEM_ALIAS_SET (MEM2)             \
+   && !current_function_stdarg && !current_function_varargs)
 
 /* Cap the number of passes we make over the insns propagating alias
    information through set chains.