alias.c: Include output.h.

	* alias.c: Include output.h.
	(DIFFERENT_ALIAS_SETS_P): Don't treat alias sets as
	different if we're in a varargs function.
	* Makefile.in (alias.o): Depend on output.h

From-SVN: r21967

gcc/ChangeLog

+Tue Aug 25 12:02:23 1998  Mark Mitchell  <mark@markmitchell.com>
+
+	* alias.c: Include output.h.
+	(DIFFERENT_ALIAS_SETS_P): Don't treat alias sets as
+	different if we're in a varargs function.
+	* Makefile.in (alias.o): Depend on output.h
+	
 Tue Aug 25 19:20:12 1998  J"orn Rennecke <amylaar@cygnus.co.uk>
 
 	* sh.h (GIV_SORT_CRITERION): Delete.
@@ -49,6 +56,7 @@ Mon Aug 24 15:20:19 1998  David Edelsohn  <edelsohn@mhpcc.edu>
 	(movdf_softfloat32, movdf_hardfloat64, movdf_softfloat64): Change
 	'o' to 'm' for GPR variant constraints.
 
+>>>>>>> 1.1938
 Mon Aug 24 10:25:46 1998  Jeffrey A Law  (law@cygnus.com)
 
         * loop.c (scan_loop): Honor AVOID_CC_MODE_COPIES.

gcc/Makefile.in

@@ -1480,7 +1480,7 @@ reorg.o : reorg.c $(CONFIG_H) system.h $(RTL_H) conditions.h hard-reg-set.h \
    $(BASIC_BLOCK_H) $(REGS_H) insn-config.h insn-attr.h \
    insn-flags.h $(RECOG_H) flags.h output.h $(EXPR_H)
 alias.o : alias.c $(CONFIG_H) system.h $(RTL_H) flags.h hard-reg-set.h \
-   $(REGS_H) toplev.h $(EXPR_H)
+   $(REGS_H) toplev.h output.h $(EXPR_H) 
 regmove.o : regmove.c $(CONFIG_H) system.h $(RTL_H) insn-config.h \
    $(RECOG_H) output.h reload.h $(REGS_H) hard-reg-set.h flags.h \
    $(EXPR_H) insn-flags.h $(BASIC_BLOCK_H) toplev.h

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.