Use __sparc__ rather than sparc.

src/ChangeLog

+2008-08-10  Glenn Morris  <rgm@gnu.org>
+
+	Sync from trunk 2008-07-08:
+	* m/sparc.h: Define __sparc__ rather than sparc.  (Bug#507.)
+	* alloc.c, ecrt0.c: Use __sparc__ rather than sparc.
+
+	* unexsunos4.c: Use __sparc__ rather than sparc.
+
 2008-08-08  Chong Yidong  <cyd@stupidchicken.com>
 
 	* xdisp.c (move_it_to): When stopping at a charpos, check if

src/alloc.c

@@ -4572,7 +4572,7 @@ mark_stack ()
   /* Fixme: Code in the Boehm GC suggests flushing (with `flushrs') is
      needed on ia64 too.  See mach_dep.c, where it also says inline
      assembler doesn't work with relevant proprietary compilers.  */
-#ifdef sparc
+#ifdef __sparc__
   asm ("ta 3");
 #endif
 

src/ecrt0.c

@@ -582,7 +582,7 @@ _start()
 #endif /* elxsi */
 
 
-#ifdef sparc
+#ifdef __sparc__
 asm (".global __start");
 asm (".text");
 asm ("__start:");
@@ -600,7 +600,7 @@ asm ("	sub	%sp, 24, %sp");
 asm ("	call	__exit");
 asm ("	nop");
 
-#endif /* sparc */
+#endif /* __sparc__ */
 
 #if __FreeBSD__ == 2
 char *__progname;

src/m/sparc.h

@@ -38,10 +38,10 @@ NOTE-END  */
 
 #define NO_ARG_ARRAY
 
-/* Say this machine is a sparc */
+/* Say this machine is a sparc.  Probably already defined.  */
 
-#ifndef sparc
-#define sparc
+#ifndef __sparc__
+#define __sparc__
 #endif
 
 /* Use type int rather than a union, to represent Lisp_Object */

src/unexsunos4.c

@@ -236,11 +236,11 @@ unexec (new_name, a_name, bndry, bss_start, entry)
 #else /* not SUNOS4_SHARED_LIBRARIES */
     rel = erel = 0;
 #endif /* not SUNOS4_SHARED_LIBRARIES */
-#ifdef sparc
+#ifdef __sparc__
 #define REL_INFO_TYPE		struct reloc_info_sparc
 #else
 #define REL_INFO_TYPE		struct relocation_info
-#endif /* sparc */
+#endif /* __sparc__ */
 #define REL_TARGET_ADDRESS(r)	(((REL_INFO_TYPE *)(r))->r_address)
 #endif /* SUNOS4 */
 #if defined (__FreeBSD__) || defined (__NetBSD__)