tsystem.h (alloca): Provide a default definition.

	* tsystem.h (alloca): Provide a default definition.

	Revert:
	2001-08-31  Kaveh R. Ghazi  <ghazi@caip.rutgers.edu>
	    * unwind-dw2.c: Call __builtin_alloca, not alloca.

From-SVN: r87775

gcc/ChangeLog

+2004-09-20  Kaveh R. Ghazi  <ghazi@caip.rutgers.edu>
+
+	* tsystem.h (alloca): Provide a default definition.
+
+	Revert:
+	2001-08-31  Kaveh R. Ghazi  <ghazi@caip.rutgers.edu>
+	    * unwind-dw2.c: Call __builtin_alloca, not alloca.
+
 2004-09-20  Andrew Pinski  <pinskia@physics.uc.edu>
 
 	PR tree-opt/17558

gcc/tsystem.h

@@ -117,4 +117,8 @@ extern int errno;
 #define NULL 0
 #endif
 
+/* GCC always provides __builtin_alloca(x).  */
+#undef alloca
+#define alloca(x) __builtin_alloca(x)
+
 #endif /* ! GCC_TSYSTEM_H */

gcc/unwind-dw2.c

@@ -840,7 +840,7 @@ execute_cfa_program (const unsigned char *insn_ptr,
 		unused_rs = unused_rs->prev;
 	      }
 	    else
-	      new_rs = __builtin_alloca (sizeof (struct frame_state_reg_info));
+	      new_rs = alloca (sizeof (struct frame_state_reg_info));
 
 	    *new_rs = fs->regs;
 	    fs->regs.prev = new_rs;