arm.c (output_func_epilogue): Check TARGET_ABORT_NORETURN before generating a…

arm.c (output_func_epilogue): Check TARGET_ABORT_NORETURN before generating a call to abort for volatile...

        * config/arm.c (output_func_epilogue):  Check TARGET_ABORT_NORETURN
        before generating a call to abort for volatile functions.
        * config/arm.h (ARM_FLAG_ABORT_NORETURN):  Define.
        (TARGET_ABORT_NORETURN):  Define.
        (abort-on-noreturn):  New option.

From-SVN: r24653

gcc/ChangeLog

+Wed Jan 13 16:16:44 1999  Catherine Moore  <clm@cygnus.com>
+
+        * config/arm.c (output_func_epilogue):  Check TARGET_ABORT_NORETURN
+        before generating a call to abort for volatile functions.
+        * config/arm.h (ARM_FLAG_ABORT_NORETURN):  Define.
+        (TARGET_ABORT_NORETURN):  Define.
+        (abort-on-noreturn):  New option.
+
 Wed Jan 13 13:30:08 1999  Kaveh R. Ghazi  <ghazi@caip.rutgers.edu>
 
 	* cccp.c (xstrdup): Renamed from `savestring'.  All callers changed.

gcc/config/arm/arm.c

@@ -5006,7 +5006,7 @@ output_func_epilogue (f, frame_size)
     goto epilogue_done;
 
   /* A volatile function should never return.  Call abort.  */
-  if (volatile_func)
+  if (TARGET_ABORT_NORETURN && volatile_func)
     {
       rtx op = gen_rtx (SYMBOL_REF, Pmode, "abort");
       assemble_external_libcall (op);

gcc/config/arm/arm.h

@@ -312,6 +312,10 @@ extern char *target_fp_name;
    big-endian (for backwards compatibility with older versions of GCC).  */
 #define ARM_FLAG_LITTLE_WORDS	(0x2000)
 
+/* Nonzero if a call to abort should be generated if a noreturn 
+function tries to return. */
+#define ARM_FLAG_ABORT_NORETURN (0x8000)
+
 #define TARGET_APCS			(target_flags & ARM_FLAG_APCS_FRAME)
 #define TARGET_POKE_FUNCTION_NAME	(target_flags & ARM_FLAG_POKE)
 #define TARGET_FPE			(target_flags & ARM_FLAG_FPE)
@@ -327,6 +331,7 @@ extern char *target_fp_name;
 #define TARGET_BIG_END			(target_flags & ARM_FLAG_BIG_END)
 #define TARGET_THUMB_INTERWORK		(target_flags & ARM_FLAG_THUMB)
 #define TARGET_LITTLE_WORDS		(target_flags & ARM_FLAG_LITTLE_WORDS)
+#define TARGET_ABORT_NORETURN           (target_flags & ARM_FLAG_ABORT_NORETURN)
 
 /* SUBTARGET_SWITCHES is used to add flags on a per-config basis.
    Bit 31 is reserved.  See riscix.h.  */
@@ -377,6 +382,10 @@ extern char *target_fp_name;
   {"thumb-interwork",		ARM_FLAG_THUMB, 	\
      "Support calls between THUMB and ARM instructions sets" },	\
   {"no-thumb-interwork",       -ARM_FLAG_THUMB, "" },	\
+  {"abort-on-noreturn",         ARM_FLAG_ABORT_NORETURN,     \
+   "Generate a call to abort if a noreturn function returns"}, \
+  {"no-abort-on-noreturn",      -ARM_FLAG_ABORT_NORETURN, ""}, \
+
   SUBTARGET_SWITCHES					\
   {"",				TARGET_DEFAULT }	\
 }