msp430.h (LIB_SPEC): Add -lcrt

* config/msp430/msp430.h (LIB_SPEC): Add -lcrt
* config/msp430/msp430.md (msp430_refsym_need_exit): New.
* config/msp430/msp430.c (msp430_expand_epilogue): Call it
whenever main() has an epilogue.

From-SVN: r207334

gcc/ChangeLog

+2014-01-30  DJ Delorie  <dj@redhat.com>
+
+	* config/msp430/msp430.h (LIB_SPEC): Add -lcrt
+	* config/msp430/msp430.md (msp430_refsym_need_exit): New.
+	* config/msp430/msp430.c (msp430_expand_epilogue): Call it
+	whenever main() has an epilogue.
+
 2014-01-30  Bill Schmidt  <wschmidt@linux.vnet.ibm.com>
 
 	* config/rs6000/rs6000.c (rs6000_expand_vector_init): Remove

gcc/config/msp430/msp430.c

@@ -1429,6 +1429,9 @@ msp430_expand_epilogue (int is_eh)
 
   emit_insn (gen_epilogue_start_marker ());
 
+  if (cfun->decl && strcmp (IDENTIFIER_POINTER (DECL_NAME (cfun->decl)), "main") == 0)
+    emit_insn (gen_msp430_refsym_need_exit ());
+
   if (is_wakeup_func ())
     /* Clear the SCG1, SCG0, OSCOFF and CPUOFF bits in the saved copy of the
        status register current residing on the stack.  When this function

gcc/config/msp430/msp430.h

@@ -68,6 +68,7 @@ extern bool msp430x;
 --start-group						\
 -lc							\
 -lgcc							\
+-lcrt							\
 %{msim:-lsim}						\
 %{!msim:-lnosys}					\
 --end-group					   	\

gcc/config/msp430/msp430.md

@@ -45,6 +45,8 @@
    UNS_POP_INTR
    UNS_BIC_SR
    UNS_BIS_SR
+
+   UNS_REFSYM_NEED_EXIT
   ])
   
 (include "predicates.md")
@@ -938,6 +940,14 @@
   "; start of epilogue"
   )
 
+;; This makes the linker add a call to exit() after the call to main()
+;; in crt0
+(define_insn "msp430_refsym_need_exit"
+  [(unspec_volatile [(const_int 0)] UNS_REFSYM_NEED_EXIT)]
+  ""
+  ".refsym\t__crt0_call_exit"
+  )
+
 ;;------------------------------------------------------------
 ;; Jumps