msp430.opt (-minrt): New.

* config/msp430/msp430.opt (-minrt): New.
* config/msp430/msp430.h (STARTFILE_SPEC): Link alternate runtime
if -minrt given.
(ENDFILE_SPEC): Likewise.

From-SVN: r207294

gcc/ChangeLog

+2014-01-29  DJ Delorie  <dj@redhat.com>
+
+	* config/msp430/msp430.opt (-minrt): New.
+	* config/msp430/msp430.h (STARTFILE_SPEC): Link alternate runtime
+	if -minrt given.
+	(ENDFILE_SPEC): Likewise.
+
 2014-01-29  Jan Hubicka  <jh@suse.cz>
 
 	* ipa-inline-analysis.c (clobber_only_eh_bb_p): New function.

gcc/config/msp430/msp430.h

@@ -45,11 +45,11 @@ extern bool msp430x;
   while (0)
 
 #undef  STARTFILE_SPEC
-#define STARTFILE_SPEC "%{pg:gcrt0.o%s}%{!pg:crt0.o%s} crtbegin.o%s"
+#define STARTFILE_SPEC "%{pg:gcrt0.o%s}%{!pg:%{minrt:crt0-minrt.o%s}%{!minrt:crt0.o%s}} %{!minrt:crtbegin.o%s}"
 
 /* -lgcc is included because crtend.o needs __mspabi_func_epilog_1.  */
 #undef  ENDFILE_SPEC
-#define ENDFILE_SPEC "crtend.o%s crtn.o%s -lgcc"
+#define ENDFILE_SPEC "%{!minrt:crtend.o%s} %{minrt:crtn-minrt.o%s}%{!minrt:crtn.o%s} -lgcc"
 
 #define ASM_SPEC "-mP " /* Enable polymorphic instructions.  */ \
   "%{mcpu=*:-mcpu=%*}%{!mcpu=*:%{mmcu=*:-mmcu=%*}} " /* Pass the CPU type on to the assembler.  */ \

gcc/config/msp430/msp430.opt

@@ -28,3 +28,7 @@ Optimize opcode sizes at link time
 
 mOs
 Target Undocumented Mask(OPT_SPACE)
+
+minrt
+Target Report Mask(MINRT) RejectNegative
+Use a minimum runtime (no static initializers or ctors) for memory-constrained devices.