[AArch64] fix big.LITTLE spec rewriting

gcc/

	* common/config/aarch64/aarch64-common.c
	(aarch64_rewrite_mcpu): Handle multiple names.
	* config/aarch64/aarch64.h
	(BIG_LITTLE_SPEC): Do not discard mcpu switches.

From-SVN: r207053

gcc/ChangeLog

+2014-01-24  James Greenhalgh  <james.greenhalgh@arm.com>
+
+	* common/config/aarch64/aarch64-common.c
+	(aarch64_rewrite_mcpu): Handle multiple names.
+	* config/aarch64/aarch64.h
+	(BIG_LITTLE_SPEC): Do not discard mcpu switches.
+
 2014-01-24  Dodji Seketeli  <dodji@redhat.com>
 
 	* input.c (add_file_to_cache_tab): Handle the case where fopen

gcc/common/config/aarch64/aarch64-common.c

@@ -110,13 +110,15 @@ aarch64_rewrite_selected_cpu (const char *name)
 
 /* Called by the driver to rewrite a name passed to the -mcpu
    argument in preparation to be passed to the assembler.  The
-   name will be in ARGV[0], ARGC should always be 1.  */
+   names passed from the commend line will be in ARGV, we want
+   to use the right-most argument, which should be in
+   ARGV[ARGC - 1].  ARGC should always be greater than 0.  */
 
 const char *
 aarch64_rewrite_mcpu (int argc, const char **argv)
 {
-  gcc_assert (argc == 1);
-  return aarch64_rewrite_selected_cpu (argv[0]);
+  gcc_assert (argc);
+  return aarch64_rewrite_selected_cpu (argv[argc - 1]);
 }
 
 #undef AARCH64_CPU_NAME_LENGTH

gcc/config/aarch64/aarch64.h

@@ -857,7 +857,7 @@ extern enum aarch64_code_model aarch64_cmodel;
   (BYTES_BIG_ENDIAN ? GET_MODE_NUNITS (mode) - 1 - n : n)
 
 #define BIG_LITTLE_SPEC \
-   " %{mcpu=*:%<mcpu=* -mcpu=%:rewrite_mcpu(%{mcpu=*:%*})}"
+   " %{mcpu=*:-mcpu=%:rewrite_mcpu(%{mcpu=*:%*})}"
 
 extern const char *aarch64_rewrite_mcpu (int argc, const char **argv);
 #define BIG_LITTLE_CPU_SPEC_FUNCTIONS \