Fix Linux multilib configurations with default architectures

gcc/

	* config/mips/mips.h (MIPS_ISA_LEVEL_SPEC): Only infer an ISA
	level from an ARCH; do not inject the default.
	(MIPS_DEFAULT_ISA_LEVEL_SPEC): New macro split out from
	MIPS_ISA_LEVEL_SPEC.
	(MIPS_ISA_NAN2008_SPEC): Update comment.
	(BASE_DRIVER_SELF_SPECS): Likewise.
	* config/mips/elfoabi.h (DRIVER_SELF_SPECS): Add
	MIPS_DEFAULT_ISA_LEVEL_SPEC.
	* config/mips/mti-elf.h (DRIVER_SELF_SPECS): Likewise.
	* config/mips/mti-linux.h (DRIVER_SELF_SPECS): Likewise.
	* config/mips/sde.h (DRIVER_SELF_SPECS): Likewise.

From-SVN: r219580

gcc/ChangeLog

+2015-01-14  Matthew Fortune  <matthew.fortune@imgtec.com>
+
+    	* config/mips/mips.h (MIPS_ISA_LEVEL_SPEC): Only infer an ISA
+    	level from an ARCH; do not inject the default.
+    	(MIPS_DEFAULT_ISA_LEVEL_SPEC): New macro split out from
+    	MIPS_ISA_LEVEL_SPEC.
+    	(MIPS_ISA_NAN2008_SPEC): Update comment.
+    	(BASE_DRIVER_SELF_SPECS): Likewise.
+    	* config/mips/elfoabi.h (DRIVER_SELF_SPECS): Add
+    	MIPS_DEFAULT_ISA_LEVEL_SPEC.
+    	* config/mips/mti-elf.h (DRIVER_SELF_SPECS): Likewise.
+    	* config/mips/mti-linux.h (DRIVER_SELF_SPECS): Likewise.
+    	* config/mips/sde.h (DRIVER_SELF_SPECS): Likewise.
+
 2015-01-14  Richard Biener  <rguenther@suse.de>
 
 	PR tree-optimization/64493

gcc/config/mips/elfoabi.h

@@ -20,6 +20,9 @@ along with GCC; see the file COPYING3.  If not see
 
 #undef DRIVER_SELF_SPECS
 #define DRIVER_SELF_SPECS						\
+  /* Set the ISA for the default multilib.  */				\
+  MIPS_DEFAULT_ISA_LEVEL_SPEC,						\
+									\
   /* Make sure a -mips option is present.  This helps us to pick	\
      the right multilib, and also makes the later specs easier		\
      to write.  */							\

gcc/config/mips/mips.h

@@ -704,8 +704,7 @@ struct mips_cpu_info {
 #define MIPS_ARCH_OPTION_SPEC \
   MIPS_ISA_LEVEL_OPTION_SPEC "|march=*"
 
-/* A spec that infers a -mips argument from an -march argument,
-   or injects the default if no architecture is specified.  */
+/* A spec that infers a -mips argument from an -march argument.  */
 
 #define MIPS_ISA_LEVEL_SPEC \
   "%{" MIPS_ISA_LEVEL_OPTION_SPEC ":;: \
@@ -725,7 +724,13 @@ struct mips_cpu_info {
      %{march=mips64r2|march=loongson3a|march=octeon|march=xlp: -mips64r2} \
      %{march=mips64r3: -mips64r3} \
      %{march=mips64r5: -mips64r5} \
-     %{march=mips64r6: -mips64r6} \
+     %{march=mips64r6: -mips64r6}}"
+
+/* A spec that injects the default multilib ISA if no architecture is
+   specified.  */
+
+#define MIPS_DEFAULT_ISA_LEVEL_SPEC \
+  "%{" MIPS_ISA_LEVEL_OPTION_SPEC ":;: \
      %{!march=*: -" MULTILIB_ISA_DEFAULT "}}"
 
 /* A spec that infers a -mhard-float or -msoft-float setting from an
@@ -757,6 +762,7 @@ struct mips_cpu_info {
   "%{msynci|mno-synci:;:%{mips32r2|mips32r3|mips32r5|mips32r6|mips64r2 \
 			  |mips64r3|mips64r5|mips64r6:-msynci;:-mno-synci}}"
 
+/* Infer a -mnan=2008 setting from a -mips argument.  */
 #define MIPS_ISA_NAN2008_SPEC \
   "%{mnan*:;mips32r6|mips64r6:-mnan=2008}"
 
@@ -806,7 +812,9 @@ struct mips_cpu_info {
   {"mips-plt", "%{!mplt:%{!mno-plt:-m%(VALUE)}}" }, \
   {"synci", "%{!msynci:%{!mno-synci:-m%(VALUE)}}" }
 
-/* A spec that infers the -mdsp setting from an -march argument.  */
+/* A spec that infers the:
+   -mnan=2008 setting from a -mips argument,
+   -mdsp setting from a -march argument.  */
 #define BASE_DRIVER_SELF_SPECS \
   MIPS_ISA_NAN2008_SPEC,       \
   "%{!mno-dsp: \

gcc/config/mips/mti-elf.h

@@ -19,6 +19,9 @@ along with GCC; see the file COPYING3.  If not see
 
 #undef DRIVER_SELF_SPECS
 #define DRIVER_SELF_SPECS						\
+  /* Set the ISA for the default multilib.  */				\
+  MIPS_DEFAULT_ISA_LEVEL_SPEC,						\
+									\
   /* Make sure a -mips option is present.  This helps us to pick	\
      the right multilib, and also makes the later specs easier		\
      to write.  */							\

gcc/config/mips/mti-linux.h

@@ -31,6 +31,9 @@ along with GCC; see the file COPYING3.  If not see
 
 #undef DRIVER_SELF_SPECS
 #define DRIVER_SELF_SPECS						\
+  /* Set the ISA for the default multilib.  */				\
+  MIPS_DEFAULT_ISA_LEVEL_SPEC,						\
+									\
   /* Make sure a -mips option is present.  This helps us to pick	\
      the right multilib, and also makes the later specs easier		\
      to write.  */							\

gcc/config/mips/sde.h

@@ -20,6 +20,9 @@ along with GCC; see the file COPYING3.  If not see
 
 #undef DRIVER_SELF_SPECS
 #define DRIVER_SELF_SPECS						\
+  /* Set the ISA for the default multilib.  */				\
+  MIPS_DEFAULT_ISA_LEVEL_SPEC,						\
+									\
   /* Make sure a -mips option is present.  This helps us to pick	\
      the right multilib, and also makes the later specs easier		\
      to write.  */							\