[RTEMS] Add multilibs for LEON3FT back-to-back store workaround

Replace MULTILIB_EXCEPTIONS with MULTILIB_REQUIRED for readability.
-mfix-gr712rc and -mfix-ut700 are currently equivalent.

gcc/
	* config/sparc/t-rtems: Add mfix-gr712rc multilibs. Replace
	MULTILIB_EXCEPTIONS with MULTILIB_REQUIRED. Match -mfix-gr712rc
	with -mfix-ut700.

From-SVN: r250252

gcc/ChangeLog

+2017-07-17  Daniel Cederman  <cederman@gaisler.com>
+
+	* config/sparc/t-rtems: Add mfix-gr712rc multilibs. Replace
+	MULTILIB_EXCEPTIONS with MULTILIB_REQUIRED. Match -mfix-gr712rc
+	with -mfix-ut700.
+
 2017-07-16  Eric Botcazou  <ebotcazou@adacore.com>
 
 	PR rtl-optimization/81424

gcc/config/sparc/t-rtems

@@ -18,19 +18,25 @@
 #
 
 MULTILIB_OPTIONS = msoft-float mcpu=v8/mcpu=leon3/mcpu=leon3v7/mcpu=leon \
-		   mfix-ut699/mfix-at697f
-MULTILIB_DIRNAMES = soft v8 leon3 leon3v7 leon ut699 at697f
-MULTILIB_MATCHES = msoft-float=mno-fpu
+		   mfix-ut699/mfix-at697f/mfix-gr712rc
+MULTILIB_DIRNAMES = soft v8 leon3 leon3v7 leon ut699 at697f gr712rc
+MULTILIB_MATCHES = msoft-float=mno-fpu mfix-gr712rc=mfix-ut700
 
-MULTILIB_EXCEPTIONS = mfix-ut699
-MULTILIB_EXCEPTIONS += msoft-float/mfix-ut699
-MULTILIB_EXCEPTIONS += msoft-float/mcpu=v8/mfix-ut699
-MULTILIB_EXCEPTIONS += msoft-float/mcpu=leon3*/mfix-ut699
-MULTILIB_EXCEPTIONS += mcpu=v8/mfix-ut699
-MULTILIB_EXCEPTIONS += mcpu=leon3*/mfix-ut699
-MULTILIB_EXCEPTIONS += mfix-at697f
-MULTILIB_EXCEPTIONS += msoft-float/mfix-at697f
-MULTILIB_EXCEPTIONS += msoft-float/mcpu=v8/mfix-at697f
-MULTILIB_EXCEPTIONS += msoft-float/mcpu=leon3*/mfix-at697f
-MULTILIB_EXCEPTIONS += mcpu=v8/mfix-at697f
-MULTILIB_EXCEPTIONS += mcpu=leon3*/mfix-at697f
+MULTILIB_REQUIRED =
+MULTILIB_REQUIRED += msoft-float
+MULTILIB_REQUIRED += mcpu=v8
+MULTILIB_REQUIRED += mcpu=leon3
+MULTILIB_REQUIRED += mcpu=leon3v7
+MULTILIB_REQUIRED += mcpu=leon
+MULTILIB_REQUIRED += mcpu=leon3/mfix-gr712rc
+MULTILIB_REQUIRED += mcpu=leon3v7/mfix-gr712rc
+MULTILIB_REQUIRED += mcpu=leon/mfix-ut699
+MULTILIB_REQUIRED += mcpu=leon/mfix-at697f
+MULTILIB_REQUIRED += msoft-float/mcpu=v8
+MULTILIB_REQUIRED += msoft-float/mcpu=leon3
+MULTILIB_REQUIRED += msoft-float/mcpu=leon3v7
+MULTILIB_REQUIRED += msoft-float/mcpu=leon
+MULTILIB_REQUIRED += msoft-float/mcpu=leon3/mfix-gr712rc
+MULTILIB_REQUIRED += msoft-float/mcpu=leon3v7/mfix-gr712rc
+MULTILIB_REQUIRED += msoft-float/mcpu=leon/mfix-ut699
+MULTILIB_REQUIRED += msoft-float/mcpu=leon/mfix-at697f