[RTEMS] Change multilibs for ARM

Account for Cortex-M3 Errata 602117.  The -mfix-cortex-m3-ldrd option is
enabled by default, if -mcpu=cortex-m3 is used.

gcc/

	* config/arm/t-rtems: Replace ARMv7-M multilibs with Cortex-M
	multilibs.

From-SVN: r271280

gcc/ChangeLog

+2019-05-16  Sebastian Huber  <sebastian.huber@embedded-brains.de>
+
+	* config/arm/t-rtems: Replace ARMv7-M multilibs with Cortex-M
+	multilibs.
+
 2019-05-16  Richard Biener  <rguenther@suse.de>
 
 	PR tree-optimization/90424

gcc/config/arm/t-rtems

@@ -17,8 +17,8 @@ MULTILIB_DIRNAMES	+= eb
 MULTILIB_OPTIONS	+= mthumb
 MULTILIB_DIRNAMES	+= thumb
 
-MULTILIB_OPTIONS	+= march=armv5te+fp/march=armv6-m/march=armv7-a/march=armv7-a+simd/march=armv7-r/march=armv7-r+fp/march=armv7-m/march=armv7e-m+fp/march=armv7e-m+fp.dp
-MULTILIB_DIRNAMES	+= armv5te+fp       armv6-m       armv7-a       armv7-a+simd       armv7-r       armv7-r+fp       armv7-m       armv7e-m+fp        armv7e-m+fp.dp
+MULTILIB_OPTIONS	+= march=armv5te+fp/march=armv6-m/march=armv7-a/march=armv7-a+simd/march=armv7-r/march=armv7-r+fp/mcpu=cortex-m3/mcpu=cortex-m4/mcpu=cortex-m4+nofp/mcpu=cortex-m7
+MULTILIB_DIRNAMES	+= armv5te+fp       armv6-m       armv7-a       armv7-a+simd       armv7-r       armv7-r+fp       cortex-m3      cortex-m4      cortex-m4+nofp      cortex-m7
 
 MULTILIB_OPTIONS	+= mfloat-abi=hard
 MULTILIB_DIRNAMES	+= hard
@@ -31,7 +31,8 @@ MULTILIB_REQUIRED	+= mthumb/march=armv7-a+simd/mfloat-abi=hard
 MULTILIB_REQUIRED	+= mthumb/march=armv7-a
 MULTILIB_REQUIRED	+= mthumb/march=armv7-r+fp/mfloat-abi=hard
 MULTILIB_REQUIRED	+= mthumb/march=armv7-r
-MULTILIB_REQUIRED	+= mthumb/march=armv7e-m+fp/mfloat-abi=hard
-MULTILIB_REQUIRED	+= mthumb/march=armv7e-m+fp.dp/mfloat-abi=hard
-MULTILIB_REQUIRED	+= mthumb/march=armv7-m
+MULTILIB_REQUIRED	+= mthumb/mcpu=cortex-m3
+MULTILIB_REQUIRED	+= mthumb/mcpu=cortex-m4/mfloat-abi=hard
+MULTILIB_REQUIRED	+= mthumb/mcpu=cortex-m4+nofp
+MULTILIB_REQUIRED	+= mthumb/mcpu=cortex-m7/mfloat-abi=hard
 MULTILIB_REQUIRED	+= mthumb