This patch shows how to change a gcc profile to remove a target architecture

remove-armv8.patch

remove armv8 from starlight multilib    
    
---    
    
--- a/gcc/config/arm/t-rmprofile    
+++ b/gcc/config/arm/t-rmprofile    
@@ -27,15 +27,13 @@    
    
 # Arch and FPU variants to build libraries with    
    
-MULTI_ARCH_OPTS_RM     = march=armv6s-m/march=armv7-m/march=armv7e-m/march=armv7e-m+fp/march=armv7e-m+fp.dp/march=armv8-m.base/march=armv8-m.main/march=armv8-m.main+fp/march=armv8-m.main+fp.dp    
-MULTI_ARCH_DIRS_RM     = v6-m v7-m v7e-m v7e-m+fp v7e-m+dp v8-m.base v8-m.main v8-m.main+fp v8-m.main+dp    
+MULTI_ARCH_OPTS_RM     = march=armv6s-m/march=armv7-m/march=armv7e-m/march=armv7e-m+fp/march=armv7e-m+fp.dp    
+MULTI_ARCH_DIRS_RM     = v6-m v7-m v7e-m v7e-m+fp v7e-m+dp    
    
 # Base M-profile (no fp)    
 MULTILIB_REQUIRED      += mthumb/march=armv6s-m/mfloat-abi=soft    
 MULTILIB_REQUIRED      += mthumb/march=armv7-m/mfloat-abi=soft    
 MULTILIB_REQUIRED      += mthumb/march=armv7e-m/mfloat-abi=soft    
-MULTILIB_REQUIRED      += mthumb/march=armv8-m.base/mfloat-abi=soft    
-MULTILIB_REQUIRED      += mthumb/march=armv8-m.main/mfloat-abi=soft    
    
 # ARMv7e-M with FP (single and double precision variants)    
 MULTILIB_REQUIRED      += mthumb/march=armv7e-m+fp/mfloat-abi=hard    
@@ -43,26 +41,13 @@    
 MULTILIB_REQUIRED      += mthumb/march=armv7e-m+fp.dp/mfloat-abi=hard    
 MULTILIB_REQUIRED      += mthumb/march=armv7e-m+fp.dp/mfloat-abi=softfp    
    
-# ARMv8-M with FP (single and double precision variants)    
-MULTILIB_REQUIRED      += mthumb/march=armv8-m.main+fp/mfloat-abi=hard    
-MULTILIB_REQUIRED      += mthumb/march=armv8-m.main+fp/mfloat-abi=softfp    
-MULTILIB_REQUIRED      += mthumb/march=armv8-m.main+fp.dp/mfloat-abi=hard    
-MULTILIB_REQUIRED      += mthumb/march=armv8-m.main+fp.dp/mfloat-abi=softfp    
-    
-    
-    
 # Arch Matches    
 MULTILIB_MATCHES       += march?armv6s-m=march?armv6-m    
    
-# Map all v8-m.main+dsp FP variants down the the variant without DSP.    
-MULTILIB_MATCHES       += march?armv8-m.main=march?armv8-m.main+dsp \    
-                          $(foreach FP, +fp +fp.dp, \    
-                            march?armv8-m.main$(FP)=march?armv8-m.main+dsp$(FP))    
-    
 # For single-precision only fpv5, use the base fp libraries    
 MULTILIB_MATCHES       += march?armv7e-m+fp=march?armv7e-m+fpv5    
    
 # Softfp but no FP.  Use the soft-float libraries.    
-MULTILIB_REUSE         += $(foreach ARCH, armv6s-m armv7-m armv7e-m armv8-m\.base armv8-m\.main, \    
+MULTILIB_REUSE         += $(foreach ARCH, armv6s-m armv7-m armv7e-m, \    
                             mthumb/march.$(ARCH)/mfloat-abi.soft=mthumb/march.$(ARCH)/mfloat-abi.softfp)    
~
~