[PATCH 8/12] arm: Introduce multilibs for PACBTI target feature

[Andrea Corallo via Gcc-patches]

This patch add the following new multilibs.

thumb/v8.1-m.main+pacbti/mbranch-protection/nofp
thumb/v8.1-m.main+pacbti+dp/mbranch-protection/soft
thumb/v8.1-m.main+pacbti+dp/mbranch-protection/hard
thumb/v8.1-m.main+pacbti+fp/mbranch-protection/soft
thumb/v8.1-m.main+pacbti+fp/mbranch-protection/hard
thumb/v8.1-m.main+pacbti+mve/mbranch-protection/hard

Triggering the following compiler flags:

-mthumb -march=armv8.1-m.main+pacbti -mbranch-protection=standard 
-mfloat-abi=soft
-mthumb -march=armv8.1-m.main+pacbti+fp -mbranch-protection=standard 
-mfloat-abi=softfp
-mthumb -march=armv8.1-m.main+pacbti+fp -mbranch-protection=standard 
-mfloat-abi=hard
-mthumb -march=armv8.1-m.main+pacbti+fp.dp -mbranch-protection=standard 
-mfloat-abi=softfp
-mthumb -march=armv8.1-m.main+pacbti+fp.dp -mbranch-protection=standard 
-mfloat-abi=hard
-mthumb -march=armv8.1-m.main+pacbti+mve -mbranch-protection=standard 
-mfloat-abi=hard

gcc/ChangeLog:

        * config/arm/t-rmprofile: Add multilib rules for +pacbti.


diff --git a/gcc/config/arm/t-rmprofile b/gcc/config/arm/t-rmprofile
index eb321e832f1..542ff874b2e 100644
--- a/gcc/config/arm/t-rmprofile
+++ b/gcc/config/arm/t-rmprofile
@@ -27,8 +27,11 @@
 
 # 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/march=armv8.1-m.main+mve
-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 v8.1-m.main+mve
+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/march=armv8.1-m.main+mve/march=armv8.1-m.main+pacbti/march=armv8.1-m.main+pacbti+fp/march=armv8.1-m.main+pacbti+fp.dp/march=armv8.1-m.main+pacbti+mve
+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 v8.1-m.main+mve v8.1-m.main+pacbti 
v8.1-m.main+pacbti+fp v8.1-m.main+pacbti+dp 8.1-m.main+pacbti+mve
+
+MULTI_ARCH_OPTS_RM     += mbranch-protection=pac-ret+bti
+MULTI_ARCH_DIRS_RM     += mbranch-protection
 
 # Base M-profile (no fp)
 MULTILIB_REQUIRED      += mthumb/march=armv6s-m/mfloat-abi=soft
@@ -50,6 +53,14 @@ MULTILIB_REQUIRED    += 
mthumb/march=armv8-m.main+fp.dp/mfloat-abi=hard
 MULTILIB_REQUIRED      += mthumb/march=armv8-m.main+fp.dp/mfloat-abi=softfp
 MULTILIB_REQUIRED      += mthumb/march=armv8.1-m.main+mve/mfloat-abi=hard
 
+MULTILIB_REQUIRED      += 
mthumb/march=armv8.1-m.main+pacbti/mbranch-protection=standard/mfloat-abi=soft
+MULTILIB_REQUIRED      += 
mthumb/march=armv8.1-m.main+pacbti+fp/mbranch-protection=standard/mfloat-abi=softfp
+MULTILIB_REQUIRED      += 
mthumb/march=armv8.1-m.main+pacbti+fp/mbranch-protection=standard/mfloat-abi=hard
+MULTILIB_REQUIRED      += 
mthumb/march=armv8.1-m.main+pacbti+fp.dp/mbranch-protection=standard/mfloat-abi=softfp
+MULTILIB_REQUIRED      += 
mthumb/march=armv8.1-m.main+pacbti+fp.dp/mbranch-protection=standard/mfloat-abi=hard
+MULTILIB_REQUIRED      += 
mthumb/march=armv8.1-m.main+pacbti+mve/mbranch-protection=standard/mfloat-abi=hard
+
+
 # Arch Matches
 MULTILIB_MATCHES       += march?armv6s-m=march?armv6-m
 
@@ -93,3 +104,4 @@ MULTILIB_MATCHES     += 
march?armv8-m.main=mlibarch?armv8-m.main
 MULTILIB_MATCHES       += march?armv8-m.main+fp=mlibarch?armv8-m.main+fp
 MULTILIB_MATCHES       += march?armv8-m.main+fp.dp=mlibarch?armv8-m.main+fp.dp
 MULTILIB_MATCHES       += march?armv8.1-m.main+mve=mlibarch?armv8.1-m.main+mve
+MULTILIB_MATCHES       += 
march?armv8.1-m.main+pacbti=mlibarch?armv8.1-m.main+pacbti