This patch allows profiles input in '--with-arch'.  With this change,
profile names such as `rva22*`, `rvb23*`, or `rvi*` can be passed
directly to `--with-arch` without triggering configure errors.  This
makes it easier to configure and build a toolchain targeting RISC-V
profiles, since the input can match the profile name directly instead
of requiring manual mapping to base ISA strings.

gcc/ChangeLog:

        * config.gcc: Accept RISC-V profiles in `--with-arch`.
        * config/riscv/arch-canonicalize: Add profile detection and
        skip canonicalization for profiles.

---
 gcc/config.gcc                     | 6 ++++--
 gcc/config/riscv/arch-canonicalize | 8 +++++++-
 2 files changed, 11 insertions(+), 3 deletions(-)

diff --git a/gcc/config.gcc b/gcc/config.gcc
index 04e88cce00d..a209c64958b 100644
--- a/gcc/config.gcc
+++ b/gcc/config.gcc
@@ -4775,7 +4775,8 @@ case "${target}" in
 
                # Infer arch from --with-arch, --target, and --with-abi.
                case "${with_arch}" in
-               rv32e* | rv32i* | rv32g* | rv64e* | rv64i* | rv64g*)
+               rv32e* | rv32i* | rv32g* | rv64e* | rv64i* | rv64g* \
+               | rvi* | rva* | rvb*)
                        # OK.
                        ;;
                "")
@@ -4829,7 +4830,8 @@ case "${target}" in
                | ilp32d,rv32*d* | ilp32d,rv32g* \
                | lp64,rv64* | lp64e,rv64e* \
                | lp64f,rv64*f* | lp64f,rv64g* \
-               | lp64d,rv64*d* | lp64d,rv64g*)
+               | lp64d,rv64*d* | lp64d,rv64g* \
+               | lp64d,rvi* | lp64d,rva* | lp64d,rvb*)
                        ;;
                *)
                        echo "--with-abi=${with_abi} is not supported for ISA 
${with_arch}" 1>&2
diff --git a/gcc/config/riscv/arch-canonicalize 
b/gcc/config/riscv/arch-canonicalize
index 15a398502b3..76951261452 100755
--- a/gcc/config/riscv/arch-canonicalize
+++ b/gcc/config/riscv/arch-canonicalize
@@ -341,6 +341,9 @@ def get_all_extensions():
 #
 IMPLIED_EXT = parse_def_files()
 
+def is_profile_arch(arch):
+    return arch.startswith(("rva", "rvb", "rvi"))
+
 def arch_canonicalize(arch, isa_spec):
   # TODO: Support extension version.
   is_isa_spec_2p2 = isa_spec == '2.2'
@@ -608,7 +611,10 @@ if __name__ == "__main__":
     sys.exit(run_unit_tests())
   elif args.arch_strs:
     for arch in args.arch_strs:
-      print (arch_canonicalize(arch, args.misa_spec))
+        if is_profile_arch(arch):
+            print(arch)
+        else:
+            print(arch_canonicalize(arch, args.misa_spec))
   else:
     parser.print_help()
     sys.exit(1)
-- 
2.43.0

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