Update clang version requirements

Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>

include/mbedtls/mbedtls_config.h

@@ -2258,9 +2258,10 @@
  *          system, Armv8-A Cryptographic Extensions must be supported by
  *          the CPU when this option is enabled.
  *
- * \note    Minimum compiler versions for this feature are Clang 4.0;
- *          armclang 6.6 when targeting aarch64, or 6.20 when targeting
- *          Thumb or 32-bit Arm; GCC 6.0; or MSVC 2019 version 16.11.2.
+ * \note    Minimum compiler versions for this feature when targeting aarch64
+ *          are Clang 4.0; armclang 6.6; GCC 6.0; or MSVC 2019 version 16.11.2.
+ *          Minimum compiler versions for this feature when targeting 32-bit
+ *          Arm or Thumb are Clang 11.0; armclang 6.20; or GCC 6.0.
  *
  * \note \c CFLAGS must be set to a minimum of \c -march=armv8-a+crypto for
  * armclang <= 6.9

library/aesce.c

@@ -61,8 +61,10 @@
 
 /* Compiler version checks. */
 #if defined(__clang__)
-#   if __clang_major__ < 4
-#       error "Minimum version of Clang for MBEDTLS_AESCE_C is 4.0."
+#   if defined(MBEDTLS_ARCH_IS_ARM32) && (__clang_major__ < 11)
+#       error "Minimum version of Clang for MBEDTLS_AESCE_C on 32-bit Arm or Thumb is 111.0."
+#   elif defined(MBEDTLS_ARCH_IS_ARM64) && (__clang_major__ < 4)
+#       error "Minimum version of Clang for MBEDTLS_AESCE_C on aarch64 is 4.0."
 #   endif
 #elif defined(__GNUC__)
 #   if __GNUC__ < 6

tests/scripts/all.sh

@@ -4394,7 +4394,7 @@ component_build_aes_aesce_armcc () {
 support_build_aes_armce() {
     # clang >= 4 is required to build with AES extensions
     ver="$(clang --version|grep version|sed -E 's#.*version ([0-9]+).*#\1#')"
-    [ "${ver}" -ge 4 ]
+    [ "${ver}" -ge 11 ]
 }
 
 component_build_aes_armce () {