Use mapping of core->arch ver. for tc picking

tools/build_api.py

@@ -44,7 +44,7 @@ from .paths import (MBED_CMSIS_PATH, MBED_TARGETS_PATH, MBED_LIBRARIES,
                     BUILD_DIR)
 from .resources import Resources, FileType, FileRef
 from .notifier.mock import MockNotifier
-from .targets import TARGET_NAMES, TARGET_MAP
+from .targets import TARGET_NAMES, TARGET_MAP, CORE_ARCH
 from .libraries import Library
 from .toolchains import TOOLCHAIN_CLASSES
 from .config import Config
@@ -316,9 +316,7 @@ def prepare_toolchain(src_paths, build_dir, target, toolchain_name,
         raise NotSupportedException(
             "Target {} is not supported by toolchain {}".format(
                 target.name, toolchain_name))
-    if (toolchain_name == "ARM" and
-        target.core in ("Cortex-M23", "Cortex-M23-NS",
-                        "Cortex-M33", "Cortex-M33-NS")):
+    if (toolchain_name == "ARM" and CORE_ARCH[target.core] == 8):
         toolchain_name = "ARMC6"
 
     try:

tools/targets/__init__.py

@@ -30,7 +30,7 @@ from tools.paths import TOOLS_BOOTLOADERS
 from tools.utils import json_file_to_dict
 
 __all__ = ["target", "TARGETS", "TARGET_MAP", "TARGET_NAMES", "CORE_LABELS",
-           "HookError", "generate_py_target", "Target",
+           "CORE_ARCH", "HookError", "generate_py_target", "Target",
            "CUMULATIVE_ATTRIBUTES", "get_resolution_order"]
 
 CORE_LABELS = {
@@ -50,6 +50,23 @@ CORE_LABELS = {
     "Cortex-M33-NS": ["M33", "M33_NS", "CORTEX_M", "LIKE_CORTEX_M33", "CORTEX"]
 }
 
+CORE_ARCH = {
+    "Cortex-M0": 6,
+    "Cortex-M0+": 6,
+    "Cortex-M1": 6,
+    "Cortex-M3": 7,
+    "Cortex-M4": 7,
+    "Cortex-M4F": 7,
+    "Cortex-M7": 7,
+    "Cortex-M7F": 7,
+    "Cortex-M7FD": 7,
+    "Cortex-A9": 7,
+    "Cortex-M23": 8,
+    "Cortex-M23-NS": 8,
+    "Cortex-M33": 8,
+    "Cortex-M33-NS": 8,
+}
+
 ################################################################################
 # Generic Target class that reads and interprets the data in targets.json