Allow command-line filtering of toolchains

tools/test/examples/examples.py

@@ -1,5 +1,6 @@
 """ import and bulid a bunch of example programs """
 
+from argparse import ArgumentParser
 import os
 from os.path import dirname, abspath, basename
 import os.path
@@ -12,13 +13,14 @@ sys.path.insert(0, ROOT)
 
 from tools.build_api import get_mbed_official_release
 from tools.targets import TARGET_MAP
+from tools.utils import argparse_force_uppercase_type
 
 
 EXAMPLES = json.load(open(os.path.join(os.path.dirname(__file__),
                                        "examples.json")))
 
 def print_stuff(name, lst):
-    if list:
+    if lst:
         print("#"*80)
         print("# {} example combinations".format(name))
         print("#")
@@ -26,28 +28,53 @@ def print_stuff(name, lst):
         print(thing)
 
 
+SUPPORTED_TOOLCHAINS = ["ARM", "IAR", "GCC_ARM"]
+
+
+def target_cross_toolchain(required_features, allowed_toolchains):
+    """Generate pairs of target and toolchains
+
+    Args:
+    required_features - the features that must be in the features array of a
+                        target
+    allowed_toolchains - a list of all possible toolchains
+    """
+    for target, toolchains in get_mbed_official_release("5"):
+        for toolchain in toolchains:
+            if (toolchain in allowed_toolchains and
+                all(feature in TARGET_MAP[target].features
+                    for feature in required_features)):
+                yield target, toolchain
+
+
+
 def main():
     """Entry point"""
+    parser = ArgumentParser()
+    parser.add_argument(
+        "toolchains", nargs="*", default=SUPPORTED_TOOLCHAINS,
+        type=argparse_force_uppercase_type(SUPPORTED_TOOLCHAINS,
+                                           "toolchain"))
+    args = parser.parse_args()
+
     failures = []
     sucesses = []
     for example, build_features in EXAMPLES.iteritems():
         subprocess.call(["mbed-cli", "import", example])
         os.chdir(basename(example))
-        for target, toolchains in [(target, toolchains) for target, toolchains
-                                   in get_mbed_official_release("5") if
-                                   all(feature in TARGET_MAP[target].features
-                                       for feature in build_features)]:
-            for toolchain in toolchains:
-                proc = subprocess.Popen(["mbed-cli", "compile", "-t",
-                                         toolchain, "-m", target])
-                proc.wait()
-                example_name = "{} {} {}".format(basename(example), target,
-                                                 toolchain)
-                if proc.returncode:
-                    failures.append(example_name)
-                else:
-                    sucesses.append(example_name)
+        for target, toolchain in target_cross_toolchain(build_features,
+                                                        args.toolchains):
+            proc = subprocess.Popen(["mbed-cli", "compile", "-t",
+                                     toolchain, "-m", target])
+            proc.wait()
+            example_name = "{} {} {}".format(basename(example), target,
+                                             toolchain)
+            if proc.returncode:
+                failures.append(example_name)
+            else:
+                sucesses.append(example_name)
         os.chdir("..")
+
     print_stuff("Passed", sucesses)
     print_stuff("Failed", failures)
     return len(failures)