Allow users to set armcc and iccarm in path.

Raise exceptin instead of exit.
Corrected error for arm-none-eabi-gcc/g++ set in path.

tools/toolchains/__init__.py

@@ -198,9 +198,9 @@ def check_toolchain_path(function):
     """
     def perform_check(self, *args, **kwargs):
         if not exists(self.toolchain_path):
-            print('[ERROR] Toolchain path for %s does not exist.\n'
-                  'Current value: %s' % (self.name, self.toolchain_path))
-            sys.exit(-1)
+            error_string = 'Could not find executable for %s.\n Currently ' \
+                           'set search path: %s'% (self.name, self.toolchain_path)
+            raise Exception(error_string)
         return function(self, *args, **kwargs)
     return perform_check
 

tools/toolchains/arm.py

@@ -15,12 +15,12 @@ See the License for the specific language governing permissions and
 limitations under the License.
 """
 import re
-from os.path import join, dirname, splitext, basename, exists
+from os.path import join, dirname, splitext, basename
+from distutils.spawn import find_executable
 
 from tools.toolchains import mbedToolchain, TOOLCHAIN_PATHS
 from tools.hooks import hook_tool
 from tools.utils import mkdir
-import copy
 
 class ARM(mbedToolchain):
     LINKER_EXT = '.sct'
@@ -56,6 +56,11 @@ class ARM(mbedToolchain):
         else:
             cpu = target.core
 
+        if not TOOLCHAIN_PATHS['ARM']:
+            exe = find_executable('armcc')
+            if exe:
+                TOOLCHAIN_PATHS['ARM'] = dirname(dirname(exe))
+
         ARM_BIN = join(TOOLCHAIN_PATHS['ARM'], "bin")
         ARM_INC = join(TOOLCHAIN_PATHS['ARM'], "include")
         

tools/toolchains/gcc.py

@@ -16,6 +16,7 @@ limitations under the License.
 """
 import re
 from os.path import join, basename, splitext, dirname, exists
+from distutils.spawn import find_executable
 
 from tools.toolchains import mbedToolchain, TOOLCHAIN_PATHS
 from tools.hooks import hook_tool
@@ -110,7 +111,10 @@ class GCC(mbedToolchain):
         self.ar = join(tool_path, "arm-none-eabi-ar")
         self.elf2bin = join(tool_path, "arm-none-eabi-objcopy")
 
-        self.toolchain_path = tool_path
+        if tool_path:
+            self.toolchain_path = main_cc
+        else:
+            self.toolchain_path = find_executable("arm-none-eabi-gcc") or ''
 
     def parse_dependencies(self, dep_path):
         dependencies = []

tools/toolchains/iar.py

@@ -17,6 +17,7 @@ limitations under the License.
 import re
 from os import remove
 from os.path import join, exists, dirname, splitext, exists
+from distutils.spawn import find_executable
 
 from tools.toolchains import mbedToolchain, TOOLCHAIN_PATHS
 from tools.hooks import hook_tool
@@ -50,6 +51,12 @@ class IAR(mbedToolchain):
             cpuchoice = "Cortex-M7"
         else:
             cpuchoice = target.core
+
+        if not TOOLCHAIN_PATHS['IAR']:
+            exe =  find_executable('iccarm')
+            if exe:
+                TOOLCHAIN_PATHS['IAR'] = dirname(dirname(exe))
+
         # flags_cmd are used only by our scripts, the project files have them already defined,
         # using this flags results in the errors (duplication)
         # asm accepts --cpu Core or --fpu FPU, not like c/c++ --cpu=Core