Fixing issue with non-verbose error message for GCC

There was an issue when compiling with GCC_ARM, the tools would
print the incorrect file where the error was present. This modifies the
regular expression and matching logic used to find the error. This was
tested with the 4.9 q2 release of GCC ARM.

tools/toolchains/gcc.py

@@ -28,7 +28,7 @@ class GCC(mbedToolchain):
 
     STD_LIB_NAME = "lib%s.a"
     CIRCULAR_DEPENDENCIES = True
-    DIAGNOSTIC_PATTERN = re.compile('((?P<line>\d+):)(\d+:)? (?P<severity>warning|error): (?P<message>.+)')
+    DIAGNOSTIC_PATTERN = re.compile('((?P<file>[^:]+):(?P<line>\d+):)(\d+:)? (?P<severity>warning|error): (?P<message>.+)')
 
     def __init__(self, target, options=None, notify=None, macros=None, silent=False, tool_path="", extra_verbose=False):
         mbedToolchain.__init__(self, target, options, notify, macros, silent, extra_verbose=extra_verbose)
@@ -138,27 +138,16 @@ class GCC(mbedToolchain):
                 )
                 continue
 
-            # Each line should start with the file information: "filepath: ..."
-            # i should point past the file path                          ^
-            # avoid the first column in Windows (C:\)
-            i = line.find(':', 2)
-            if i == -1: continue
-
-            if state == WHERE:
-                file = line[:i]
-                message = line[i+1:].strip() + ' '
-                state = WHAT
-
-            elif state == WHAT:
-                match = GCC.DIAGNOSTIC_PATTERN.match(line[i+1:])
-                if match is None:
-                    state = WHERE
-                    continue
 
+            match = GCC.DIAGNOSTIC_PATTERN.match(line)
+            if match is not None:
                 self.cc_info(
-                    match.group('severity'),
-                    file, match.group('line'),
-                    message + match.group('message')
+                    match.group('severity').lower(),
+                    match.group('file'),
+                    match.group('line'),
+                    match.group('message'),
+                    target_name=self.target.name,
+                    toolchain_name=self.name
                 )
 
     def get_dep_option(self, object):