Added encoding to version check for Py3 compat

Author: Cruz Monrreal II

tools/toolchains/arm.py

@@ -102,7 +102,7 @@ def version_check(self):
         stdout, _, retcode = run_cmd([self.cc[0], "--vsn"], redirect=True)
         msg = None
         min_ver, max_ver = self.ARMCC_RANGE
-        match = self.ARMCC_VERSION_RE.search(stdout)
+        match = self.ARMCC_VERSION_RE.search(stdout.encode("utf-8"))
         found_version = LooseVersion(match.group(1).decode("utf-8")) if match else None
         min_ver, max_ver = self.ARMCC_RANGE
         if found_version and (found_version < min_ver or found_version >= max_ver):

tools/toolchains/gcc.py

@@ -133,7 +133,7 @@ def __init__(self, target,  notify=None, macros=None, build_profile=None,
     def version_check(self):
         stdout, _, retcode = run_cmd([self.cc[0], "--version"], redirect=True)
         msg = None
-        match = self.GCC_VERSION_RE.search(stdout)
+        match = self.GCC_VERSION_RE.search(stdout.encode("utf-8"))
         found_version = LooseVersion(match.group(0).decode('utf-8')) if match else None
         min_ver, max_ver = self.GCC_RANGE
         if found_version and (found_version < min_ver or found_version >= max_ver):

tools/toolchains/iar.py

@@ -99,7 +99,7 @@ def __init__(self, target, notify=None, macros=None, build_profile=None,
     def version_check(self):
         stdout, _, retcode = run_cmd([self.cc[0], "--version"], redirect=True)
         msg = None
-        match = self.IAR_VERSION_RE.search(stdout)
+        match = self.IAR_VERSION_RE.search(stdout.encode("utf-8"))
         found_version = match.group(1).decode("utf-8") if match else None
         if found_version and LooseVersion(found_version) != self.IAR_VERSION:
             msg = "Compiler version mismatch: Have {}; expected {}".format(