Update default compilers in compiler_c and compiler_cxx

to include the clang tools

waflib/Configure.py

@@ -493,7 +493,7 @@ def find_program(self, filename, **kw):
 
 	exts = kw.get('exts', Utils.is_win32 and '.exe,.com,.bat,.cmd' or ',.sh,.pl,.py')
 
-	environ = kw.get('environ', os.environ)
+	environ = kw.get('environ', self.environ)
 
 	ret = ''
 	filename = Utils.to_list(filename)

waflib/Tools/compiler_c.py

@@ -35,17 +35,17 @@ from waflib import Utils, Configure
 from waflib.Logs import debug
 
 c_compiler = {
-'win32':  ['msvc', 'gcc'],
+'win32':  ['msvc', 'gcc', 'clang'],
 'cygwin': ['gcc'],
-'darwin': ['gcc'],
-'aix':    ['xlc', 'gcc'],
-'linux':  ['gcc', 'icc'],
+'darwin': ['clang', 'gcc'],
+'aix':    ['xlc', 'gcc', 'clang'],
+'linux':  ['gcc', 'clang', 'icc'],
 'sunos':  ['suncc', 'gcc'],
 'irix':   ['gcc', 'irixcc'],
 'hpux':   ['gcc'],
-'gnu':    ['gcc'],
-'java':   ['gcc', 'msvc', 'icc'],
-'default':['gcc'],
+'gnu':    ['gcc', 'clang'],
+'java':   ['gcc', 'msvc', 'clang', 'icc'],
+'default':['gcc', 'clang'],
 }
 """
 Dict mapping the platform names to Waf tools finding specific C compilers::

waflib/Tools/compiler_cxx.py

@@ -36,17 +36,17 @@ from waflib import Utils, Configure
 from waflib.Logs import debug
 
 cxx_compiler = {
-'win32':  ['msvc', 'g++'],
+'win32':  ['msvc', 'g++', 'clang++'],
 'cygwin': ['g++'],
-'darwin': ['g++'],
-'aix':    ['xlc++', 'g++'],
-'linux':  ['g++', 'icpc'],
+'darwin': ['clang++', 'g++'],
+'aix':    ['xlc++', 'g++', 'clang++'],
+'linux':  ['g++', 'clang++', 'icpc'],
 'sunos':  ['sunc++', 'g++'],
 'irix':   ['g++'],
 'hpux':   ['g++'],
-'gnu':    ['g++'],
-'java':   ['g++', 'msvc', 'icpc'],
-'default': ['g++']
+'gnu':    ['g++', 'clang++'],
+'java':   ['g++', 'msvc', 'clang++', 'icpc'],
+'default': ['g++', 'clang++']
 }
 """
 Dict mapping the platform names to Waf tools finding specific C++ compilers::