Squashed 'waflib/' content from commit 391d285

git-subtree-dir: waflib
git-subtree-split: 391d2853c6c97efc90e466f187675e8155c866d6

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diff --git a/Tools/compiler_c.py b/Tools/compiler_c.py
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+#!/usr/bin/env python
+# encoding: utf-8
+# Matthias Jahn jahn dôt matthias ât freenet dôt de, 2007 (pmarat)
+
+"""
+Try to detect a C compiler from the list of supported compilers (gcc, msvc, etc)::
+
+	def options(opt):
+		opt.load('compiler_c')
+	def configure(cnf):
+		cnf.load('compiler_c')
+	def build(bld):
+		bld.program(source='main.c', target='app')
+
+The compilers are associated to platforms in :py:attr:`waflib.Tools.compiler_c.c_compiler`. To register
+a new C compiler named *cfoo* (assuming the tool ``waflib/extras/cfoo.py`` exists), use::
+
+	from waflib.Tools.compiler_c import c_compiler
+	c_compiler['win32'] = ['cfoo', 'msvc', 'gcc']
+
+	def options(opt):
+		opt.load('compiler_c')
+	def configure(cnf):
+		cnf.load('compiler_c')
+	def build(bld):
+		bld.program(source='main.c', target='app')
+
+Not all compilers need to have a specific tool. For example, the clang compilers can be detected by the gcc tools when using::
+
+	$ CC=clang waf configure
+"""
+
+import re
+from waflib.Tools import ccroot
+from waflib import Utils
+from waflib.Logs import debug
+
+c_compiler = {
+'win32':  ['msvc', 'gcc', 'clang'],
+'cygwin': ['gcc'],
+'darwin': ['clang', 'gcc'],
+'aix':    ['xlc', 'gcc', 'clang'],
+'linux':  ['gcc', 'clang', 'icc'],
+'sunos':  ['suncc', 'gcc'],
+'irix':   ['gcc', 'irixcc'],
+'hpux':   ['gcc'],
+'osf1V':  ['gcc'],
+'gnu':    ['gcc', 'clang'],
+'java':   ['gcc', 'msvc', 'clang', 'icc'],
+'default':['clang', 'gcc'],
+}
+"""
+Dict mapping platform names to Waf tools finding specific C compilers::
+
+	from waflib.Tools.compiler_c import c_compiler
+	c_compiler['linux'] = ['gcc', 'icc', 'suncc']
+"""
+
+def default_compilers():
+	build_platform = Utils.unversioned_sys_platform()
+	possible_compiler_list = c_compiler.get(build_platform, c_compiler['default'])
+	return ' '.join(possible_compiler_list)
+
+def configure(conf):
+	"""
+	Detects a suitable C compiler
+
+	:raises: :py:class:`waflib.Errors.ConfigurationError` when no suitable compiler is found
+	"""
+	try:
+		test_for_compiler = conf.options.check_c_compiler or default_compilers()
+	except AttributeError:
+		conf.fatal("Add options(opt): opt.load('compiler_c')")
+
+	for compiler in re.split('[ ,]+', test_for_compiler):
+		conf.env.stash()
+		conf.start_msg('Checking for %r (C compiler)' % compiler)
+		try:
+			conf.load(compiler)
+		except conf.errors.ConfigurationError as e:
+			conf.env.revert()
+			conf.end_msg(False)
+			debug('compiler_c: %r', e)
+		else:
+			if conf.env.CC:
+				conf.end_msg(conf.env.get_flat('CC'))
+				conf.env.COMPILER_CC = compiler
+				conf.env.commit()
+				break
+			conf.env.revert()
+			conf.end_msg(False)
+	else:
+		conf.fatal('could not configure a C compiler!')
+
+def options(opt):
+	"""
+	This is how to provide compiler preferences on the command-line::
+
+		$ waf configure --check-c-compiler=gcc
+	"""
+	test_for_compiler = default_compilers()
+	opt.load_special_tools('c_*.py', ban=['c_dumbpreproc.py'])
+	cc_compiler_opts = opt.add_option_group('Configuration options')
+	cc_compiler_opts.add_option('--check-c-compiler', default=None,
+		help='list of C compilers to try [%s]' % test_for_compiler,
+		dest="check_c_compiler")
+
+	for x in test_for_compiler.split():
+		opt.load('%s' % x)
+