From 8c96b17a5393bffee0c521c4872a9fa999048032 Mon Sep 17 00:00:00 2001
From: David Robillard <d@drobilla.net>
Date: Sat, 15 Sep 2018 14:51:02 +0200
Subject: Squashed 'waflib/' content from commit 982416b

git-subtree-dir: waflib
git-subtree-split: 982416b8a6c6728e200243e1be3ab60435c08830
---
 Tools/compiler_cxx.py | 111 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 111 insertions(+)
 create mode 100644 Tools/compiler_cxx.py

(limited to 'Tools/compiler_cxx.py')

diff --git a/Tools/compiler_cxx.py b/Tools/compiler_cxx.py
new file mode 100644
index 0000000..1af65a2
--- /dev/null
+++ b/Tools/compiler_cxx.py
@@ -0,0 +1,111 @@
+#!/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 (g++, msvc, etc)::
+
+	def options(opt):
+		opt.load('compiler_cxx')
+	def configure(cnf):
+		cnf.load('compiler_cxx')
+	def build(bld):
+		bld.program(source='main.cpp', target='app')
+
+The compilers are associated to platforms in :py:attr:`waflib.Tools.compiler_cxx.cxx_compiler`. To register
+a new C++ compiler named *cfoo* (assuming the tool ``waflib/extras/cfoo.py`` exists), use::
+
+	from waflib.Tools.compiler_cxx import cxx_compiler
+	cxx_compiler['win32'] = ['cfoo', 'msvc', 'gcc']
+
+	def options(opt):
+		opt.load('compiler_cxx')
+	def configure(cnf):
+		cnf.load('compiler_cxx')
+	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::
+
+	$ CXX=clang waf configure
+"""
+
+
+import re
+from waflib.Tools import ccroot
+from waflib import Utils
+from waflib.Logs import debug
+
+cxx_compiler = {
+'win32':  ['msvc', 'g++', 'clang++'],
+'cygwin': ['g++'],
+'darwin': ['clang++', 'g++'],
+'aix':    ['xlc++', 'g++', 'clang++'],
+'linux':  ['g++', 'clang++', 'icpc'],
+'sunos':  ['sunc++', 'g++'],
+'irix':   ['g++'],
+'hpux':   ['g++'],
+'osf1V':  ['g++'],
+'gnu':    ['g++', 'clang++'],
+'java':   ['g++', 'msvc', 'clang++', 'icpc'],
+'default': ['clang++', 'g++']
+}
+"""
+Dict mapping the platform names to Waf tools finding specific C++ compilers::
+
+	from waflib.Tools.compiler_cxx import cxx_compiler
+	cxx_compiler['linux'] = ['gxx', 'icpc', 'suncxx']
+"""
+
+def default_compilers():
+	build_platform = Utils.unversioned_sys_platform()
+	possible_compiler_list = cxx_compiler.get(build_platform, cxx_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_cxx_compiler or default_compilers()
+	except AttributeError:
+		conf.fatal("Add options(opt): opt.load('compiler_cxx')")
+
+	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_cxx: %r', e)
+		else:
+			if conf.env.CXX:
+				conf.end_msg(conf.env.get_flat('CXX'))
+				conf.env.COMPILER_CXX = 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-cxx-compiler=gxx
+	"""
+	test_for_compiler = default_compilers()
+	opt.load_special_tools('cxx_*.py')
+	cxx_compiler_opts = opt.add_option_group('Configuration options')
+	cxx_compiler_opts.add_option('--check-cxx-compiler', default=None,
+		help='list of C++ compilers to try [%s]' % test_for_compiler,
+		dest="check_cxx_compiler")
+
+	for x in test_for_compiler.split():
+		opt.load('%s' % x)
+
-- 
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