waifulib: update

scripts/waifulib/cxx11.py

@@ -0,0 +1,74 @@
+# encoding: utf-8
+# cxx11.py -- check if compiler can compile C++11 code with lambdas
+# Copyright (C) 2018 a1batross
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+
+try: from fwgslib import get_flags_by_compiler
+except: from waflib.extras.fwgslib import get_flags_by_compiler
+from waflib import Configure
+
+# Input:
+#   CXX11_MANDATORY(optional) -- fail if C++11 not available
+# Output:
+#   HAVE_CXX11 -- true if C++11 available, otherwise false
+
+modern_cpp_flags = {
+	'msvc':    [],
+	'default': ['-std=c++11']
+}
+
+CXX11_LAMBDA_FRAGMENT='''
+class T
+{
+	static void M(){}
+public:
+	void t()
+	{
+		auto l = []()
+		{
+			T::M();
+		};
+	}
+};
+
+int main()
+{
+	T t;
+	t.t();
+}
+'''
+
+@Configure.conf
+def check_cxx11(ctx, *k, **kw):
+	if not 'msg' in kw:
+		kw['msg'] = 'Checking if \'%s\' supports C++11' % ctx.env.COMPILER_CXX
+
+	if not 'mandatory' in kw:
+		kw['mandatory'] = False
+
+	# not best way, but this check
+	# was written for exactly mainui_cpp,
+	# where lambdas are mandatory
+	return ctx.check_cxx(fragment=CXX11_LAMBDA_FRAGMENT, *k, **kw)
+
+def configure(conf):
+	flags = get_flags_by_compiler(modern_cpp_flags, conf.env.COMPILER_CXX)
+
+	if conf.check_cxx11():
+		conf.env.HAVE_CXX11 = True
+	elif len(flags) != 0 and conf.check_cxx11(msg='...trying with additional flags', cxxflags = flags):
+		conf.env.HAVE_CXX11 = True
+		conf.env.CXXFLAGS += flags
+	else:
+		conf.env.HAVE_CXX11 = False
+
+		if conf.env.CXX11_MANDATORY:
+			conf.fatal('C++11 support not available!')