Some tests are reduced to single cpp.

cpp/std_locale.cpp

@@ -0,0 +1,32 @@
+/* Check cf5-opt.vim defs.
+VIM: let g:lcppflags="-std=c++11 -O2 -pthread"
+VIM: let g:wcppflags="/O2 /EHsc /DWIN32"
+VIM: let g:cppflags=g:Iboost.g:Itbb
+VIM: let g:ldflags=g:Lboost.g:Ltbb.g:tbbmalloc.g:tbbmproxy
+VIM: let g:ldlibpath=g:Bboost.g:Btbb
+VIM: let g:argv=""
+VIM-: let g:cf5output=0
+*/
+
+#include <locale>
+#include <iostream>
+
+int main(int argc, const char* argv[])
+try
+{
+	std::cout << "name of current global locale: " << std::locale().name() << "\n";
+	std::cout << "name of classic C locale: " << std::locale::classic().name() << "\n";
+	std::cout << "name of \"user's preferred locale\": " << std::locale("").name () << "\n";
+
+	std::cout.imbue( std::locale( "fr" ) );
+	std::cerr.imbue( std::locale( "en_US" ) );
+
+	std::cout << "fr: " << 1.1 << std::endl;
+	std::cerr << "us: " << 1.1 << std::endl;
+	return 0;
+}
+catch (...)
+{
+	std::cerr << "crash!!!" << std::endl;
+	return 1;
+}