Enable Unicode output to Windows consoles

Use KWSys ConsoleBuf to replace the `streambuf` on `std::cout` and
`std::cerr` so that process output can be encoded correctly for display
in a Windows console.

CMakeLists.txt

@@ -260,6 +260,7 @@ macro (CMAKE_BUILD_UTILITIES)
   set(KWSYS_USE_MD5 1)
   set(KWSYS_USE_Process 1)
   set(KWSYS_USE_CommandLineArguments 1)
+  set(KWSYS_USE_ConsoleBuf 1)
   set(KWSYS_HEADER_ROOT ${CMake_BINARY_DIR}/Source)
   set(KWSYS_INSTALL_DOC_DIR "${CMAKE_DOC_DIR}")
   add_subdirectory(Source/kwsys)

Source/CPack/cpack.cxx

@@ -17,6 +17,9 @@
 
 #include <cmsys/CommandLineArguments.hxx>
 #include <cmsys/Encoding.hxx>
+#if defined(_WIN32) && defined(CMAKE_BUILD_WITH_CMAKE)
+#include <cmsys/ConsoleBuf.hxx>
+#endif
 #include <iostream>
 #include <map>
 #include <sstream>
@@ -84,6 +87,11 @@ int cpackDefinitionArgument(const char* argument, const char* cValue,
 // this is CPack.
 int main(int argc, char const* const* argv)
 {
+#if defined(_WIN32) && defined(CMAKE_BUILD_WITH_CMAKE)
+  // Replace streambuf so we can output Unicode to console
+  cmsys::ConsoleBuf::Manager consoleOut(std::cout);
+  cmsys::ConsoleBuf::Manager consoleErr(std::cerr, true);
+#endif
   cmsys::Encoding::CommandLineArguments args =
     cmsys::Encoding::CommandLineArguments::Main(argc, argv);
   argc = args.argc();

Source/cmakemain.cxx

@@ -18,6 +18,9 @@
 
 #include <cmConfigure.h>
 #include <cmsys/Encoding.hxx>
+#if defined(_WIN32) && defined(CMAKE_BUILD_WITH_CMAKE)
+#include <cmsys/ConsoleBuf.hxx>
+#endif
 #include <iostream>
 #include <string.h>
 #include <string>
@@ -153,6 +156,11 @@ static void cmakemainProgressCallback(const char* m, float prog,
 
 int main(int ac, char const* const* av)
 {
+#if defined(_WIN32) && defined(CMAKE_BUILD_WITH_CMAKE)
+  // Replace streambuf so we can output Unicode to console
+  cmsys::ConsoleBuf::Manager consoleOut(std::cout);
+  cmsys::ConsoleBuf::Manager consoleErr(std::cerr, true);
+#endif
   cmsys::Encoding::CommandLineArguments args =
     cmsys::Encoding::CommandLineArguments::Main(ac, av);
   ac = args.argc();

Source/ctest.cxx

@@ -10,6 +10,9 @@
 #include "cmake.h"
 
 #include <cmsys/Encoding.hxx>
+#if defined(_WIN32) && defined(CMAKE_BUILD_WITH_CMAKE)
+#include <cmsys/ConsoleBuf.hxx>
+#endif
 #include <iostream>
 #include <string.h>
 #include <string>
@@ -110,6 +113,11 @@ static const char* cmDocumentationOptions[][2] = {
 // this is a test driver program for cmCTest.
 int main(int argc, char const* const* argv)
 {
+#if defined(_WIN32) && defined(CMAKE_BUILD_WITH_CMAKE)
+  // Replace streambuf so we can output Unicode to console
+  cmsys::ConsoleBuf::Manager consoleOut(std::cout);
+  cmsys::ConsoleBuf::Manager consoleErr(std::cerr, true);
+#endif
   cmsys::Encoding::CommandLineArguments encoding_args =
     cmsys::Encoding::CommandLineArguments::Main(argc, argv);
   argc = encoding_args.argc();