Add support to indicate UTF-8 custom command pipe output encoding

Adds a flag to indicate that pipe output from a custom command should be
interpreted as UTF-8 encoded. This change does not introduce a public
way to set the flag, but generators that create internally-generated
commands know if they are calling cmake, which uses UTF-8 pipes.

MSBuild added support for interpreting output of PreBuildEvent,
PreLinkEvent, PostBuildEvent, and CustomBuildStep as UTF-8. This change
will appear in Visual Studio 16.6 Preview 3. It is opt-in, and you need
to add the StdOutEncoding tag. MSBuild treats these as property bags so
if we emit the tag for earlier versions of Visual Studio it would be
safely ignored. This change emits the StdOutEncoding tag and sets it to
UTF-8 whenever the custom command UTF-8 pipe flag is set. This fixes
globalization issues when the output from cmake contained characters
that required MSBuild to interpret as UTF-8 before displaying them.

1 files changed, 4 insertions, 3 deletions

diff --git a/Source/cmLocalVisualStudio7Generator.cxx b/Source/cmLocalVisualStudio7Generator.cxx
index 9148b27f92..82bbc61eec 100644
--- a/Source/cmLocalVisualStudio7Generator.cxx
+++ b/Source/cmLocalVisualStudio7Generator.cxx
@@ -251,14 +251,15 @@ cmSourceFile* cmLocalVisualStudio7Generator::CreateVCProjBuildRule()
   std::string argB = cmStrCat("-B", this->GetBinaryDirectory());
   std::string stampName =
     cmStrCat(this->GetCurrentBinaryDirectory(), "/CMakeFiles/generate.stamp");
+  bool stdPipesUTF8 = true;
   cmCustomCommandLines commandLines =
     cmMakeSingleCommandLine({ cmSystemTools::GetCMakeCommand(), argS, argB,
                               "--check-stamp-file", stampName });
   std::string comment = cmStrCat("Building Custom Rule ", makefileIn);
   const char* no_working_directory = nullptr;
-  this->AddCustomCommandToOutput(stampName, listFiles, makefileIn,
-                                 commandLines, comment.c_str(),
-                                 no_working_directory, true, false);
+  this->AddCustomCommandToOutput(
+    stampName, listFiles, makefileIn, commandLines, comment.c_str(),
+    no_working_directory, true, false, false, false, "", "", stdPipesUTF8);
   if (cmSourceFile* file = this->Makefile->GetSource(makefileIn)) {
     // Finalize the source file path now since we're adding this after
     // the generator validated all project-named sources.