VS: Provide an option to use x64 host tools

Visual Studio provides toolchains that are themselves built for 32-bit
or 64-bit host architectures.  By default it uses the 32-bit tools, but
it can be told to prefer the 64-bit tools on 64-bit hosts.  Extend the
`CMAKE_GENERATOR_TOOLSET` specification to provide a way to request
use of the 64-bit host tools.

Closes: #15622

1 files changed, 5 insertions, 0 deletions

diff --git a/Source/cmGlobalVisualStudio10Generator.h b/Source/cmGlobalVisualStudio10Generator.h
index 19c60aa..f8a50ac 100644
--- a/Source/cmGlobalVisualStudio10Generator.h
+++ b/Source/cmGlobalVisualStudio10Generator.h
@@ -22,6 +22,7 @@ public:
   virtual bool SetSystemName(std::string const& s, cmMakefile* mf);
   virtual bool SetGeneratorPlatform(std::string const& p, cmMakefile* mf);
   virtual bool SetGeneratorToolset(std::string const& ts, cmMakefile* mf);
+  virtual bool ParseGeneratorToolset(std::string const& ts, cmMakefile* mf);
 
   virtual void GenerateBuildCommand(
     std::vector<std::string>& makeCommand, const std::string& makeProgram,
@@ -48,6 +49,9 @@ public:
   /** The toolset name for the target platform.  */
   const char* GetPlatformToolset() const;
 
+  /** The toolset host architecture name (e.g. x64 for 64-bit host tools).  */
+  const char* GetPlatformToolsetHostArchitecture() const;
+
   /** Return the CMAKE_SYSTEM_NAME.  */
   std::string const& GetSystemName() const { return this->SystemName; }
 
@@ -101,6 +105,7 @@ protected:
   std::string const& GetMSBuildCommand();
 
   std::string GeneratorToolset;
+  std::string GeneratorToolsetHostArchitecture;
   std::string DefaultPlatformToolset;
   std::string WindowsTargetPlatformVersion;
   std::string SystemName;