Add global generator factory method to get list of known platforms

Add a `cmGlobalGeneratorFactory::GetKnownPlatforms` method to return
a list of known possible values for `CMAKE_GENERATOR_PLATFORM`.
Implement the method for each generator by referencing the list of
possible values documented in `Help/generator/*.rst` for it.

Co-Author: Julien Jomier <julien.jomier@kitware.com>

1 files changed, 16 insertions, 0 deletions

diff --git a/Source/cmGlobalVisualStudio9Generator.cxx b/Source/cmGlobalVisualStudio9Generator.cxx
index d72b25b4af..15a83afeca 100644
--- a/Source/cmGlobalVisualStudio9Generator.cxx
+++ b/Source/cmGlobalVisualStudio9Generator.cxx
@@ -83,6 +83,22 @@ public:
 
   bool SupportsToolset() const override { return false; }
   bool SupportsPlatform() const override { return true; }
+
+  std::vector<std::string> GetKnownPlatforms() const override
+  {
+    std::vector<std::string> platforms;
+    platforms.emplace_back("x64");
+    platforms.emplace_back("Win32");
+    platforms.emplace_back("Itanium");
+    cmVisualStudioWCEPlatformParser parser;
+    parser.ParseVersion("9.0");
+    const std::vector<std::string>& availablePlatforms =
+      parser.GetAvailablePlatforms();
+    for (std::string const& i : availablePlatforms) {
+      platforms.emplace_back(i);
+    }
+    return platforms;
+  }
 };
 
 cmGlobalGeneratorFactory* cmGlobalVisualStudio9Generator::NewFactory()