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/cmGlobalVisualStudio11Generator.cxx b/Source/cmGlobalVisualStudio11Generator.cxx
index a44058b..0aaf2bb 100644
--- a/Source/cmGlobalVisualStudio11Generator.cxx
+++ b/Source/cmGlobalVisualStudio11Generator.cxx
@@ -93,6 +93,22 @@ public:
 
   bool SupportsToolset() const override { return true; }
   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("ARM");
+
+    std::set<std::string> installedSDKs =
+      cmGlobalVisualStudio11Generator::GetInstalledWindowsCESDKs();
+    for (std::string const& i : installedSDKs) {
+      platforms.emplace_back(i);
+    }
+
+    return platforms;
+  }
 };
 
 cmGlobalGeneratorFactory* cmGlobalVisualStudio11Generator::NewFactory()