Ninja: Support embedding of CMake as subninja project

Add a `CMAKE_NINJA_OUTPUT_PATH_PREFIX` variable.  When it is set, CMake
generates a `build.ninja` file suitable for embedding into another ninja
project potentially generated by an alien generator.

1 files changed, 5 insertions, 0 deletions

diff --git a/Source/cmGlobalNinjaGenerator.h b/Source/cmGlobalNinjaGenerator.h
index 15c0f34..6d9bfe8 100644
--- a/Source/cmGlobalNinjaGenerator.h
+++ b/Source/cmGlobalNinjaGenerator.h
@@ -315,6 +315,8 @@ public:
   bool SupportsConsolePool() const;
 
   std::string NinjaOutputPath(std::string const& path);
+  bool HasOutputPathPrefix() const { return !this->OutputPathPrefix.empty(); }
+  void StripNinjaOutputPathPrefixAsSuffix(std::string& path);
 
 protected:
   virtual void Generate();
@@ -401,6 +403,9 @@ private:
   std::string NinjaVersion;
 
 private:
+  void InitOutputPathPrefix();
+
+  std::string OutputPathPrefix;
   std::string TargetAll;
   std::string CMakeCacheFile;
 };