Ninja: Add `$subdir/all` targets

With the Makefile generator one can use `cd $subdir; make all` to build
all targets associated with a given subdirectory.  This is not possible
to do with the Ninja generator since there is only one `build.ninja`
file at the top of the build tree.  However, we can approximate it by
allowing one to run `ninja $subdir/all` at the top of the tree to build
the targets in the corresponding subdirectory.

Port logic from cmGlobalUnixMakefileGenerator3::WriteDirectoryRule2 to
cmGlobalNinjaGenerator in order to produce equivalent directory-level
targets.

1 files changed, 3 insertions, 0 deletions

diff --git a/Source/cmGlobalNinjaGenerator.h b/Source/cmGlobalNinjaGenerator.h
index 8656590..3023a95 100644
--- a/Source/cmGlobalNinjaGenerator.h
+++ b/Source/cmGlobalNinjaGenerator.h
@@ -228,6 +228,8 @@ public:
     return this->RulesFileStream; }
 
   std::string ConvertToNinjaPath(const std::string& path);
+  std::string ConvertToNinjaFolderRule(const std::string& path);
+
 
   struct MapToNinjaPathImpl {
     cmGlobalNinjaGenerator* GG;
@@ -342,6 +344,7 @@ private:
   void WriteAssumedSourceDependencies();
 
   void WriteTargetAliases(std::ostream& os);
+  void WriteFolderTargets(std::ostream& os);
   void WriteUnknownExplicitDependencies(std::ostream& os);
 
   void WriteBuiltinTargets(std::ostream& os);