target_link_libraries: Add PUBLIC/PRIVATE/INTERFACE keyword signature

Add a new signature to help populate INTERFACE_LINK_LIBRARIES and
LINK_LIBRARIES cleanly in a single call.  Add policy CMP0023 to control
whether the keyword signatures can be mixed with uses of the plain
signatures on the same target.

1 files changed, 8 insertions, 0 deletions

diff --git a/Source/cmTarget.h b/Source/cmTarget.h
index 0da0f12f80..24a71ed63f 100644
--- a/Source/cmTarget.h
+++ b/Source/cmTarget.h
@@ -190,6 +190,12 @@ public:
   void AddLinkLibrary(cmMakefile& mf,
                       const char *target, const char* lib,
                       LinkLibraryType llt);
+  enum TLLSignature {
+    KeywordTLLSignature,
+    PlainTLLSignature
+  };
+  bool PushTLLCommandTrace(TLLSignature signature);
+  void GetTllSignatureTraces(cmOStringStream &s, TLLSignature sig) const;
 
   void MergeLinkLibraries( cmMakefile& mf, const char* selfname,
                            const LinkLibraryVectorType& libs );
@@ -548,6 +554,8 @@ private:
   // directories.
   std::set<cmStdString> SystemIncludeDirectories;
 
+  std::vector<std::pair<TLLSignature, cmListFileBacktrace> > TLLCommands;
+
   /**
    * A list of direct dependencies. Use in conjunction with DependencyMap.
    */