Teach link_directories to recognize relative paths

We create CMake Policy CMP0015 to make link_directories() treat relative
paths with respect to the source tree while retaining compatibility.
This makes it consistent with include_directories() and other commands.

Changes based on patch from Alex.  See issue #9697.

1 files changed, 2 insertions, 0 deletions

diff --git a/Source/cmLinkDirectoriesCommand.h b/Source/cmLinkDirectoriesCommand.h
index 73673c4407..e5ff4f0f32 100644
--- a/Source/cmLinkDirectoriesCommand.h
+++ b/Source/cmLinkDirectoriesCommand.h
@@ -70,6 +70,8 @@ public:
     }
   
   cmTypeMacro(cmLinkDirectoriesCommand, cmCommand);
+private:
+  void AddLinkDir(std::string const& dir);
 };