Redesign obj to exe/lib mapping

Specifically:

* objso{} and libso{} target types have been renamed to objs{} and libs{}

* obje{} has been added (so now we have obje{}, obja{}, and objs{})

* obje{} is now used for building exe{}

* object file extensions have been changed to use "hierarchical extensions"
  that reflect the extension of the corresponding exe/lib target (instead of
  the -so suffix we used), specifically:

  obje{}: foo.o, (UNIX), foo.exe.o (MinGW), foo.exe.obj (Windows)
  obja{}: foo.a.o (UNIX, MinGW), foo.lib.obj (Windows)
  objs{}: foo.so.o (UNIX), foo.dylib.o (Darwin), foo.dll.o (MinGW),
          foo.dll.obj (Windows)

1 files changed, 0 insertions, 20 deletions

diff --git a/build2/cxx/link b/build2/cxx/link
index ca45e17..4f00ea0 100644
--- a/build2/cxx/link
+++ b/build2/cxx/link
@@ -33,26 +33,6 @@ namespace build2
 
       static link instance;
 
-    public:
-      enum class type {e, a, so};
-      enum class order {a, so, a_so, so_a};
-
-      static type
-      link_type (target& t)
-      {
-        return t.is_a<bin::exe> ()
-          ? type::e
-          : (t.is_a<bin::liba> () ? type::a : type::so);
-      }
-
-      static order
-      link_order (target&);
-
-      // Determine the library member (liba or libso) to link.
-      //
-      static target&
-      link_member (bin::lib&, order);
-
     private:
       friend class compile;