Add abstract c_inc{} and cxx_inc{} target types

These abstract base target types are meant for deriving additional target
types (for example, Qt moc{}) that can be #include'd in C and C++ translation
units, respectively. In particular, only such targets will be considered to
reverse-lookup extensions to target types (see dyndep_rule::map_extension()
for background).

1 files changed, 1 insertions, 0 deletions

diff --git a/libbuild2/c/target.hxx b/libbuild2/c/target.hxx
index 39fcf89..c9955e3 100644
--- a/libbuild2/c/target.hxx
+++ b/libbuild2/c/target.hxx
@@ -17,6 +17,7 @@ namespace build2
     using cc::c;
     using cc::m;
     using cc::S;
+    using cc::c_inc;
   }
 }