Rework extension handling logic

We no longer support hxx{vector.}. Rather, the target type can decide,
e.g., based on a config variable, whether to append an extension. Also,
in the future we may support a syntax to specify that this is a complete
name, e.g., hxx{'vector'}.

1 files changed, 4 insertions, 0 deletions

diff --git a/build/cxx/rule.cxx b/build/cxx/rule.cxx
index 8d2c0b2..26ad213 100644
--- a/build/cxx/rule.cxx
+++ b/build/cxx/rule.cxx
@@ -208,6 +208,10 @@ namespace build
             // extension. Here we can assume the name part is a valid
             // filesystem name.
             //
+            // Note that if the file has no extension, we record an empty
+            // extension rather than NULL (which would signify that the
+            // extension needs to be added).
+            //
             path d (file.directory ());
             string n (file.leaf ().base ().string ());
             const char* es (file.extension ());