Move exe{} to build2 core, add fallback extensions (existing files)

1 files changed, 5 insertions, 4 deletions

diff --git a/build2/target-type b/build2/target-type
index 378fd7c..5e7f59b 100644
--- a/build2/target-type
+++ b/build2/target-type
@@ -31,9 +31,10 @@ namespace build2
   // respectively. If the extension function returns NULL, then that means the
   // default extension for this target could not be derived.
   //
-  // The extension is primarily used in two places: search_existing_file()
-  // (called for a prerequisite) and in target::derive_path() (called for a
-  // target); see their implementations for details.
+  // The extension is used in two places: search_existing_file() (called for a
+  // prerequisite with the last argument true) and in target::derive_path()
+  // (called for a target with the last argument false); see their
+  // implementations for details.
   //
   struct target_type
   {
@@ -41,7 +42,7 @@ namespace build2
     const target_type* base;
     target* (*factory) (
       const target_type&, dir_path, dir_path, string, const string*);
-    const string* (*extension) (const target_key&, scope&);
+    const string* (*extension) (const target_key&, scope&, bool search);
     void (*print) (ostream&, const target_key&);
     target* (*search) (const prerequisite_key&);
     bool see_through; // A group with the default "see through" semantics.