Implement auxiliary dependency database (.d files), use in cxx.compile

This is part of the "High Fidelity Build" work.

1 files changed, 10 insertions, 7 deletions

diff --git a/build2/cxx/utility b/build2/cxx/utility
index 7072c7b..307e1b4 100644
--- a/build2/cxx/utility
+++ b/build2/cxx/utility
@@ -10,25 +10,28 @@
 
 #include <build2/target>
 
-#include <build2/config/utility>
-
 namespace build2
 {
   namespace cxx
   {
-    using config::append_options;
-
     // T is either target or scope.
     //
     template <typename T>
     void
-    append_std (cstrings& args, T&, string& storage);
+    append_std (cstrings&, T&, string& storage);
 
-    // Append library options from one of the cxx.export.* variables
+    template <typename T>
+    void
+    hash_std (sha256&, T&);
+
+    // Append or hash library options from one of the cxx.export.* variables
     // recursively, prerequisite libraries first.
     //
     void
-    append_lib_options (cstrings& args, target&, const char* variable);
+    append_lib_options (cstrings&, target&, const char* variable);
+
+    void
+    hash_lib_options (sha256&, target&, const char* variable);
   }
 }