Initial support for loading dependency info from buildfiles

Also a new iteration on the overall architecture. Now, for the first time,
build can read the buildfile and build itself.

g++-4.9 -std=c++14 -g -I.. -o bd bd.cxx algorithm.cxx scope.cxx parser.cxx lexer.cxx target.cxx prerequisite.cxx rule.cxx native.cxx cxx/target.cxx cxx/rule.cxx process.cxx timestamp.cxx path.cxx

g++-4.9 -std=c++14 -g -I../../.. -o driver driver.cxx ../../../build/lexer.cxx

g++-4.9 -std=c++14 -g -I../../.. -o driver driver.cxx ../../../build/lexer.cxx ../../../build/parser.cxx ../../../build/scope.cxx ../../../build/target.cxx ../../../build/native.cxx ../../../build/prerequisite.cxx ../../../build/path.cxx ../../../build/timestamp.cxx

1 files changed, 9 insertions, 2 deletions

diff --git a/build/path b/build/path
index 97fb154..bdb9b72 100644
--- a/build/path
+++ b/build/path
@@ -7,6 +7,7 @@
 
 #include <string>
 #include <ostream>
+#include <utility> // move
 #include <exception>
 
 namespace build
@@ -168,8 +169,14 @@ namespace build
     }
 
     explicit
-    basic_path (string_type const& s)
-        : path_ (s)
+    basic_path (string_type s)
+        : path_ (std::move (s))
+    {
+      init ();
+    }
+
+    basic_path (const string_type& s, size_type n)
+        : path_ (s, 0, n)
     {
       init ();
     }