Add support for dynamic dependencies in ad hoc Buildscript recipes

Specifically, add the new `depdb dyndep` builtin that can be used to extract
dynamic dependencies from a program run or a file. For example:

obje{hello.o}: cxx{hello}
{{
  s = $path($<[0])

  depdb dyndep $cxx.poptions $cc.poptions --what=header --default-prereq-type=h -- $cxx.path $cxx.poptions $cc.poptions $cxx.mode -M -MG $s

  diag c++ ($<[0])

  o = $path($>)
  $cxx.path $cxx.poptions $cc.poptions $cc.coptions $cxx.coptions $cxx.mode -o $o -c $s
}}

Currently only the `make` dependency format is supported.

1 files changed, 0 insertions, 57 deletions

diff --git a/libbuild2/cc/utility.cxx b/libbuild2/cc/utility.cxx
index ffe3e03..e02f85a 100644
--- a/libbuild2/cc/utility.cxx
+++ b/libbuild2/cc/utility.cxx
@@ -3,10 +3,6 @@
 
 #include <libbuild2/cc/utility.hxx>
 
-#include <libbuild2/file.hxx>
-
-using namespace std;
-
 namespace build2
 {
   namespace cc
@@ -17,58 +13,5 @@ namespace build2
     const dir_path module_build_dir (dir_path (module_dir) /= "build");
     const dir_path module_build_modules_dir (
       dir_path (module_build_dir) /= "modules");
-
-    void
-    normalize_header (path& f)
-    {
-      // Interestingly, on most paltforms and with most compilers (Clang on
-      // Linux being a notable exception) most system/compiler headers are
-      // already normalized.
-      //
-      path_abnormality a (f.abnormalities ());
-      if (a != path_abnormality::none)
-      {
-        // While we can reasonably expect this path to exit, things do go
-        // south from time to time (like compiling under wine with file
-        // wlantypes.h included as WlanTypes.h).
-        //
-        try
-        {
-          // If we have any parent components, then we have to verify the
-          // normalized path matches realized.
-          //
-          path r;
-          if ((a & path_abnormality::parent) == path_abnormality::parent)
-          {
-            r = f;
-            r.realize ();
-          }
-
-          try
-          {
-            f.normalize ();
-
-            // Note that we might still need to resolve symlinks in the
-            // normalized path.
-            //
-            if (!r.empty () && f != r && path (f).realize () != r)
-              f = move (r);
-          }
-          catch (const invalid_path&)
-          {
-            assert (!r.empty ()); // Shouldn't have failed if no `..`.
-            f = move (r);         // Fallback to realize.
-          }
-        }
-        catch (const invalid_path&)
-        {
-          fail << "invalid header path '" << f.string () << "'";
-        }
-        catch (const system_error& e)
-        {
-          fail << "invalid header path '" << f.string () << "': " << e;
-        }
-      }
-    }
   }
 }