Implement support for definition target type aliases

For example:

define cli=file

Currently, the semantics is that of a real alias with only name differences
that are used for display. See tests/define/buildfile for more use cases.

15 files changed, 246 insertions, 86 deletions

diff --git a/build/bin/target b/build/bin/target
index 729f119..cbabcaf 100644
--- a/build/bin/target
+++ b/build/bin/target
@@ -19,8 +19,8 @@ namespace build
       using file::file;
 
     public:
-      virtual const target_type& type () const {return static_type;}
       static const target_type static_type;
+      virtual const target_type& dynamic_type () const {return static_type;}
     };
 
     class objso: public file
@@ -29,8 +29,8 @@ namespace build
       using file::file;
 
     public:
-      virtual const target_type& type () const {return static_type;}
       static const target_type static_type;
+      virtual const target_type& dynamic_type () const {return static_type;}
     };
 
     class obj: public target
@@ -42,8 +42,8 @@ namespace build
       objso* so {nullptr};
 
     public:
-      virtual const target_type& type () const {return static_type;}
       static const target_type static_type;
+      virtual const target_type& dynamic_type () const {return static_type;}
     };
 
     class exe: public file
@@ -52,8 +52,8 @@ namespace build
       using file::file;
 
     public:
-      virtual const target_type& type () const {return static_type;}
       static const target_type static_type;
+      virtual const target_type& dynamic_type () const {return static_type;}
     };
 
     // The lib{} target group.
@@ -64,8 +64,8 @@ namespace build
       using file::file;
 
     public:
-      virtual const target_type& type () const {return static_type;}
       static const target_type static_type;
+      virtual const target_type& dynamic_type () const {return static_type;}
     };
 
     class libso: public file
@@ -74,8 +74,8 @@ namespace build
       using file::file;
 
     public:
-      virtual const target_type& type () const {return static_type;}
       static const target_type static_type;
+      virtual const target_type& dynamic_type () const {return static_type;}
     };
 
     class lib: public target
@@ -90,8 +90,8 @@ namespace build
       reset (action_type);
 
     public:
-      virtual const target_type& type () const {return static_type;}
       static const target_type static_type;
+      virtual const target_type& dynamic_type () const {return static_type;}
     };
   }
 }
diff --git a/build/bin/target.cxx b/build/bin/target.cxx
index 5a1bb92..c2c5e05 100644
--- a/build/bin/target.cxx
+++ b/build/bin/target.cxx
@@ -11,10 +11,10 @@ namespace build
   namespace bin
   {
     static target*
-    obja_factory (dir_path d, std::string n, const std::string* e)
+    obja_factory (const target_type&, dir_path d, string n, const string* e)
     {
       obj* o (targets.find<obj> (d, n));
-      obja* a (new obja (std::move (d), std::move (n), e));
+      obja* a (new obja (move (d), move (n), e));
 
       if ((a->group = o))
         o->a = a;
@@ -30,14 +30,15 @@ namespace build
       &obja_factory,
       nullptr,
       &search_target, // Note: not _file(); don't look for an existing file.
-      false
+      false,
+      nullptr
     };
 
     static target*
-    objso_factory (dir_path d, std::string n, const std::string* e)
+    objso_factory (const target_type&, dir_path d, string n, const string* e)
     {
       obj* o (targets.find<obj> (d, n));
-      objso* so (new objso (std::move (d), std::move (n), e));
+      objso* so (new objso (move (d), move (n), e));
 
       if ((so->group = o))
         o->so = so;
@@ -53,11 +54,12 @@ namespace build
       &objso_factory,
       nullptr,
       &search_target, // Note: not _file(); don't look for an existing file.
-      false
+      false,
+      nullptr
     };
 
     static target*
-    obj_factory (dir_path d, string n, const string* e)
+    obj_factory (const target_type&, dir_path d, string n, const string* e)
     {
       obja* a (targets.find<obja> (d, n));
       objso* so (targets.find<objso> (d, n));
@@ -80,7 +82,8 @@ namespace build
       &obj_factory,
       nullptr,
       &search_target,
-      false
+      false,
+      nullptr
     };
 
     const target_type exe::static_type
@@ -91,14 +94,15 @@ namespace build
       &target_factory<exe>,
       nullptr,
       &search_file,
-      false
+      false,
+      nullptr
     };
 
     static target*
-    liba_factory (dir_path d, std::string n, const std::string* e)
+    liba_factory (const target_type&, dir_path d, string n, const string* e)
     {
       lib* l (targets.find<lib> (d, n));
-      liba* a (new liba (std::move (d), std::move (n), e));
+      liba* a (new liba (move (d), move (n), e));
 
       if ((a->group = l))
         l->a = a;
@@ -127,14 +131,15 @@ namespace build
       &liba_factory,
       &target_extension_fix<a_ext>,
       &search_file,
-      false
+      false,
+      nullptr
     };
 
     static target*
-    libso_factory (dir_path d, std::string n, const std::string* e)
+    libso_factory (const target_type&, dir_path d, string n, const string* e)
     {
       lib* l (targets.find<lib> (d, n));
-      libso* so (new libso (std::move (d), std::move (n), e));
+      libso* so (new libso (move (d), move (n), e));
 
       if ((so->group = l))
         l->so = so;
@@ -151,7 +156,8 @@ namespace build
       &libso_factory,
       &target_extension_fix<so_ext>,
       &search_file,
-      false
+      false,
+      nullptr
     };
 
     // lib
@@ -164,7 +170,7 @@ namespace build
     }
 
     static target*
-    lib_factory (dir_path d, string n, const string* e)
+    lib_factory (const target_type&, dir_path d, string n, const string* e)
     {
       liba* a (targets.find<liba> (d, n));
       libso* so (targets.find<libso> (d, n));
@@ -187,7 +193,8 @@ namespace build
       &lib_factory,
       nullptr,
       &search_target,
-      false
+      false,
+      nullptr
     };
   }
 }
diff --git a/build/cli/target b/build/cli/target
index 7ee9a98..dbb05bd 100644
--- a/build/cli/target
+++ b/build/cli/target
@@ -19,8 +19,8 @@ namespace build
       using file::file;
 
     public:
-      virtual const target_type& type () const {return static_type;}
       static const target_type static_type;
+      virtual const target_type& dynamic_type () const {return static_type;}
     };
 
     class cli_cxx: public mtime_target
@@ -53,8 +53,8 @@ namespace build
       load_mtime () const;
 
     public:
-      virtual const target_type& type () const {return static_type;}
       static const target_type static_type;
+      virtual const target_type& dynamic_type () const {return static_type;}
     };
   }
 }
diff --git a/build/cli/target.cxx b/build/cli/target.cxx
index e8ca1cf..0666335 100644
--- a/build/cli/target.cxx
+++ b/build/cli/target.cxx
@@ -24,7 +24,8 @@ namespace build
       &target_factory<cli>,
       &target_extension_fix<cli_ext>,
       &search_file,
-      false
+      false,
+      nullptr
     };
 
     // cli.cxx
@@ -47,7 +48,7 @@ namespace build
     }
 
     static target*
-    cli_cxx_factory (dir_path d, string n, const string* e)
+    cli_cxx_factory (const target_type&, dir_path d, string n, const string* e)
     {
       tracer trace ("cli::cli_cxx_factory");
 
@@ -71,7 +72,8 @@ namespace build
       &cli_cxx_factory,
       nullptr,
       &search_target,
-      true // "See through" default iteration mode.
+      true, // "See through" default iteration mode.
+      nullptr
     };
   }
 }
diff --git a/build/cxx/target b/build/cxx/target
index bcc5ff1..fe27c79 100644
--- a/build/cxx/target
+++ b/build/cxx/target
@@ -17,8 +17,8 @@ namespace build
       using file::file;
 
     public:
-      virtual const target_type& type () const {return static_type;}
       static const target_type static_type;
+      virtual const target_type& dynamic_type () const {return static_type;}
     };
 
     class ixx: public file
@@ -27,8 +27,8 @@ namespace build
       using file::file;
 
     public:
-      virtual const target_type& type () const {return static_type;}
       static const target_type static_type;
+      virtual const target_type& dynamic_type () const {return static_type;}
     };
 
     class txx: public file
@@ -37,8 +37,8 @@ namespace build
       using file::file;
 
     public:
-      virtual const target_type& type () const {return static_type;}
       static const target_type static_type;
+      virtual const target_type& dynamic_type () const {return static_type;}
     };
 
     class cxx: public file
@@ -47,8 +47,8 @@ namespace build
       using file::file;
 
     public:
-      virtual const target_type& type () const {return static_type;}
       static const target_type static_type;
+      virtual const target_type& dynamic_type () const {return static_type;}
     };
 
     //@@ TMP
@@ -59,8 +59,8 @@ namespace build
       using file::file;
 
     public:
-      virtual const target_type& type () const {return static_type;}
       static const target_type static_type;
+      virtual const target_type& dynamic_type () const {return static_type;}
     };
 
     class c: public file
@@ -69,8 +69,8 @@ namespace build
       using file::file;
 
     public:
-      virtual const target_type& type () const {return static_type;}
       static const target_type static_type;
+      virtual const target_type& dynamic_type () const {return static_type;}
     };
   }
 }
diff --git a/build/cxx/target.cxx b/build/cxx/target.cxx
index c23fdd0..e3d98e7 100644
--- a/build/cxx/target.cxx
+++ b/build/cxx/target.cxx
@@ -19,7 +19,8 @@ namespace build
       &target_factory<hxx>,
       &target_extension_var<hxx_ext_var>,
       &search_file,
-      false
+      false,
+      nullptr
     };
 
     constexpr const char ixx_ext_var[] = "ixx.ext";
@@ -31,7 +32,8 @@ namespace build
       &target_factory<ixx>,
       &target_extension_var<ixx_ext_var>,
       &search_file,
-      false
+      false,
+      nullptr
     };
 
     constexpr const char txx_ext_var[] = "txx.ext";
@@ -43,7 +45,8 @@ namespace build
       &target_factory<txx>,
       &target_extension_var<txx_ext_var>,
       &search_file,
-      false
+      false,
+      nullptr
     };
 
     constexpr const char cxx_ext_var[] = "cxx.ext";
@@ -55,7 +58,8 @@ namespace build
       &target_factory<cxx>,
       &target_extension_var<cxx_ext_var>,
       &search_file,
-      false
+      false,
+      nullptr
     };
 
     constexpr const char h_ext_var[] = "h.ext";
@@ -67,7 +71,8 @@ namespace build
       &target_factory<h>,
       &target_extension_var<h_ext_var>,
       &search_file,
-      false
+      false,
+      nullptr
     };
 
     constexpr const char c_ext_var[] = "c.ext";
@@ -79,7 +84,8 @@ namespace build
       &target_factory<c>,
       &target_extension_var<c_ext_var>,
       &search_file,
-      false
+      false,
+      nullptr
     };
   }
 }
diff --git a/build/parser b/build/parser
index e37e68a..4390c67 100644
--- a/build/parser
+++ b/build/parser
@@ -72,6 +72,9 @@ namespace build
     using_ (token&, token_type&);
 
     void
+    define (token&, token_type&);
+
+    void
     variable (token&, token_type&, std::string name, token_type kind);
 
     std::string
diff --git a/build/parser.cxx b/build/parser.cxx
index bc6caa9..4981347 100644
--- a/build/parser.cxx
+++ b/build/parser.cxx
@@ -12,6 +12,9 @@
 #include <iterator> // make_move_iterator()
 #include <iostream>
 
+#include <build/types>
+#include <build/utility>
+
 #include <build/token>
 #include <build/lexer>
 
@@ -130,6 +133,11 @@ namespace build
           using_ (t, tt);
           continue;
         }
+        else if (n == "define")
+        {
+          define (t, tt);
+          continue;
+        }
       }
 
       // ': foo' is equvalent to '{}: foo' and to 'dir{}: foo'.
@@ -343,7 +351,7 @@ namespace build
                 const target_type* ti (
                   n.untyped ()
                   ? &target::static_type
-                  : scope_->find_target_type (n.type.c_str ()));
+                  : scope_->find_target_type (n.type));
 
                 if (ti == nullptr)
                   fail (nloc) << "unknown target type " << n.type;
@@ -799,6 +807,72 @@ namespace build
       fail (t) << "expected newline instead of " << t;
   }
 
+  static target*
+  alias_factory (const target_type& tt, dir_path d, string n, const string* e)
+  {
+    assert (tt.origin != nullptr);
+    target* r (tt.origin->factory (*tt.origin, move (d), move (n), e));
+    r->alias_type = &tt;
+    return r;
+  }
+
+  void parser::
+  define (token& t, token_type& tt)
+  {
+    // define <alias>=<name>
+    //
+    // See tests/define/buildfile.
+    //
+    if (next (t, tt) != type::name)
+      fail (t) << "expected name instead of " << t << " in target type "
+               << "definition";
+
+    string a (move (t.value));
+    const location al (get_location (t, &path_));
+
+    if (next (t, tt) != type::equal)
+      fail (t) << "expected '=' instead of " << t << " in target type "
+               << "definition";
+
+    next (t, tt);
+
+    if (tt == type::name)
+    {
+      // Alias.
+      //
+      const string& n (t.value);
+      const target_type* ntt (scope_->find_target_type (n));
+
+      if (ntt == nullptr)
+        fail (t) << "unknown target type " << n;
+
+      unique_ptr<target_type> att (new target_type (*ntt));
+      att->factory = &alias_factory;
+      att->origin = ntt->origin != nullptr ? ntt->origin : ntt;
+
+      target_type& ratt (*att); // Save non-const reference to the object.
+
+      auto pr (scope_->target_types.emplace (a, target_type_ref (move (att))));
+
+      if (!pr.second)
+        fail (al) << "target type " << a << " already define in this scope";
+
+      // Patch the alias name to use the map's key storage.
+      //
+      ratt.name = pr.first->first.c_str ();
+
+      next (t, tt); // Get newline.
+    }
+    else
+      fail (t) << "expected name instead of " << t << " in target type "
+               << "definition";
+
+    if (tt == type::newline)
+      next (t, tt);
+    else if (tt != type::eos)
+      fail (t) << "expected newline instead of " << t;
+  }
+
   void parser::
   print (token& t, token_type& tt)
   {
diff --git a/build/scope b/build/scope
index 2afc9f4..8b0d0ad 100644
--- a/build/scope
+++ b/build/scope
@@ -12,6 +12,8 @@
 #include <butl/path-map>
 
 #include <build/types>
+#include <build/utility>
+
 #include <build/module>
 #include <build/variable>
 #include <build/prerequisite>
@@ -138,7 +140,7 @@ namespace build
     target_type_map target_types;
 
     const target_type*
-    find_target_type (const char*, const scope** = nullptr) const;
+    find_target_type (const string&, const scope** = nullptr) const;
 
     // Given a name, figure out its type, taking into account extensions,
     // special names (e.g., '.' and '..'), or anything else that might be
@@ -147,7 +149,7 @@ namespace build
     // necessarily normalized). Return NULL if not found.
     //
     const target_type*
-    find_target_type (name&, const std::string*& ext) const;
+    find_target_type (name&, const string*& ext) const;
 
     // Rules.
     //
diff --git a/build/scope.cxx b/build/scope.cxx
index 53e3a53..d407ce0 100644
--- a/build/scope.cxx
+++ b/build/scope.cxx
@@ -44,7 +44,7 @@ namespace build
   }
 
   const target_type* scope::
-  find_target_type (const char* tt, const scope** rs) const
+  find_target_type (const string& tt, const scope** rs) const
   {
     // Search scopes outwards, stopping at the project root.
     //
@@ -69,6 +69,9 @@ namespace build
     return nullptr;
   }
 
+  static const string dir_tt ("dir");
+  static const string file_tt ("file");
+
   const target_type* scope::
   find_target_type (name& n, const string*& ext) const
   {
@@ -78,22 +81,22 @@ namespace build
 
     // First determine the target type.
     //
-    const char* tt;
+    const string* tt;
     if (n.untyped ())
     {
       // Empty name or '.' and '..' signify a directory.
       //
       if (v.empty () || v == "." || v == "..")
-        tt = "dir";
+        tt = &dir_tt;
       else
         //@@ TODO: derive type from extension.
         //
-        tt = "file";
+        tt = &file_tt;
     }
     else
-      tt = n.type.c_str ();
+      tt = &n.type;
 
-    const target_type* r (find_target_type (tt));
+    const target_type* r (find_target_type (*tt));
 
     if (r == nullptr)
       return r;
diff --git a/build/target b/build/target
index a866c98..a1c7880 100644
--- a/build/target
+++ b/build/target
@@ -22,6 +22,8 @@
 #include <butl/multi-index> // map_iterator_adapter
 
 #include <build/types>
+#include <build/utility>
+
 #include <build/scope>
 #include <build/variable>
 #include <build/operation>
@@ -352,7 +354,18 @@ namespace build
     const T*
     is_a () const {return dynamic_cast<const T*> (this);}
 
-    virtual const target_type& type () const = 0;
+    // An alias target type should be the same as its target type except
+    // for the name.
+    //
+    const target_type* alias_type = nullptr;
+
+    const target_type&
+    type () const
+    {
+      return alias_type != nullptr ? *alias_type : dynamic_type ();
+    }
+
+    virtual const target_type& dynamic_type () const = 0;
     static const target_type static_type;
 
   private:
@@ -897,8 +910,8 @@ namespace build
     load_mtime () const final;
 
   public:
-    virtual const target_type& type () const {return static_type;}
     static const target_type static_type;
+    virtual const target_type& dynamic_type () const {return static_type;}
   };
 
   // Alias target. It represents a list of targets (its prerequisites)
@@ -910,8 +923,8 @@ namespace build
     using target::target;
 
   public:
-    virtual const target_type& type () const {return static_type;}
     static const target_type static_type;
+    virtual const target_type& dynamic_type () const {return static_type;}
   };
 
   // Directory target. Note that this is not a filesystem directory
@@ -924,8 +937,8 @@ namespace build
     using alias::alias;
 
   public:
-    virtual const target_type& type () const {return static_type;}
     static const target_type static_type;
+    virtual const target_type& dynamic_type () const {return static_type;}
   };
 
   // While a filesystem directory is mtime-based, the semantics is
@@ -941,8 +954,8 @@ namespace build
     using target::target;
 
   public:
-    virtual const target_type& type () const {return static_type;}
     static const target_type static_type;
+    virtual const target_type& dynamic_type () const {return static_type;}
   };
 
   class buildfile: public file
@@ -951,8 +964,8 @@ namespace build
     using file::file;
 
   public:
-    virtual const target_type& type () const {return static_type;}
     static const target_type static_type;
+    virtual const target_type& dynamic_type () const {return static_type;}
   };
 
   // Common documentation file targets.
@@ -965,8 +978,8 @@ namespace build
     using file::file;
 
   public:
-    virtual const target_type& type () const {return static_type;}
     static const target_type static_type;
+    virtual const target_type& dynamic_type () const {return static_type;}
   };
 
   // The problem with man pages is this: different platforms have
@@ -1009,8 +1022,8 @@ namespace build
     using doc::doc;
 
   public:
-    virtual const target_type& type () const {return static_type;}
     static const target_type static_type;
+    virtual const target_type& dynamic_type () const {return static_type;}
   };
 
   class man1: public man
@@ -1019,8 +1032,8 @@ namespace build
     using man::man;
 
   public:
-    virtual const target_type& type () const {return static_type;}
     static const target_type static_type;
+    virtual const target_type& dynamic_type () const {return static_type;}
   };
 
   // Common implementation of the target factory, extension, and
@@ -1028,9 +1041,9 @@ namespace build
   //
   template <typename T>
   target*
-  target_factory (dir_path d, std::string n, const std::string* e)
+  target_factory (const target_type&, dir_path d, string n, const string* e)
   {
-    return new T (std::move (d), std::move (n), e);
+    return new T (move (d), move (n), e);
   }
 
   // Return fixed target extension.
diff --git a/build/target-type b/build/target-type
index 154714c..2c93455 100644
--- a/build/target-type
+++ b/build/target-type
@@ -9,7 +9,6 @@
 #include <string>
 #include <ostream>
 #include <typeindex>
-#include <functional>  // reference_wrapper
 
 #include <butl/utility> // compare_c_string
 
@@ -29,11 +28,13 @@ namespace build
     std::type_index id;
     const char* name;
     const target_type* base;
-    target* (*const factory) (dir_path, std::string, const std::string*);
-    const std::string& (*const extension) (const target_key&, scope&);
-    target* (*const search) (const prerequisite_key&);
+    target* (*factory) (const target_type&, dir_path, string, const string*);
+    const string& (*extension) (const target_key&, scope&);
+    target* (*search) (const prerequisite_key&);
     bool see_through; // A group with the default "see through" semantics.
 
+    const target_type* origin; // Original target if this is an alias.
+
     bool
     is_a (const std::type_index&) const; // Defined in target.cxx
 
@@ -56,16 +57,45 @@ namespace build
 
   // Target type map.
   //
-  using target_type_map_base = std::map<
-    const char*,
-    std::reference_wrapper<const target_type>,
-    butl::compare_c_string>;
+  struct target_type_ref
+  {
+    // Like reference_wrapper except it deletes the target type if it is
+    // an alias (aliases are always dynamically allocated).
+    //
+    explicit
+    target_type_ref (const target_type& r): p_ (&r)
+    {
+      assert (p_->origin == nullptr);
+    }
+
+    explicit
+    target_type_ref (unique_ptr<target_type>&& p): p_ (p.release ())
+    {
+      assert (p_->origin != nullptr);
+    }
+
+    ~target_type_ref ()
+    {
+      if (p_ != nullptr && p_->origin != nullptr)
+        delete p_;
+    }
+
+    explicit operator const target_type& () const {return *p_;}
+    const target_type& get () const {return *p_;}
+
+    target_type_ref (target_type_ref&& r): p_ (r.p_) {r.p_ = nullptr;}
+
+  private:
+    const target_type* p_;
+  };
+
+  using target_type_map_base = std::map<string, target_type_ref>;
 
   class target_type_map: public target_type_map_base
   {
   public:
     void
-    insert (const target_type& tt) {emplace (tt.name, tt);}
+    insert (const target_type& tt) {emplace (tt.name, target_type_ref (tt));}
 
     template <typename T>
     void
diff --git a/build/target.cxx b/build/target.cxx
index 22c9ad4..649e570 100644
--- a/build/target.cxx
+++ b/build/target.cxx
@@ -286,7 +286,7 @@ namespace build
 
     if (r)
     {
-      unique_ptr<target> pt (tt.factory (move (dir), move (name), ext));
+      unique_ptr<target> pt (tt.factory (tt, move (dir), move (name), ext));
       i = map_.emplace (
         make_pair (target_key {&tt, &pt->dir, &pt->name, &pt->ext},
                    move (pt))).first;
@@ -446,7 +446,8 @@ namespace build
     nullptr,
     nullptr,
     &search_target,
-    false
+    false,
+    nullptr
   };
 
   const target_type mtime_target::static_type
@@ -457,7 +458,8 @@ namespace build
     nullptr,
     nullptr,
     &search_target,
-    false
+    false,
+    nullptr
   };
 
   const target_type path_target::static_type
@@ -468,12 +470,13 @@ namespace build
     nullptr,
     nullptr,
     &search_target,
-    false
+    false,
+    nullptr
   };
 
   template <typename T>
   static target*
-  file_factory (dir_path d, string n, const string* e)
+  file_factory (const target_type&, dir_path d, string n, const string* e)
   {
     // The file target type doesn't imply any extension. So if one
     // wasn't specified, set it to empty rather than unspecified.
@@ -493,7 +496,8 @@ namespace build
     &file_factory<file>,
     &target_extension_fix<file_ext>,
     &search_file,
-    false
+    false,
+    nullptr
   };
 
   const target_type alias::static_type
@@ -504,7 +508,8 @@ namespace build
     &target_factory<alias>,
     nullptr, // Should never need.
     &search_alias,
-    false
+    false,
+    nullptr
   };
 
   const target_type dir::static_type
@@ -515,7 +520,8 @@ namespace build
     &target_factory<dir>,
     nullptr, // Should never need.
     &search_alias,
-    false
+    false,
+    nullptr
   };
 
   const target_type fsdir::static_type
@@ -526,7 +532,8 @@ namespace build
     &target_factory<fsdir>,
     nullptr, // Should never need.
     &search_target,
-    false
+    false,
+    nullptr
   };
 
   static const std::string&
@@ -546,7 +553,8 @@ namespace build
     &file_factory<buildfile>,
     &buildfile_target_extension,
     &search_file,
-    false
+    false,
+    nullptr
   };
 
   constexpr const char doc_ext[] = "";
@@ -558,11 +566,12 @@ namespace build
     &file_factory<doc>,
     &target_extension_fix<doc_ext>,
     &search_file,
-    false
+    false,
+    nullptr
   };
 
   static target*
-  man_factory (dir_path d, string n, const string* e)
+  man_factory (const target_type&, dir_path d, string n, const string* e)
   {
     if (e == nullptr)
       fail << "man target '" << n << "' must include extension (man section)";
@@ -578,7 +587,8 @@ namespace build
     &man_factory,
     nullptr,        // Should be specified explicitly.
     &search_file,
-    false
+    false,
+    nullptr
   };
 
   constexpr const char man1_ext[] = "1";
@@ -590,6 +600,7 @@ namespace build
     &file_factory<man1>,
     &target_extension_fix<man1_ext>,
     &search_file,
-    false
+    false,
+    nullptr
   };
 }
diff --git a/build/types b/build/types
index 0a71252..c119839 100644
--- a/build/types
+++ b/build/types
@@ -7,6 +7,8 @@
 
 #include <vector>
 #include <string>
+#include <memory>      // unique_ptr, shared_ptr
+#include <functional>  // reference_wrapper
 
 #include <butl/path>
 #include <butl/timestamp>
@@ -17,7 +19,12 @@ namespace build
 {
   // Commonly-used types.
   //
-  using strings = std::vector<std::string>;
+  using std::string;
+  using std::unique_ptr;
+  using std::shared_ptr;
+  using std::reference_wrapper;
+
+  using strings = std::vector<string>;
   using cstrings = std::vector<const char*>;
 
   // <butl/path>
diff --git a/build/utility b/build/utility
index 42d7f0f..7e6b0df 100644
--- a/build/utility
+++ b/build/utility
@@ -7,7 +7,7 @@
 
 #include <tuple>
 #include <string>
-#include <utility>
+#include <utility> // move()
 #include <exception>
 #include <unordered_set>
 
@@ -15,6 +15,8 @@
 
 namespace build
 {
+  using std::move;
+
   // Empty string and path.
   //
   extern const std::string empty_string;