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diff --git a/libbuild2/bin/target.hxx b/libbuild2/bin/target.hxx
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+// file      : libbuild2/bin/target.hxx -*- C++ -*-
+// copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
+// license   : MIT; see accompanying LICENSE file
+
+#ifndef LIBBUILD2_BIN_TARGET_HXX
+#define LIBBUILD2_BIN_TARGET_HXX
+
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
+
+#include <libbuild2/target.hxx>
+
+#include <libbuild2/bin/export.hxx>
+
+namespace build2
+{
+  namespace bin
+  {
+    // The obj{} target group.
+    //
+    // Common base of all objX{} object files.
+    //
+    class LIBBUILD2_BIN_SYMEXPORT objx: public file
+    {
+    public:
+      using file::file;
+
+    public:
+      static const target_type static_type;
+    };
+
+    class LIBBUILD2_BIN_SYMEXPORT obje: public objx
+    {
+    public:
+      using objx::objx;
+
+    public:
+      static const target_type static_type;
+      virtual const target_type& dynamic_type () const {return static_type;}
+    };
+
+    class LIBBUILD2_BIN_SYMEXPORT obja: public objx
+    {
+    public:
+      using objx::objx;
+
+    public:
+      static const target_type static_type;
+      virtual const target_type& dynamic_type () const {return static_type;}
+    };
+
+    class LIBBUILD2_BIN_SYMEXPORT objs: public objx
+    {
+    public:
+      using objx::objx;
+
+    public:
+      static const target_type static_type;
+      virtual const target_type& dynamic_type () const {return static_type;}
+    };
+
+    class LIBBUILD2_BIN_SYMEXPORT obj: public target
+    {
+    public:
+      using target::target;
+
+    public:
+      static const target_type static_type;
+      virtual const target_type& dynamic_type () const {return static_type;}
+    };
+
+    // Binary module interface (BMI).
+    //
+    // While currently there are only C++ modules, if things pan out, chances
+    // are we will have C (or Obj-C) modules. And in that case it is plausible
+    // we will also have some binutils to examine BMIs, similar to objdump,
+    // etc. So that's why this target type is in bin and not cxx.
+    //
+    // bmi*{} is similar to obj*{} though the semantics is a bit different:
+    // the idea is that we should try hard to re-use a single bmiX{} file for
+    // an entire "build" but if that's not possible (because the compilation
+    // options are too different), then compile a private version for
+    // ourselves (the definition of "too different" is, of course, compiler-
+    // specific).
+    //
+    // When we compile a module interface unit, we end up with bmi*{} and
+    // obj*{}. How that obj*{} is produced is compiler-dependent. While it
+    // makes sense to decouple the production of the two in order to increase
+    // parallelism, doing so will further complicate the already hairy
+    // organization. So, at least for now, we produce the two at the same time
+    // and make obj*{} an ad hoc member of bmi*{}.
+    //
+    // There are also header units for which we define a parallel hbmi*{}
+    // hierarchy. Note that hbmix{} is-a bmix{} (we think of header BMIs as a
+    // more specialized kind of BMI) so where you need to distinguish between
+    // header and module BMIs, you should check for headers first. Note also
+    // that in case of a header unit there may be no obj*{}.
+    //
+    // Common base of all bmiX{} interface files.
+    //
+    class LIBBUILD2_BIN_SYMEXPORT bmix: public file
+    {
+    public:
+      using file::file;
+
+    public:
+      static const target_type static_type;
+    };
+
+    // Common base of all hbmiX{} interface files.
+    //
+    class LIBBUILD2_BIN_SYMEXPORT hbmix: public bmix
+    {
+    public:
+      using bmix::bmix;
+
+    public:
+      static const target_type static_type;
+    };
+
+    class LIBBUILD2_BIN_SYMEXPORT bmie: public bmix
+    {
+    public:
+      using bmix::bmix;
+
+    public:
+      static const target_type static_type;
+      virtual const target_type& dynamic_type () const {return static_type;}
+    };
+
+    class LIBBUILD2_BIN_SYMEXPORT hbmie: public hbmix
+    {
+    public:
+      using hbmix::hbmix;
+
+    public:
+      static const target_type static_type;
+      virtual const target_type& dynamic_type () const {return static_type;}
+    };
+
+    class LIBBUILD2_BIN_SYMEXPORT bmia: public bmix
+    {
+    public:
+      using bmix::bmix;
+
+    public:
+      static const target_type static_type;
+      virtual const target_type& dynamic_type () const {return static_type;}
+    };
+
+    class LIBBUILD2_BIN_SYMEXPORT hbmia: public hbmix
+    {
+    public:
+      using hbmix::hbmix;
+
+    public:
+      static const target_type static_type;
+      virtual const target_type& dynamic_type () const {return static_type;}
+    };
+
+    class LIBBUILD2_BIN_SYMEXPORT bmis: public bmix
+    {
+    public:
+      using bmix::bmix;
+
+    public:
+      static const target_type static_type;
+      virtual const target_type& dynamic_type () const {return static_type;}
+    };
+
+    class LIBBUILD2_BIN_SYMEXPORT hbmis: public hbmix
+    {
+    public:
+      using hbmix::hbmix;
+
+    public:
+      static const target_type static_type;
+      virtual const target_type& dynamic_type () const {return static_type;}
+    };
+
+    class LIBBUILD2_BIN_SYMEXPORT bmi: public target
+    {
+    public:
+      using target::target;
+
+    public:
+      static const target_type static_type;
+      virtual const target_type& dynamic_type () const {return static_type;}
+    };
+
+    class LIBBUILD2_BIN_SYMEXPORT hbmi: public target
+    {
+    public:
+      using target::target;
+
+    public:
+      static const target_type static_type;
+      virtual const target_type& dynamic_type () const {return static_type;}
+    };
+
+
+    // Common base for lib{} and libul{} groups.
+    //
+    // We use mtime_target as a base for the "trust me it exists" functionality
+    // which we use, for example, to have installed lib{} prerequisites that
+    // are matched by the fallback file rule.
+    //
+    class LIBBUILD2_BIN_SYMEXPORT libx: public mtime_target
+    {
+    public:
+      using mtime_target::mtime_target;
+
+    public:
+      static const target_type static_type;
+    };
+
+    // The libue{} target, libul{} group and libua{} and libus{} members
+    // (utility library).
+    //
+    // Utility libraries are static libraries that differ based on the kind of
+    // object files they contains. Note that the libul{} group is more like
+    // obj{} rather than lib{} in that one does not build the group directly
+    // rather picking a suitable member.
+    //
+    // libul{} is a "library utility library" in that the choice of members is
+    // libua{} or libus{}, even when linking an executable (normally a unit
+    // test).
+    //
+    // Note that there is no "general utility library" with all three types of
+    // members (that would cause member uplink ambiguity). If you need to
+    // build both a library from libua{}/libus{} and an executable from
+    // libue{} then you will need to arrange this explicitly, for example:
+    //
+    // exe{foo}: libue{foo}
+    // lib{foo}: libul{foo}
+    //
+    // {libue libul}{foo}: cxx{*}
+    //
+    // Common base of all libuX{} static libraries.
+    //
+    class LIBBUILD2_BIN_SYMEXPORT libux: public file
+    {
+    public:
+      using file::file;
+
+    public:
+      static const target_type static_type;
+    };
+
+    class LIBBUILD2_BIN_SYMEXPORT libue: public libux
+    {
+    public:
+      using libux::libux;
+
+    public:
+      static const target_type static_type;
+      virtual const target_type& dynamic_type () const {return static_type;}
+    };
+
+    class LIBBUILD2_BIN_SYMEXPORT libua: public libux
+    {
+    public:
+      using libux::libux;
+
+    public:
+      static const target_type static_type;
+      virtual const target_type& dynamic_type () const {return static_type;}
+    };
+
+    class LIBBUILD2_BIN_SYMEXPORT libus: public libux
+    {
+    public:
+      using libux::libux;
+
+    public:
+      static const target_type static_type;
+      virtual const target_type& dynamic_type () const {return static_type;}
+    };
+
+    class LIBBUILD2_BIN_SYMEXPORT libul: public libx
+    {
+    public:
+      using libx::libx;
+
+    public:
+      static const target_type static_type;
+      virtual const target_type& dynamic_type () const {return static_type;}
+    };
+
+    // The lib{} target group.
+    //
+    class LIBBUILD2_BIN_SYMEXPORT liba: public file
+    {
+    public:
+      using file::file;
+
+    public:
+      static const target_type static_type;
+      virtual const target_type& dynamic_type () const {return static_type;}
+    };
+
+    class LIBBUILD2_BIN_SYMEXPORT libs: public file
+    {
+    public:
+      using file::file;
+
+    public:
+      static const target_type static_type;
+
+      virtual const target_type&
+      dynamic_type () const override {return static_type;}
+    };
+
+    // Standard layout type compatible with group_view's const target*[2].
+    //
+    struct lib_members
+    {
+      const liba* a = nullptr;
+      const libs* s = nullptr;
+    };
+
+    class LIBBUILD2_BIN_SYMEXPORT lib: public libx, public lib_members
+    {
+    public:
+      using libx::libx;
+
+      virtual group_view
+      group_members (action) const override;
+
+    public:
+      static const target_type static_type;
+
+      virtual const target_type&
+      dynamic_type () const override {return static_type;}
+    };
+
+    // Windows import library.
+    //
+    class LIBBUILD2_BIN_SYMEXPORT libi: public file
+    {
+    public:
+      using file::file;
+
+    public:
+      static const target_type static_type;
+      virtual const target_type& dynamic_type () const {return static_type;}
+    };
+
+    // Windows module definition (.def).
+    //
+    class LIBBUILD2_BIN_SYMEXPORT def: public file
+    {
+    public:
+      using file::file;
+
+    public:
+      static const target_type static_type;
+      virtual const target_type& dynamic_type () const {return static_type;}
+    };
+  }
+}
+
+#endif // LIBBUILD2_BIN_TARGET_HXX