Move bin build system module to separate library

1 files changed, 963 insertions, 0 deletions

diff --git a/libbuild2/bin/init.cxx b/libbuild2/bin/init.cxx
new file mode 100644
index 0000000..d56e0a5
--- /dev/null
+++ b/libbuild2/bin/init.cxx
@@ -0,0 +1,963 @@
+// file      : build2/bin/init.cxx -*- C++ -*-
+// copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
+// license   : MIT; see accompanying LICENSE file
+
+#include <libbuild2/bin/init.hxx>
+
+#include <map>
+
+#include <libbuild2/scope.hxx>
+#include <libbuild2/variable.hxx>
+#include <libbuild2/diagnostics.hxx>
+
+#include <libbuild2/config/utility.hxx>
+
+#include <libbuild2/test/module.hxx>
+
+#include <libbuild2/install/rule.hxx>
+#include <libbuild2/install/utility.hxx>
+
+#include <libbuild2/bin/rule.hxx>
+#include <libbuild2/bin/guess.hxx>
+#include <libbuild2/bin/target.hxx>
+
+using namespace std;
+using namespace butl;
+
+namespace build2
+{
+  namespace bin
+  {
+    static const fail_rule fail_;
+    static const lib_rule lib_;
+
+    // Default config.bin.*.lib values.
+    //
+    static const strings exe_lib {"shared", "static"};
+    static const strings liba_lib {"static", "shared"};
+    static const strings libs_lib {"shared", "static"};
+
+    bool
+    vars_init (scope& rs,
+               scope&,
+               const location&,
+               unique_ptr<module_base>&,
+               bool first,
+               bool,
+               const variable_map&)
+    {
+      tracer trace ("bin::vars_init");
+      l5 ([&]{trace << "for " << rs;});
+
+      assert (first);
+
+      // Enter variables. Note: some overridable, some not.
+      //
+      // Target is a string and not target_triplet because it can be
+      // specified by the user.
+      //
+      auto& vp (rs.ctx.var_pool.rw (rs));
+
+      vp.insert<string>    ("config.bin.target",   true);
+      vp.insert<string>    ("config.bin.pattern",  true);
+
+      // Library types to build.
+      //
+      vp.insert<string>    ("config.bin.lib",      true);
+
+      // Library types to use (in priority order).
+      //
+      vp.insert<strings>   ("config.bin.exe.lib",  true);
+      vp.insert<strings>   ("config.bin.liba.lib", true);
+      vp.insert<strings>   ("config.bin.libs.lib", true);
+
+      // The rpath[_link].auto flag controls automatic rpath behavior, for
+      // example, addition of rpaths for prerequisite libraries (see the cc
+      // module for an example). Default is true.
+      //
+      vp.insert<dir_paths> ("config.bin.rpath",      true);
+      vp.insert<bool>      ("config.bin.rpath.auto", true);
+
+      vp.insert<dir_paths> ("config.bin.rpath_link",      true);
+      vp.insert<bool>      ("config.bin.rpath_link.auto", true);
+
+      vp.insert<string>    ("config.bin.prefix", true);
+      vp.insert<string>    ("config.bin.suffix", true);
+      vp.insert<string>    ("config.bin.lib.prefix", true);
+      vp.insert<string>    ("config.bin.lib.suffix", true);
+      vp.insert<string>    ("config.bin.exe.prefix", true);
+      vp.insert<string>    ("config.bin.exe.suffix", true);
+
+      vp.insert<string>    ("bin.lib");
+
+      vp.insert<strings>   ("bin.exe.lib");
+      vp.insert<strings>   ("bin.liba.lib");
+      vp.insert<strings>   ("bin.libs.lib");
+
+      vp.insert<dir_paths> ("bin.rpath");
+      vp.insert<bool>      ("bin.rpath.auto");
+
+      vp.insert<dir_paths> ("bin.rpath_link");
+      vp.insert<bool>      ("bin.rpath_link.auto");
+
+      // Link whole archive. Note: non-overridable with target visibility.
+      //
+      // The lookup semantics is as follows: we first look for a prerequisite-
+      // specific value, then for a target-specific value in the library being
+      // linked, and then for target type/pattern-specific value starting from
+      // the scope of the target being linked-to. In that final lookup we do
+      // not look in the target being linked-to itself since that is used to
+      // indicate how this target should be linked to other targets. For
+      // example:
+      //
+      // exe{test}: liba{foo}
+      // liba{foo}: libua{foo1 foo2}
+      // liba{foo}: bin.whole = false # Affects test but not foo1 and foo2.
+      //
+      // If unspecified, defaults to false for liba{} and to true for libu*{}.
+      //
+      vp.insert<bool>      ("bin.whole", false, variable_visibility::target);
+
+      vp.insert<string>    ("bin.exe.prefix");
+      vp.insert<string>    ("bin.exe.suffix");
+      vp.insert<string>    ("bin.lib.prefix");
+      vp.insert<string>    ("bin.lib.suffix");
+
+      vp.insert<string>    ("bin.lib.load_suffix",
+                            variable_visibility::project);
+
+      vp.insert<map<string, string>> ("bin.lib.version",
+                                      variable_visibility::project);
+
+      return true;
+    }
+
+    bool
+    config_init (scope& rs,
+                 scope& bs,
+                 const location& loc,
+                 unique_ptr<module_base>&,
+                 bool first,
+                 bool,
+                 const variable_map& hints)
+    {
+      tracer trace ("bin::config_init");
+      l5 ([&]{trace << "for " << bs;});
+
+      // We only support root loading (which means there can only be one).
+      //
+      if (&rs != &bs)
+        fail (loc) << "bin.config module must be loaded in project root";
+
+      // Load bin.vars.
+      //
+      if (!cast_false<bool> (rs["bin.vars.loaded"]))
+        load_module (rs, rs, "bin.vars", loc);
+
+      // Configure.
+      //
+      using config::required;
+      using config::optional;
+      using config::omitted;
+
+      // Adjust module priority (binutils).
+      //
+      config::save_module (rs, "bin", 350);
+
+      // The idea here is as follows: if we already have one of
+      // the bin.* variables set, then we assume this is static
+      // project configuration and don't bother setting the
+      // corresponding config.bin.* variable.
+      //
+      //@@ Need to validate the values. Would be more efficient
+      //   to do it once on assignment than every time on query.
+      //   Custom var type?
+      //
+
+      // config.bin.lib
+      //
+      {
+        value& v (rs.assign ("bin.lib"));
+        if (!v)
+          v = *required (rs, "config.bin.lib", "both").first;
+      }
+
+      // config.bin.exe.lib
+      //
+      {
+        value& v (rs.assign ("bin.exe.lib"));
+        if (!v)
+          v = *required (rs, "config.bin.exe.lib", exe_lib).first;
+      }
+
+      // config.bin.liba.lib
+      //
+      {
+        value& v (rs.assign ("bin.liba.lib"));
+        if (!v)
+          v = *required (rs, "config.bin.liba.lib", liba_lib).first;
+      }
+
+      // config.bin.libs.lib
+      //
+      {
+        value& v (rs.assign ("bin.libs.lib"));
+        if (!v)
+          v = *required (rs, "config.bin.libs.lib", libs_lib).first;
+      }
+
+      // config.bin.rpath[_link]
+      //
+      // These ones are optional and we merge them into bin.rpath[_link], if
+      // any.
+      //
+      rs.assign ("bin.rpath") += cast_null<dir_paths> (
+        optional (rs, "config.bin.rpath"));
+
+      rs.assign ("bin.rpath_link") += cast_null<dir_paths> (
+        optional (rs, "config.bin.rpath_link"));
+
+      // config.bin.rpath[_link].auto
+      //
+      {
+        lookup l;
+
+        rs.assign ("bin.rpath.auto") =
+          (l = omitted (rs, "config.bin.rpath.auto").first)
+          ? cast<bool> (l)
+          : true;
+
+        rs.assign ("bin.rpath_link.auto") =
+          (l = omitted (rs, "config.bin.rpath_link.auto").first)
+          ? cast<bool> (l)
+          : true;
+      }
+
+      // config.bin.{lib,exe}.{prefix,suffix}
+      //
+      // These ones are not used very often so we will omit them from the
+      // config.build if not specified. We also override any existing value
+      // that might have been specified before loading the module.
+      //
+      {
+        lookup p (omitted (rs, "config.bin.prefix").first);
+        lookup s (omitted (rs, "config.bin.suffix").first);
+
+        auto set = [&rs] (const char* bv, const char* cv, lookup l)
+        {
+          if (lookup o = omitted (rs, cv).first)
+            l = o;
+
+          if (l)
+            rs.assign (bv) = *l;
+        };
+
+        set ("bin.lib.prefix", "config.bin.lib.prefix", p);
+        set ("bin.lib.suffix", "config.bin.lib.suffix", s);
+
+        set ("bin.exe.prefix", "config.bin.exe.prefix", p);
+        set ("bin.exe.suffix", "config.bin.exe.suffix", s);
+      }
+
+      if (first)
+      {
+        bool new_val (false); // Set any new values?
+
+        // config.bin.target
+        //
+        {
+          const variable& var (rs.ctx.var_pool["config.bin.target"]);
+
+          // We first see if the value was specified via the configuration
+          // mechanism.
+          //
+          auto p (omitted (rs, var));
+          lookup l (p.first);
+
+          // Then see if there is a config hint (e.g., from the cc module).
+          //
+          bool hint (false);
+          if (!l)
+          {
+            if (auto hl = hints[var])
+            {
+              l = hl;
+              hint = true;
+            }
+          }
+
+          if (!l)
+            fail (loc) << "unable to determine binutils target" <<
+              info << "consider specifying it with " << var <<
+              info << "or first load a module that can provide it as a hint, "
+                       << "such as c or cxx";
+
+          // Split/canonicalize the target.
+          //
+          string s (cast<string> (l));
+
+          // Did the user ask us to use config.sub? If this is a hinted value,
+          // then we assume it has already been passed through config.sub.
+          //
+          if (!hint && config_sub)
+          {
+            s = run<string> (3,
+                             *config_sub,
+                             s.c_str (),
+                             [] (string& l, bool) {return move (l);});
+            l5 ([&]{trace << "config.sub target: '" << s << "'";});
+          }
+
+          try
+          {
+            target_triplet t (s);
+
+            l5 ([&]{trace << "canonical target: '" << t.string () << "'; "
+                          << "class: " << t.class_;});
+
+            assert (!hint || s == t.string ());
+
+            // Also enter as bin.target.{cpu,vendor,system,version,class}
+            // for convenience of access.
+            //
+            rs.assign<string> ("bin.target.cpu")     = t.cpu;
+            rs.assign<string> ("bin.target.vendor")  = t.vendor;
+            rs.assign<string> ("bin.target.system")  = t.system;
+            rs.assign<string> ("bin.target.version") = t.version;
+            rs.assign<string> ("bin.target.class")   = t.class_;
+
+            rs.assign<target_triplet> ("bin.target") = move (t);
+          }
+          catch (const invalid_argument& e)
+          {
+            // This is where we suggest that the user specifies --config-sub
+            // to help us out.
+            //
+            fail << "unable to parse binutils target '" << s << "': " << e <<
+              info << "consider using the --config-sub option";
+          }
+
+          new_val = new_val || p.second; // False for a hinted value.
+        }
+
+        // config.bin.pattern
+        //
+        {
+          const variable& var (rs.ctx.var_pool["config.bin.pattern"]);
+
+          // We first see if the value was specified via the configuration
+          // mechanism.
+          //
+          auto p (omitted (rs, var));
+          lookup l (p.first);
+
+          // Then see if there is a config hint (e.g., from the C++ module).
+          //
+          if (!l)
+          {
+            if (auto hl = hints[var])
+              l = hl;
+          }
+
+          // For ease of use enter it as bin.pattern (since it can come from
+          // different places).
+          //
+          if (l)
+          {
+            const string& s (cast<string> (l));
+
+            if (s.empty () ||
+                (!path::traits_type::is_separator (s.back ()) &&
+                 s.find ('*') == string::npos))
+            {
+              fail << "missing '*' in binutils pattern '" << s << "'";
+            }
+
+            rs.assign<string> ("bin.pattern") = s;
+            new_val = new_val || p.second; // False for a hinted value.
+          }
+        }
+
+        // If we set any new values (e.g., we are configuring), then print the
+        // report at verbosity level 2 and up (-v).
+        //
+        if (verb >= (new_val ? 2 : 3))
+        {
+          diag_record dr (text);
+
+          dr << "bin " << project (rs) << '@' << rs << '\n'
+             << "  target     " << cast<target_triplet> (rs["bin.target"]);
+
+          if (auto l = rs["bin.pattern"])
+            dr << '\n'
+               << "  pattern    " << cast<string> (l);
+        }
+      }
+
+      return true;
+    }
+
+    bool
+    init (scope& rs,
+          scope& bs,
+          const location& loc,
+          unique_ptr<module_base>&,
+          bool first,
+          bool,
+          const variable_map& hints)
+    {
+      tracer trace ("bin::init");
+      l5 ([&]{trace << "for " << bs;});
+
+      // Load bin.config.
+      //
+      if (!cast_false<bool> (rs["bin.config.loaded"]))
+        load_module (rs, rs, "bin.config", loc, false, hints);
+
+      // Cache some config values we will be needing below.
+      //
+      const string& tclass (cast<string> (rs["bin.target.class"]));
+
+      // Register target types and configure their default "installability".
+      //
+      bool install_loaded (cast_false<bool> (rs["install.loaded"]));
+      {
+        using namespace install;
+
+        if (first)
+        {
+          rs.insert_target_type<obj>  ();
+          rs.insert_target_type<obje> ();
+          rs.insert_target_type<obja> ();
+          rs.insert_target_type<objs> ();
+
+          rs.insert_target_type<bmi>  ();
+          rs.insert_target_type<bmie> ();
+          rs.insert_target_type<bmia> ();
+          rs.insert_target_type<bmis> ();
+
+          rs.insert_target_type<hbmi>  ();
+          rs.insert_target_type<hbmie> ();
+          rs.insert_target_type<hbmia> ();
+          rs.insert_target_type<hbmis> ();
+
+          rs.insert_target_type<libul> ();
+          rs.insert_target_type<libue> ();
+          rs.insert_target_type<libua> ();
+          rs.insert_target_type<libus> ();
+
+          rs.insert_target_type<lib>  ();
+          rs.insert_target_type<liba> ();
+          rs.insert_target_type<libs> ();
+
+          // Register the def{} target type. Note that we do it here since it
+          // is input and can be specified unconditionally (i.e., not only
+          // when building for Windows).
+          //
+          rs.insert_target_type<def> ();
+        }
+
+        // Note: libu*{} members are not installable.
+        //
+        if (install_loaded)
+        {
+          install_path<liba> (bs, dir_path ("lib")); // Install in install.lib.
+          install_mode<liba> (bs, "644");
+        }
+
+        // Should shared libraries have the executable bit? That depends on
+        // who you ask. In Debian, for example, it should not unless, it
+        // really is executable (i.e., has main()). On the other hand, on
+        // some systems, this may be required in order for the dynamic
+        // linker to be able to load the library. So, by default, we will
+        // keep it executable, especially seeing that this is also the
+        // behavior of autotools. At the same time, it is easy to override
+        // this, for example:
+        //
+        // config.install.lib.mode=644
+        //
+        // And a library that wants to override any such overrides (e.g.,
+        // because it does have main()) can do:
+        //
+        // libs{foo}: install.mode=755
+        //
+        // Everyone is happy then? On Windows libs{} is the DLL and goes to
+        // bin/, not lib/.
+        //
+        if (install_loaded)
+          install_path<libs> (bs,
+                              dir_path (tclass == "windows" ? "bin" : "lib"));
+
+        // Create additional target types for certain targets.
+        //
+        if (tclass == "windows")
+        {
+          // Import library.
+          //
+          if (first)
+            rs.insert_target_type<libi> ();
+
+          if (install_loaded)
+          {
+            install_path<libi> (bs, dir_path ("lib"));
+            install_mode<libi> (bs, "644");
+          }
+        }
+      }
+
+      // Register rules.
+      //
+      {
+        auto& r (bs.rules);
+
+        r.insert<obj> (perform_update_id, "bin.obj", fail_);
+        r.insert<obj> (perform_clean_id,  "bin.obj", fail_);
+
+        r.insert<bmi> (perform_update_id, "bin.bmi", fail_);
+        r.insert<bmi> (perform_clean_id,  "bin.bmi", fail_);
+
+        r.insert<hbmi> (perform_update_id, "bin.hbmi", fail_);
+        r.insert<hbmi> (perform_clean_id,  "bin.hbmi", fail_);
+
+        r.insert<libul> (perform_update_id, "bin.libul", fail_);
+        r.insert<libul> (perform_clean_id,  "bin.libul", fail_);
+
+        // Similar to alias.
+        //
+
+        //@@ outer
+        r.insert<lib> (perform_id, 0, "bin.lib", lib_);
+        r.insert<lib> (configure_id, 0, "bin.lib", lib_);
+
+        // Treat as a see through group for install and test.
+        //
+        if (install_loaded)
+        {
+          auto& gr (install::group_rule::instance);
+
+          r.insert<lib> (perform_install_id, "bin.lib", gr);
+          r.insert<lib> (perform_uninstall_id, "bin.lib", gr);
+        }
+
+        if (const test::module* m = rs.lookup_module<test::module> ("test"))
+        {
+          r.insert<lib> (perform_test_id, "bin.lib", m->group_rule ());
+        }
+      }
+
+      return true;
+    }
+
+    bool
+    ar_config_init (scope& rs,
+                    scope& bs,
+                    const location& loc,
+                    unique_ptr<module_base>&,
+                    bool first,
+                    bool,
+                    const variable_map& hints)
+    {
+      tracer trace ("bin::ar_config_init");
+      l5 ([&]{trace << "for " << bs;});
+
+      // Make sure bin.config is loaded.
+      //
+      if (!cast_false<bool> (rs["bin.config.loaded"]))
+        load_module (rs, bs, "bin.config", loc, false, hints);
+
+      // Enter configuration variables.
+      //
+      if (first)
+      {
+        auto& v (rs.ctx.var_pool.rw (rs));
+
+        v.insert<process_path> ("bin.ar.path");
+        v.insert<process_path> ("bin.ranlib.path");
+
+        v.insert<path>         ("config.bin.ar", true);
+        v.insert<path>         ("config.bin.ranlib", true);
+      }
+
+      // Configure.
+      //
+      if (first)
+      {
+        // config.bin.ar
+        // config.bin.ranlib
+        //
+        // For config.bin.ar we have the default (plus the pattern) while
+        // ranlib should be explicitly specified by the user in order for us
+        // to use it (all targets that we currently care to support have the
+        // ar -s option but if that changes we can always force the use of
+        // ranlib for certain targets).
+        //
+        // Another idea is to refuse to use default 'ar' (without the pattern)
+        // if the host/build targets don't match. On the other hand, a cross-
+        // toolchain can be target-unprefixed. Also, without canonicalization,
+        // comparing targets will be unreliable.
+        //
+
+        // Use the target to decide on the default binutils program names.
+        //
+        const string& tsys (cast<string> (rs["bin.target.system"]));
+        const char* ar_d (tsys == "win32-msvc" ? "lib" : "ar");
+
+        // This can be either a pattern or a fallback search directory.
+        //
+        const string* pat (cast_null<string> (rs["bin.pattern"]));
+
+        bool fb (pat != nullptr &&
+                 path::traits_type::is_separator (pat->back ()));
+
+        // Don't save the default value to config.build so that if the user
+        // changes, say, the C++ compiler (which hinted the pattern), then
+        // ar will automatically change as well.
+        //
+        auto ap (
+          config::required (
+            rs,
+            "config.bin.ar",
+            path (apply_pattern (ar_d, fb ? nullptr : pat)),
+            false,
+            config::save_commented));
+
+        auto rp (
+          config::required (
+            rs,
+            "config.bin.ranlib",
+            nullptr,
+            false,
+            config::save_commented));
+
+        const path& ar (cast<path> (ap.first));
+        const path* ranlib (cast_null<path> (rp.first));
+
+        ar_info ari (
+          guess_ar (ar, ranlib, fb ? dir_path (*pat) : dir_path ()));
+
+        // If this is a new value (e.g., we are configuring), then print the
+        // report at verbosity level 2 and up (-v).
+        //
+        if (verb >= (ap.second || rp.second ? 2 : 3))
+        {
+          diag_record dr (text);
+
+          {
+            dr << "bin.ar " << project (rs) << '@' << rs << '\n'
+               << "  ar         " << ari.ar_path << '\n'
+               << "  id         " << ari.ar_id << '\n'
+               << "  version    " << ari.ar_version.string () << '\n'
+               << "  major      " << ari.ar_version.major << '\n'
+               << "  minor      " << ari.ar_version.minor << '\n'
+               << "  patch      " << ari.ar_version.patch << '\n';
+          }
+
+          if (!ari.ar_version.build.empty ())
+          {
+            dr << "  build      " << ari.ar_version.build << '\n';
+          }
+
+          {
+            dr << "  signature  " << ari.ar_signature << '\n'
+               << "  checksum   " << ari.ar_checksum;
+          }
+
+          if (ranlib != nullptr)
+          {
+            dr << '\n'
+               << "  ranlib     " << ari.ranlib_path << '\n'
+               << "  id         " << ari.ranlib_id << '\n'
+               << "  signature  " << ari.ranlib_signature << '\n'
+               << "  checksum   " << ari.ranlib_checksum;
+          }
+        }
+
+        rs.assign<process_path> ("bin.ar.path")      = move (ari.ar_path);
+        rs.assign<string>       ("bin.ar.id")        = move (ari.ar_id);
+        rs.assign<string>       ("bin.ar.signature") = move (ari.ar_signature);
+        rs.assign<string>       ("bin.ar.checksum")  = move (ari.ar_checksum);
+
+        {
+          semantic_version& v (ari.ar_version);
+
+          rs.assign<string>   ("bin.ar.version")       = v.string ();
+          rs.assign<uint64_t> ("bin.ar.version.major") = v.major;
+          rs.assign<uint64_t> ("bin.ar.version.minor") = v.minor;
+          rs.assign<uint64_t> ("bin.ar.version.patch") = v.patch;
+          rs.assign<string>   ("bin.ar.version.build") = move (v.build);
+        }
+
+        if (ranlib != nullptr)
+        {
+          rs.assign<process_path> ("bin.ranlib.path") = move (ari.ranlib_path);
+          rs.assign<string>       ("bin.ranlib.id")   = move (ari.ranlib_id);
+          rs.assign<string>       ("bin.ranlib.signature") =
+            move (ari.ranlib_signature);
+          rs.assign<string>       ("bin.ranlib.checksum") =
+            move (ari.ranlib_checksum);
+        }
+      }
+
+      return true;
+    }
+
+    bool
+    ar_init (scope& rs,
+             scope& bs,
+             const location& loc,
+             unique_ptr<module_base>&,
+             bool,
+             bool,
+             const variable_map& hints)
+    {
+      tracer trace ("bin::ar_init");
+      l5 ([&]{trace << "for " << bs;});
+
+      // Make sure the bin core and ar.config are loaded.
+      //
+      if (!cast_false<bool> (bs["bin.loaded"]))
+        load_module (rs, bs, "bin", loc, false, hints);
+
+      if (!cast_false<bool> (bs["bin.ar.config.loaded"]))
+        load_module (rs, bs, "bin.ar.config", loc, false, hints);
+
+      return true;
+    }
+
+    bool
+    ld_config_init (scope& rs,
+                    scope& bs,
+                    const location& loc,
+                    unique_ptr<module_base>&,
+                    bool first,
+                    bool,
+                    const variable_map& hints)
+    {
+      tracer trace ("bin::ld_config_init");
+      l5 ([&]{trace << "for " << bs;});
+
+      // Make sure bin.config is loaded.
+      //
+      if (!cast_false<bool> (rs["bin.config.loaded"]))
+        load_module (rs, rs, "bin.config", loc, false, hints);
+
+      // Enter configuration variables.
+      //
+      if (first)
+      {
+        auto& v (rs.ctx.var_pool.rw (rs));
+
+        v.insert<process_path> ("bin.ld.path");
+        v.insert<path>         ("config.bin.ld", true);
+      }
+
+      // Configure.
+      //
+      if (first)
+      {
+        // config.bin.ld
+        //
+        // Use the target to decide on the default ld name.
+        //
+        const string& tsys (cast<string> (rs["bin.target.system"]));
+        const char* ld_d (tsys == "win32-msvc" ? "link" : "ld");
+
+        // This can be either a pattern or a fallback search directory.
+        //
+        const string* pat (cast_null<string> (rs["bin.pattern"]));
+
+        bool fb (pat != nullptr &&
+                 path::traits_type::is_separator (pat->back ()));
+
+        auto p (
+          config::required (
+            rs,
+            "config.bin.ld",
+            path (apply_pattern (ld_d, fb ? nullptr : pat)),
+            false,
+            config::save_commented));
+
+        const path& ld (cast<path> (p.first));
+        ld_info ldi (guess_ld (ld, fb ? dir_path (*pat) : dir_path ()));
+
+        // If this is a new value (e.g., we are configuring), then print the
+        // report at verbosity level 2 and up (-v).
+        //
+        if (verb >= (p.second ? 2 : 3))
+        {
+          text << "bin.ld " << project (rs) << '@' << rs << '\n'
+               << "  ld         " << ldi.path << '\n'
+               << "  id         " << ldi.id << '\n'
+               << "  signature  " << ldi.signature << '\n'
+               << "  checksum   " << ldi.checksum;
+        }
+
+        rs.assign<process_path> ("bin.ld.path")      = move (ldi.path);
+        rs.assign<string>       ("bin.ld.id")        = move (ldi.id);
+        rs.assign<string>       ("bin.ld.signature") = move (ldi.signature);
+        rs.assign<string>       ("bin.ld.checksum")  = move (ldi.checksum);
+      }
+
+      return true;
+    }
+
+    bool
+    ld_init (scope& rs,
+             scope& bs,
+             const location& loc,
+             unique_ptr<module_base>&,
+             bool,
+             bool,
+             const variable_map& hints)
+    {
+      tracer trace ("bin::ld_init");
+      l5 ([&]{trace << "for " << bs;});
+
+      // Make sure the bin core and ld.config are loaded.
+      //
+      if (!cast_false<bool> (bs["bin.loaded"]))
+        load_module (rs, bs, "bin", loc, false, hints);
+
+      if (!cast_false<bool> (bs["bin.ld.config.loaded"]))
+        load_module (rs, bs, "bin.ld.config", loc, false, hints);
+
+      const string& lid (cast<string> (rs["bin.ld.id"]));
+
+      // Register the pdb{} target if using the VC toolchain.
+      //
+      using namespace install;
+
+      if (lid == "msvc")
+      {
+        const target_type& pdb (bs.derive_target_type<file> ("pdb").first);
+        install_path (bs, pdb, dir_path ("bin")); // Goes to install.bin
+        install_mode (bs, pdb, "644");            // But not executable.
+      }
+
+      return true;
+    }
+
+    bool
+    rc_config_init (scope& rs,
+                    scope& bs,
+                    const location& loc,
+                    unique_ptr<module_base>&,
+                    bool first,
+                    bool,
+                    const variable_map& hints)
+    {
+      tracer trace ("bin::rc_config_init");
+      l5 ([&]{trace << "for " << bs;});
+
+      // Make sure bin.config is loaded.
+      //
+      if (!cast_false<bool> (bs["bin.config.loaded"]))
+        load_module (rs, bs, "bin.config", loc, false, hints);
+
+      // Enter configuration variables.
+      //
+      if (first)
+      {
+        auto& v (rs.ctx.var_pool.rw (rs));
+
+        v.insert<process_path> ("bin.rc.path");
+        v.insert<path>         ("config.bin.rc", true);
+      }
+
+      // Configure.
+      //
+      if (first)
+      {
+        // config.bin.rc
+        //
+        // Use the target to decide on the default rc name.
+        //
+        const string& tsys (cast<string> (rs["bin.target.system"]));
+        const char* rc_d (tsys == "win32-msvc" ? "rc" : "windres");
+
+        // This can be either a pattern or a fallback search directory.
+        //
+        const string* pat (cast_null<string> (rs["bin.pattern"]));
+
+        bool fb (pat != nullptr &&
+                 path::traits_type::is_separator (pat->back ()));
+
+        auto p (
+          config::required (
+            rs,
+            "config.bin.rc",
+            path (apply_pattern (rc_d, fb ? nullptr : pat)),
+            false,
+            config::save_commented));
+
+        const path& rc (cast<path> (p.first));
+        rc_info rci (guess_rc (rc, fb ? dir_path (*pat) : dir_path ()));
+
+        // If this is a new value (e.g., we are configuring), then print the
+        // report at verbosity level 2 and up (-v).
+        //
+        if (verb >= (p.second ? 2 : 3))
+        {
+          text << "bin.rc " << project (rs) << '@' << rs << '\n'
+               << "  rc         " << rci.path << '\n'
+               << "  id         " << rci.id << '\n'
+               << "  signature  " << rci.signature << '\n'
+               << "  checksum   " << rci.checksum;
+        }
+
+        rs.assign<process_path> ("bin.rc.path")      = move (rci.path);
+        rs.assign<string>       ("bin.rc.id")        = move (rci.id);
+        rs.assign<string>       ("bin.rc.signature") = move (rci.signature);
+        rs.assign<string>       ("bin.rc.checksum")  = move (rci.checksum);
+      }
+
+      return true;
+    }
+
+    bool
+    rc_init (scope& rs,
+             scope& bs,
+             const location& loc,
+             unique_ptr<module_base>&,
+             bool,
+             bool,
+             const variable_map& hints)
+    {
+      tracer trace ("bin::rc_init");
+      l5 ([&]{trace << "for " << bs;});
+
+      // Make sure the bin core and rc.config are loaded.
+      //
+      if (!cast_false<bool> (bs["bin.loaded"]))
+        load_module (rs, bs, "bin", loc, false, hints);
+
+      if (!cast_false<bool> (bs["bin.rc.config.loaded"]))
+        load_module (rs, bs, "bin.rc.config", loc, false, hints);
+
+      return true;
+    }
+
+    static const module_functions mod_functions[] =
+    {
+      // NOTE: don't forget to also update the documentation in init.hxx if
+      //       changing anything here.
+
+      {"bin.vars",      nullptr, vars_init},
+      {"bin.config",    nullptr, config_init},
+      {"bin",           nullptr, init},
+      {"bin.ar.config", nullptr, ar_config_init},
+      {"bin.ar",        nullptr, ar_init},
+      {"bin.ld.config", nullptr, ld_config_init},
+      {"bin.ld",        nullptr, ld_init},
+      {"bin.rc.config", nullptr, rc_config_init},
+      {"bin.rc",        nullptr, rc_init},
+      {nullptr,         nullptr, nullptr}
+    };
+
+    const module_functions*
+    build2_bin_load ()
+    {
+      return mod_functions;
+    }
+  }
+}