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diff --git a/libbuild2/cc/module.hxx b/libbuild2/cc/module.hxx
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+++ b/libbuild2/cc/module.hxx
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+// file      : libbuild2/cc/module.hxx -*- C++ -*-
+// copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
+// license   : MIT; see accompanying LICENSE file
+
+#ifndef LIBBUILD2_CC_MODULE_HXX
+#define LIBBUILD2_CC_MODULE_HXX
+
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
+
+#include <libbuild2/module.hxx>
+#include <libbuild2/variable.hxx>
+
+#include <libbuild2/cc/common.hxx>
+
+#include <libbuild2/cc/compile-rule.hxx>
+#include <libbuild2/cc/link-rule.hxx>
+#include <libbuild2/cc/install-rule.hxx>
+
+#include <libbuild2/cc/export.hxx>
+
+namespace build2
+{
+  namespace cc
+  {
+    struct compiler_info;
+
+    class LIBBUILD2_CC_SYMEXPORT config_module: public module_base,
+                                                public virtual config_data
+    {
+    public:
+      explicit
+      config_module (config_data&& d) : config_data (move (d)) {}
+
+      // We split the configuration process into into two parts: guessing the
+      // compiler information and the actual configuration. This allows one to
+      // adjust configuration (say the standard or enabled experimental
+      // features) base on the compiler information by first loading the
+      // guess module.
+      //
+      void
+      guess (scope&, const location&, const variable_map&);
+
+      void
+      init (scope&, const location&, const variable_map&);
+
+      // Translate the x.std value (if any) to the standard-selecting
+      // option(s) (if any). May also check/set x.features.* variables on the
+      // root scope.
+      //
+      virtual strings
+      translate_std (const compiler_info&, scope&, const string*) const = 0;
+
+      strings tstd;
+      size_t sys_lib_dirs_extra; // First extra path (size if none).
+      size_t sys_inc_dirs_extra; // First extra path (size if none).
+
+      const compiler_info* ci_;
+
+    private:
+      // Defined in gcc.cxx.
+      //
+      dir_paths
+      gcc_header_search_paths (const process_path&, scope&) const;
+
+      dir_paths
+      gcc_library_search_paths (const process_path&, scope&) const;
+
+      // Defined in msvc.cxx.
+      //
+      dir_paths
+      msvc_header_search_paths (const process_path&, scope&) const;
+
+      dir_paths
+      msvc_library_search_paths (const process_path&, scope&) const;
+
+    private:
+      bool new_; // See guess() and init() for details.
+    };
+
+    class LIBBUILD2_CC_SYMEXPORT module: public module_base,
+                                         public virtual common,
+                                         link_rule,
+                                         compile_rule,
+                                         install_rule,
+                                         libux_install_rule
+    {
+    public:
+      explicit
+      module (data&& d)
+          : common (move (d)),
+            link_rule (move (d)),
+            compile_rule (move (d)),
+            install_rule (move (d), *this),
+            libux_install_rule (move (d), *this) {}
+
+      void
+      init (scope&, const location&, const variable_map&);
+    };
+  }
+}
+
+#endif // LIBBUILD2_CC_MODULE_HXX