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diff --git a/tiger-compiler/src/task/libtask.hh b/tiger-compiler/src/task/libtask.hh
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+/**
+ ** \file task/libtask.hh
+ ** \brief Interface to the Task module.
+ **
+ */
+
+/* This file must not be protected against multiple inclusion,
+   because it might be read to define or declare the tasks. */
+
+#include <task/boolean-task.hh>
+#include <task/disjunctive-task.hh>
+#include <task/function-task.hh>
+#include <task/int-task.hh>
+#include <task/multiple-string-task.hh>
+#include <task/string-task.hh>
+
+/// Handling of Task.
+namespace task
+{} // namespace task
+
+/** A means to concatenate tokens with delayed evaluation. */
+#define CONCAT_(A, B) A##B
+#define CONCAT(A, B) CONCAT_(A, B)
+
+/** Make a "unique" token using the line number of invocation of this
+    macro.
+
+    Conflicts are possible, but unlikely: tasks declared at the same
+    line number, but in different files, are not a problem, since
+    anyway the tasks are static, and in different namespaces.
+
+    Just don't declare two tasks on the same line! */
+#define TASK_UNIQUE() CONCAT(task_, __LINE__)
+
+/*------------------------------.
+| Easy instantiation of Tasks.  |
+`------------------------------*/
+
+#undef TASK_GROUP
+#undef TASK_DECLARE
+#undef BOOLEAN_TASK_DECLARE
+#undef INT_TASK_DECLARE
+#undef STRING_TASK_DECLARE
+#undef MULTIPLE_STRING_TASK_DECLARE
+#undef DISJUNCTIVE_TASK_DECLARE
+
+// Should we define the objects, or just declare them?
+#if DEFINE_TASKS
+
+/// Define the current Task group name.
+#  define TASK_GROUP(Name) const char group_name[] = Name
+
+/// Instantiate a FunctionTask.
+#  define TASK_DECLARE(Name, Help, Routine, Deps)                              \
+    extern void(Routine)();                                                    \
+    static task::FunctionTask task_##Routine(Routine, group_name, Help, Name,  \
+                                             Deps)
+
+/// Instantiate a BooleanTask.
+#  define BOOLEAN_TASK_DECLARE(Name, Help, Flag, Deps)                         \
+    bool Flag;                                                                 \
+    static task::BooleanTask task_##Flag(Flag, group_name, Help, Name, Deps)
+
+#  define TASK_UNIQUE_NAME_(Line) task_##Line
+
+#  define TASK_UNIQUE_NAME TASK_UNIQUE_NAME_(__LINE__)
+
+/// Instantiate an IntTask.
+#  define INT_TASK_DECLARE(Name, Min, Max, Help, Flag, Deps)                   \
+    static task::IntTask TASK_UNIQUE()(Flag, Min, Max, group_name, Help, Name, \
+                                       Deps)
+
+/// Instantiate a StringTask.
+#  define STRING_TASK_DECLARE(Name, Default, Help, Flag, Deps)                 \
+    std::string Flag = Default;                                                \
+    static task::StringTask task_##Flag(Flag, group_name, Help, Name, Deps)
+
+/// Instanciate a MultipleStringTask
+#  define MULTIPLE_STRING_TASK_DECLARE(Name, Help, Routine, Deps)              \
+    extern task::MultipleStringTask::callback_type Routine;                    \
+    static task::MultipleStringTask task_##Routine(Routine, group_name, Help,  \
+                                                   Name, Deps)
+
+/// Instantiate a DisjunctiveTask.
+#  define DISJUNCTIVE_TASK_DECLARE(Name, Help, Deps)                           \
+    static task::DisjunctiveTask task_##Routine(group_name, Help, Name, Deps)
+
+#else // !DEFINE_TASKS
+
+/// Define the current Task group name.
+#  define TASK_GROUP(Name) extern const char* group_name
+/// Instantiate a FunctionTask.
+#  define TASK_DECLARE(Name, Help, Routine, Deps) extern void(Routine)()
+/// Instantiate a BooleanTask.
+#  define BOOLEAN_TASK_DECLARE(Name, Help, Flag, Deps) extern bool Flag;
+/// Instantiate an IntTask.
+#  define INT_TASK_DECLARE(Name, Min, Max, Help, Flag, Deps)
+/// Instantiate a StringTask.
+#  define STRING_TASK_DECLARE(Name, Default, Help, Flag, Deps)                 \
+    extern std::string Flag;
+/// Instantiate a MultipleStringTask.
+#  define MULTIPLE_STRING_TASK_DECLARE(Name, Help, Routine, Deps)              \
+    extern void(Routine)(std::string);
+/// Instantiate a DisjunctiveTask.
+#  define DISJUNCTIVE_TASK_DECLARE(Name, Help, Deps)
+
+#endif // !DEFINE_TASKS