8 #include <sigc++/signal.h>
9 #include <msp/time/timestamp.h>
20 Targets make up the build graph. This class is a base for all target types and
21 handles many common tasks. See also FileTarget and VirtualTarget.
26 typedef std::list<Target *> Dependencies;
39 sigc::signal<void> signal_bubble_rebuild;
43 const Package *package;
44 const Component *component;
49 std::string rebuild_reason;
50 std::string install_location;
54 Target(Builder &, const std::string &);
58 virtual const char *get_type() const = 0;
59 const std::string &get_name() const { return name; }
60 const Package *get_package() const { return package; }
61 const Component *get_component() const { return component; }
63 /** Tries to locate a target that will help getting this target built. If
64 all dependencies are up-to-date, returns this target. If there are no
65 targets ready to be built (maybe because they are being built right now),
67 virtual Target *get_buildable_target();
69 /** If this target is a proxy for another (such as Install), return that
70 target. Otherwise, return the target itself.
72 Implementors should call the function recursively to find the final target. */
73 virtual Target *get_real_target() { return this; }
75 void set_tool(const Tool &);
76 const Tool *get_tool() const { return tool; }
78 /** Indicates if it's possible to build this target. */
79 bool is_buildable() const { return tool!=0; }
81 /** Indicates if this target needs rebuilding. Only makes sense after the
82 target has been prepared. */
83 bool needs_rebuild() const { return state>PREPARING && state<UPTODATE; }
85 /** Returns the reason for rebuilding this target. Only makes sense after
86 the target has been prepared. */
87 const std::string &get_rebuild_reason() const { return rebuild_reason; }
89 /** Forces rebuild of the target. */
92 bool is_installable() const { return !install_location.empty(); }
93 const std::string &get_install_location() const { return install_location; }
94 void add_depend(Target *);
95 const Dependencies &get_depends() const { return depends; }
97 /** Finds dependencies for the target. */
98 virtual void find_depends() { }
100 /** Prepares the target by finding dependencies, recursively preparing them
101 and then checking whether rebuilding is needed. */
102 virtual void prepare();
104 /** Starts building the target. Returns the Action used for building. */
107 void mark_rebuild(const std::string &);
109 /** Checks if the target needs to be rebuilt and why. */
110 virtual void check_rebuild() = 0;
112 /** Handler for Task::signal_finished. */
113 virtual void build_finished(bool);