X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Ftarget.cpp;h=e8ed647477fcf82823f06195cfa8a7e43edf7441;hb=57bdb055acb0453c75b22cb64f35cc0e817a2827;hp=e03428837838afdbd78447862075f4db66d082b6;hpb=1a46151c99a406123c4ddfc797a7841baf3e4cc2;p=builder.git

diff --git a/source/target.cpp b/source/target.cpp
index e034288..e8ed647 100644
--- a/source/target.cpp
+++ b/source/target.cpp
@@ -8,9 +8,17 @@
 using namespace std;
 using namespace Msp;
 
+/**
+Tries to locate a target that will help getting this target built.  If all
+dependencies are up-to-date, returns this target.  If there are no targets
+ready to be built (maybe because they are being built right now), returns 0.
+*/
 Target *Target::get_buildable_target()
 {
-	bool self_ok=true;
+	if(!rebuild)
+		return 0;
+
+	bool self_ok=!building;
 	for(TargetList::iterator i=depends.begin(); i!=depends.end(); ++i)
 	{
 		Target *tgt=(*i)->get_buildable_target();
@@ -20,7 +28,7 @@ Target *Target::get_buildable_target()
 			self_ok=false;
 	}
 
-	if(self_ok && rebuild && !building)
+	if(self_ok)
 		return this;
 
 	return 0;
@@ -32,17 +40,28 @@ void Target::add_depend(Target *dep)
 	dep->rdepends.push_back(this);
 }
 
+/**
+Prepares the target by recursively preparing dependencies, then checking
+whether rebuilding is needed.  A flag is used to prevent unnecessary
+executions.
+*/
 void Target::prepare()
 {
 	if(prepared)
 		return;
 
+	prepared=true;
 	for(TargetList::iterator i=depends.begin(); i!=depends.end(); ++i)
 		(*i)->prepare();
 
 	check_rebuild();
+
 }
 
+/**
+Returns the number of targets that need to be rebuilt in order to get this
+target up-to-date.
+*/
 unsigned Target::count_rebuild()
 {
 	if(counted)
@@ -55,6 +74,9 @@ unsigned Target::count_rebuild()
 	return count;
 }
 
+/**
+Changes the mtime of the target to the current time.
+*/
 void Target::touch()
 {
 	mtime=Time::now();
@@ -82,6 +104,9 @@ void Target::mark_rebuild(const std::string &reason)
 	rebuild_reason=reason;
 }
 
+/**
+Checks if this target needs to be rebuilt and why.
+*/
 void Target::check_rebuild()
 {
 	if(!buildable)
@@ -105,6 +130,10 @@ void Target::check_rebuild()
 		mark_rebuild("Package options changed");
 }
 
+/**
+Hooks the target up with the given action, then returns it.  This should be
+called from the public build() function of buildable targets.
+*/
 Action *Target::build(Action *action)
 {
 	building=true;
@@ -112,6 +141,9 @@ Action *Target::build(Action *action)
 	return action;
 }
 
+/**
+Handles for the build_done signal of Action.
+*/
 void Target::build_done()
 {
 	building=false;