From 921fc49488a68442fb8794e1a0284a3bf1e7b91b Mon Sep 17 00:00:00 2001
From: Mikko Rasa <tdb@tdb.fi>
Date: Fri, 10 Aug 2007 19:50:21 +0000
Subject: [PATCH] Add an option to component to specify whether or not it
 should be built by default Handle building world properly

---
 source/builder.cpp   | 17 ++++++++++++++---
 source/component.cpp |  4 +++-
 source/component.h   |  4 +++-
 source/target.cpp    |  2 ++
 4 files changed, 22 insertions(+), 5 deletions(-)

diff --git a/source/builder.cpp b/source/builder.cpp
index ccfb407..38a7139 100644
--- a/source/builder.cpp
+++ b/source/builder.cpp
@@ -579,7 +579,7 @@ int Builder::create_targets()
 					exe=new Executable(*this, *j, objs);
 
 				add_target(exe);
-				if(i->second==default_pkg)
+				if(i->second==default_pkg && j->get_default())
 				{
 					def_tgt->add_depend(exe);
 					if(slib) def_tgt->add_depend(slib);
@@ -649,7 +649,7 @@ int Builder::create_targets()
 	// Make the cmdline target depend on all targets mentioned on the command line
 	Target *cmdline=new VirtualTarget(*this, "cmdline");
 	add_target(cmdline);
-	world->add_depend(cmdline);
+	bool build_world=false;
 	for(list<string>::iterator i=cmdline_targets.begin(); i!=cmdline_targets.end(); ++i)
 	{
 		Target *tgt=get_target(*i);
@@ -660,10 +660,21 @@ int Builder::create_targets()
 			cerr<<"I don't know anything about "<<*i<<'\n';
 			return -1;
 		}
+		if(tgt==world)
+			build_world=true;
 		cmdline->add_depend(tgt);
 	}
 
-	world->prepare();
+	/* If world is to be built, prepare cmdline.  If not, add cmdline to world
+	   and prepare world.  I don't really like this, but it keeps the graph
+	   acyclic. */
+	if(build_world)
+		cmdline->prepare();
+	else
+	{
+		world->add_depend(cmdline);
+		world->prepare();
+	}
 
 	return 0;
 }
diff --git a/source/component.cpp b/source/component.cpp
index fdc0a6d..4bdff21 100644
--- a/source/component.cpp
+++ b/source/component.cpp
@@ -10,7 +10,8 @@ Component::Component(Package &p, Type t, const string &n):
 	name(n),
 	install(false),
 	module_host(0),
-	modular(false)
+	modular(false),
+	deflt(true)
 { }
 
 /**
@@ -62,6 +63,7 @@ Component::Loader::Loader(Component &c):
 	add("require",         &Loader::require);
 	add("modular",         &Loader::modular);
 	add("host",            &Loader::host);
+	add("default",         &Component::deflt);
 }
 
 void Component::Loader::source(const string &s)
diff --git a/source/component.h b/source/component.h
index e1df73a..e505735 100644
--- a/source/component.h
+++ b/source/component.h
@@ -34,7 +34,7 @@ public:
 		void host(const std::string &);
 		void build_info();
 	};
-	
+
 	enum Type
 	{
 		PROGRAM,
@@ -53,6 +53,7 @@ public:
 	const std::string &get_install_headers() const { return install_headers; }
 	bool              get_modular() const          { return modular; }
 	const PkgRefList  &get_requires() const        { return requires; }
+	bool              get_default() const          { return deflt; }
 	void              resolve_refs();
 	void              create_build_info();
 protected:
@@ -66,6 +67,7 @@ protected:
 	bool        modular;
 	BuildInfo   build_info;
 	PkgRefList  requires;
+	bool        deflt;
 };
 typedef std::list<Component> ComponentList;
 
diff --git a/source/target.cpp b/source/target.cpp
index e8ed647..3b16853 100644
--- a/source/target.cpp
+++ b/source/target.cpp
@@ -36,6 +36,8 @@ Target *Target::get_buildable_target()
 
 void Target::add_depend(Target *dep)
 {
+	if(dep==this)
+		throw InvalidParameterValue("A target can't depend on itself");
 	depends.push_back(dep);
 	dep->rdepends.push_back(this);
 }
-- 
2.43.0