Add support for building multiple configurations

Now, you can build in separate directories per configuration:

	mkdir foo
	(cd foo && ../setup.lua)
	samu -C foo

1 files changed, 3 insertions, 2 deletions

diff --git a/gen.lua b/gen.lua
index 0568bf85..30a3cb52 100644
--- a/gen.lua
+++ b/gen.lua
@@ -1,7 +1,8 @@
 set('ninja_required_version', '1.8')
 
-set('basedir', '.')
+set('basedir', basedir)
 set('builddir', config.builddir)
+set('dir', '$basedir')
 set('outdir', '$builddir')
 
 set('target_toolchain', config.target.toolchain)
@@ -17,7 +18,7 @@ set('repo_flags', config.repo.flags)
 set('repo_tag', config.repo.tag)
 set('repo_branch', config.repo.branch)
 
-include 'rules.ninja'
+include '$basedir/rules.ninja'
 
 toolchain 'target'