In config.setcpv(), increase efficiency by filtering USE with IUSE before

calculating USE_EXPAND variables. Also use a generator expression instead
of a list comprehension in the USE_EXPAND generation code.

svn path=/main/trunk/; revision=12697

diff --git a/pym/portage/__init__.py b/pym/portage/__init__.py
index cf44ef92b2c2b9d2e7a0ed0e60d77a48e541951d..90a3044152e1921efd0928b14045d7c72aa78d0a 100644 (file)
--- a/pym/portage/__init__.py
+++ b/pym/portage/__init__.py
@@ -2119,6 +2119,8 @@ class config(object):
                                if ebuild_force_test:
                                        self.usemask.discard("test")
 
+               use.difference_update([x for x in use if x not in iuse_implicit])
+
                # Use the calculated USE flags to regenerate the USE_EXPAND flags so
                # that they are consistent. For optimal performance, use slice
                # comparison instead of startswith().
@@ -2126,8 +2128,8 @@ class config(object):
                for var in use_expand:
                        prefix = var.lower() + "_"
                        prefix_len = len(prefix)
-                       expand_flags = set([ x[prefix_len:] for x in use \
-                               if x[:prefix_len] == prefix ])
+                       expand_flags = set( x[prefix_len:] for x in use \
+                               if x[:prefix_len] == prefix )
                        var_split = self.get(var, "").split()
                        # Preserve the order of var_split because it can matter for things
                        # like LINGUAS.
@@ -2189,9 +2191,7 @@ class config(object):
                # attribute since we still want to be able to see global USE
                # settings for things like emerge --info.
 
-               self.configdict["pkg"]["PORTAGE_USE"] = " ".join(sorted(
-                       x for x in use if \
-                       x in iuse_implicit))
+               self.configdict["pkg"]["PORTAGE_USE"] = " ".join(sorted(use))
 
        def _get_implicit_iuse(self):
                """