[gentoo-portage-dev] [PATCH] _pkg_use_enabled: return frozenset (531112)

[Zac Medico <zmedico@gentoo.org>]

Since commit 9ba4f2aa6a2755a73fb652b4557919047d649fd1, _pkg_use_enabled
needs to consistently return a frozenset, so that the result is
hashable.

Fixes: 9ba4f2aa6a27 ("_slot_operator_update_probe: memoize use_reduce (529660)")
X-Gentoo-Bug: 531112
X-Gentoo-Url: https://bugs.gentoo.org/show_bug.cgi?id=531112
---
 pym/_emerge/depgraph.py | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/pym/_emerge/depgraph.py b/pym/_emerge/depgraph.py
index a0169ff..3455b6b 100644
--- a/pym/_emerge/depgraph.py
+++ b/pym/_emerge/depgraph.py
@@ -5321,6 +5321,9 @@ class depgraph(object):
 		If target_use is given, the need changes are computed to make the package useable.
 		Example: target_use = { "foo": True, "bar": False }
 		The flags target_use must be in the pkg's IUSE.
+		@rtype: frozenset
+		@return: set of effectively enabled USE flags, including changes
+			made by autounmask
 		"""
 		if pkg.built:
 			return pkg.use.enabled
@@ -5387,6 +5390,10 @@ class depgraph(object):
 
 			return False
 
+		# Always return frozenset since the result needs to be
+		# hashable (see bug #531112).
+		new_use = frozenset(new_use)
+
 		if new_changes != old_changes:
 			#Don't do the change if it violates REQUIRED_USE.
 			required_use = pkg._metadata.get("REQUIRED_USE")
-- 
2.0.4