[gentoo-dev] [PATCH] llvm-r1.eclass: Do not default-enable unkeyworded slots

["Michał Górny" <mgorny@gentoo.org>]

Change the IUSE defaults logic to default-enable the *oldest* ~arch
version rather than the newest one, when no stable slots are supported.
Since we only except a single ~arch version to exist, this effectively
prevents the eclass from default-enabling the unkeyworded snapshots.

Closes: https://bugs.gentoo.org/935681
Signed-off-by: Michał Górny <mgorny@gentoo.org>
---
 eclass/llvm-r1.eclass | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/eclass/llvm-r1.eclass b/eclass/llvm-r1.eclass
index 075df9218be8..ea8ecff2890e 100644
--- a/eclass/llvm-r1.eclass
+++ b/eclass/llvm-r1.eclass
@@ -123,11 +123,16 @@ _llvm_set_globals() {
 	fi
 
 	if [[ ${stable[@]} ]]; then
+		# If there is at least one stable slot supported, then enable
+		# the newest stable slot by default.
 		IUSE="+llvm_slot_${stable[-1]}"
 		unset 'stable[-1]'
 	else
-		IUSE="+llvm_slot_${unstable[-1]}"
-		unset 'unstable[-1]'
+		# Otherwise, enable the "oldest" ~arch slot.  We really only
+		# expect a single ~arch version, so this primarily prevents
+		# defaulting to non-keyworded slots.
+		IUSE="+llvm_slot_${unstable[0]}"
+		unset 'unstable[0]'
 	fi
 	local nondefault=( "${stable[@]}" "${unstable[@]}" )
 	IUSE+=" ${nondefault[*]/#/llvm_slot_}"
-- 
2.45.2