lib/systems/parse: stop considering armv8a able to execute armv7l

In the past, most (if not all) armv8 CPUs could also execute armv7. However,
with the advent of Apple Silicon, aarch64 CPUs without any aarch32 capabilities
are now wide-spread among users.

1 files changed, 2 insertions, 13 deletions

diff --git a/lib/systems/parse.nix b/lib/systems/parse.nix
index 8fb13af1f530f..5987cf1b5d245 100644
--- a/lib/systems/parse.nix
+++ b/lib/systems/parse.nix
@@ -182,23 +182,12 @@ rec {
     (b == armv7l && isCompatible a armv7a)
     (b == armv7l && isCompatible a armv7r)
     (b == armv7l && isCompatible a armv7m)
-    (b == armv7a && isCompatible a armv8a)
-    (b == armv7r && isCompatible a armv8a)
-    (b == armv7m && isCompatible a armv8a)
-    (b == armv7a && isCompatible a armv8r)
-    (b == armv7r && isCompatible a armv8r)
-    (b == armv7m && isCompatible a armv8r)
-    (b == armv7a && isCompatible a armv8m)
-    (b == armv7r && isCompatible a armv8m)
-    (b == armv7m && isCompatible a armv8m)
 
     # ARMv8
-    (b == armv8r && isCompatible a armv8a)
-    (b == armv8m && isCompatible a armv8a)
-
-    # XXX: not always true! Some arm64 cpus don’t support arm32 mode.
     (b == aarch64 && a == armv8a)
     (b == armv8a && isCompatible a aarch64)
+    (b == armv8r && isCompatible a armv8a)
+    (b == armv8m && isCompatible a armv8a)
 
     # PowerPC
     (b == powerpc && isCompatible a powerpc64)