[PATCH] Improve macOS version detection to support macOS 11 and simplify legacy logic

[Jeremy Huddleston Sequoia]

Signed-off-by: Jeremy Huddleston Sequoia <jeremyhu@apple.com>
---
 m4/libtool.m4 | 13 ++++---------
 1 file changed, 4 insertions(+), 9 deletions(-)

diff --git a/m4/libtool.m4 b/m4/libtool.m4
index f2d1f398..b971e8e7 100644
--- a/m4/libtool.m4
+++ b/m4/libtool.m4
@@ -1067,16 +1067,11 @@ _LT_EOF
       _lt_dar_allow_undefined='$wl-undefined ${wl}suppress' ;;
     darwin1.*)
       _lt_dar_allow_undefined='$wl-flat_namespace $wl-undefined ${wl}suppress' 
;;
-    darwin*) # darwin 5.x on
-      # if running on 10.5 or later, the deployment target defaults
-      # to the OS version, if on x86, and 10.4, the deployment
-      # target defaults to 10.4. Don't you love it?
-      case ${MACOSX_DEPLOYMENT_TARGET-10.0},$host in
-       10.0,*86*-darwin8*|10.0,*-darwin[[91]]*)
-         _lt_dar_allow_undefined='$wl-undefined ${wl}dynamic_lookup' ;;
-       10.[[012]][[,.]]*)
+    darwin*)
+      case ${MACOSX_DEPLOYMENT_TARGET},$host in
+       10.[[012]],*|,*powerpc*)
          _lt_dar_allow_undefined='$wl-flat_namespace $wl-undefined 
${wl}suppress' ;;
-       10.*)
+       *)
          _lt_dar_allow_undefined='$wl-undefined ${wl}dynamic_lookup' ;;
       esac
     ;;
-- 
2.24.3 (Apple Git-128)