Disable JIT on Apple Silicon + ZTS

Apple Silicon has stricter rules about rwx mmap regions. They need to be created
using the MAP_JIT flag. However, the MAP_JIT seems to be incompatible with
MAP_SHARED. ZTS requires MAP_SHARED so that some threads may execute code from a
page while another writes/appends to it. We did not find another solution, other
than completely disabling JIT for Apple Silicon + ZTS.

See discussion in #13351.

Co-authored-by: Peter Kokot <[email protected]>
Fixes GH-13400
Closes GH-13396

Author: 2 people

ext/opcache/config.m4

@@ -36,6 +36,10 @@ if test "$PHP_OPCACHE" != "no"; then
         PHP_OPCACHE_JIT=no
         ;;
     esac
+    if test "$host_vendor" = "apple" && test "$host_cpu" = "aarch64" && test "$PHP_THREAD_SAFETY" = "yes"; then
+      AC_MSG_WARN([JIT not supported on Apple Silicon with ZTS])
+      PHP_OPCACHE_JIT=no
+    fi
   fi
 
   if test "$PHP_OPCACHE_JIT" = "yes"; then