-fno-sanitize=undefined is enabled in zig by default, not in gcc and clang

src/SPC/builder/extension/opcache.php

@@ -51,4 +51,15 @@ class opcache extends Extension
     {
         return 'Zend Opcache';
     }
+
+    public function patchBeforeMake(): bool
+    {
+        if (!str_contains(getenv('CC'), 'zig')) {
+            return false;
+        }
+        // opcache requires -lunwind, the equivalent to -lgcc_s that gcc automatically links
+        $extra_libs = trim(getenv('SPC_EXTRA_LIBS') . ' -lunwind');
+        f_putenv('SPC_EXTRA_LIBS=' . $extra_libs);
+        return true;
+    }
 }