Large stack array WCHAR[4096] triggered a stack probe (__chkstk_ms) unavailable in -nostdlib builds. Fix: heap-allocate the pass-through command line buffer, and add -mno-stack-arg-probe as a safety net. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01D8ckUJQtj1pH8jtAddBDZs