Qt for ios编译报错：ld: symbol(s) not found for architecture x86_64

Qt使用5.12.2编译ios simulator平台代码，报错：

Undefined symbols for architecture x86_64:

  "_backtrace_from_fp", referenced from:

      QMacAutoReleasePool::QMacAutoReleasePool() in libQt5Core_debug.a(qcore_mac_objc.o)

ld: symbol(s) not found for architecture x86_64

项目配置为macOS10.13 + Qt5.12.2 + xcode9

Qt官网查看5.12平台支持配置

mac10.13从商店无法安装xcode10，需要升级mac10.14，这种方法太麻烦，尝试Qt更低的版本5.10.0

编译通过：