react-native 在新版Xcode（10+）中运行出现的

20181210 更新：问题实质是缺少第三方库，查看官方解决办法

在网上下了一个RN的demo，运行报错：

～～～～/node_modules/react-native/third-party/glog-0.3.4':

 C compiler cannot create executablesCommand PhaseScriptExecution emitted errors but did not return a nonzero exit code to indicate failure

 :-1: Build input file cannot be found: '/Users/～～～～/node_modules/react-native/third-party/double-conversion-1.1.5/src/strtod.cc'

 :-1: Build input file cannot be found: '/Users/～～～～/node_modules/react-native/third-party/double-conversion-1.1.5/src/fixed-dtoa.cc'

 :-1: Build input file cannot be found: '/Users/～～～～/node_modules/react-native/third-party/double-conversion-1.1.5/src/fast-dtoa.cc'

在网上找了一下解决办法，在此记录一下：

github 问题地址  https://github.com/facebook/react-native/issues/19774

如果是因为下载了新的插件或者迁移项目导致构建出现这种问题在项目根目录下运行：

  cd ./node_modules/react-native/third-party/glog-0.3.4 && ../../scripts/ios-configure-glog.sh 

https://github.com/facebook/react-native/issues/19774#issuecomment-397910801