Mac编译OpenJDK8:configure: error: Xcode 4 is required to build JDK 8, the version found was 10.1config

• 具体错误：

configure: error: Xcode 4 is required to build JDK 8, the version found was 10.1. Use --with-xcode-path to specify the location of Xcode 4 or make Xcode 4 active by using xcode-select.
configure exiting with result code 1

• 解决办法：

common/autoconf/generated-configure.sh

搜索Xcode 4 is require，把as_fn_error改为echo即可.

    # Fail-fast: verify we're building on Xcode 4, we cannot build with Xcode 5 or later
    XCODE_VERSION=`$XCODEBUILD -version | grep '^Xcode ' | sed 's/Xcode //'`
    XC_VERSION_PARTS=( ${XCODE_VERSION//./ } )
    if test ! "${XC_VERSION_PARTS[0]}" = "4"; then
      echo $? "Xcode 4 is required to build JDK 8, the version found was $XCODE_VERSION. Use --with-xcode-path to specify the location of Xcode 4 or make Xcode 4 active by using xcode-select." "$LINENO" 5
    fi