Corretto build requires xcode v4 on MacOS about corretto-8

[ziyiluo]

Hi Robert,

In short, Corretto-8 is derived from OpenJDK8. OpenJDK8 code base was stabalized in 2014 and the system requirement remains unchanged. Making Corretto-8 built on a modern Xcode with a newer MacOSX SDK is not impossible but is a non-trivial and risky project that we haven’t prioritized yet. Code changes are required and the system compatibility may be broken.

Building OpenJDK8 on Mac requires the legacy MacOSX SDK 10.8. The last Xcode that contains this SDK version is Xcode 5. Theoretically you should be able to build Corretto-8 with any Xcode version that contains MacOSX SDK 10.8. Linking Corretto-8 against a newer version of SDK may require modifying a bunch of deprecated/removed C flags, macros and apis therefore is not recommended.

For your reference, the official Corretto-8 release is built and tested on OS X Yosemite with Xcode 4.6.

Btw, You can expect a much easier time when we release Corretto-11 :)

Please let us know if you have any follow up questions.