What's the "real" official build platform for MacOS X?

[Volker Simonis]

Hi,

recently a changed [1] was pushed to jdk9/hs-gc/hotspot which does not
compile neither with clang 5.1 nor with clang 4.0.

The OpenJDK Wiki [2] lists XCode / clang5.1.1 as the official compiler
tool chain for MacOS X so I wonder how this change could slip trough
JPRT without noticing the problem. The only explanation I have so far
is that JPRT still uses gcc to compile on MacOS X. Can somebody
confirm this?

Thanks,
Volker

PS: meanwhile the problem has been fixed [3]

[1] http://hg.openjdk.java.net/jdk9/hs-gc/hotspot/rev/1573e72240b9
[2] https://wiki.openjdk.java.net/display/Build/Supported+build+platforms
[3] https://bugs.openjdk.java.net/browse/JDK-8074319