Currently we have several problems with the hotspot build on AIX:

- we don't properly switch off the usage of precompiled headers so we unnecessarily include the full contents of precompiled.hpp into all compilation units.

- most of the optimization flags are also used for the slowdebug build which makes the build times unnecessarily long and the resulting executable unnecessarily hard to debug.

- gtest isn't currently supported on AIX and should be switched off by default.

- jvmtiEnterTrace.cpp contains too many call to log_trace() which makes the build times for the fastdebug and product build too long (up to 30min). As this file is not performance critical it should be compiled with a lower optimization level on AIX.