Before installing XL C

Before you install IBM® XL C for AIX®, V12.1:

Familiarize yourself with the installation image, which contains the installable compiler filesets.
Ensure that system prerequisites such as disk space and operating system are met.
Determine the tasks you need to perform, depending on your installation requirements.
Become either the root user or a user with administrator privileges.

Upgrading the evaluation copy of the XL C compiler

You can upgrade the evaluation version of the compiler to the licensed version by installing the licensed product package on top of the evaluation package. By following the Basic installation or Advanced installation procedure for the licensed product package, the compiler license can be installed. Shared filesets between the evaluation and licensed versions that have already been installed are reported as Already installed.

Note: If the evaluation version was installed using the advanced (non-default) installation method, and you want to install the licensed version using the same method, you must first remove the evaluation version using rm -rf, or install the licensed version to a different directory than the evaluation version.