[Predef-contribute] SourceForge Compilers Macro Wiki Suggestions from IBM

[Nicole T. <ni...@ca...>]

Hello,

On Linux and AIX, IBM has recently made a new compilers available that are
based on the Clang compiler. Unfortunately, the macros in these new
Clang-based compilers and the older legacy compilers are quite different,
and we were wondering if the IBM XL section can be split again so that the
current IBM XL C/C++ section becomes 1. IBM XL C/C++ (Clang-based
versions), and 2. IBM XL C/C++ (legacy versions). The z/OS XL C/C++ section
would stay as well.

In addition to those changes, we were wondering if the Clang section can
get a note that IBM XL is also defining __clang__ and related macros, and
if the LLVM section can get a note that IBM XL is also defining __llvm__.

Full suggestions in the attachment (changes are in red, including some
updated links), appreciate your consideration!

We have proposed compiler version identification in the format that's
already on the page VRPB, but since IBM has it's own acronym VRMF, we have
included "also called..." notes. We did the same kind of thing in the Clang
section. If you're not concerned with consistency across the page, perhaps
we could just use VRMF for the IBM sections instead.

(See attached file: SourceForge Compilers Macro Wiki Suggestions from IBM
20190129.docx)

Thanks,
Nicole Trudeau, P. Eng.
IBM Z Systems Software > Compilers
Digital Marketing & Customer Support
C2-818, Toronto, Canada Office