Detecting compiler versions during compile time
As someone who has ported more than his fair share of 'C' around, I can see were you are coming from, so here is some to get us started:
For IBM CL/C++ compiler product:
__xlc__ - Format is V.R.M.F eg: "9.0.0.0"__IBMCPP__ Format is an integer as VRM eg: V9.0 is 900__IBMC__ - Format is an integer as VRM, which indicates the level of compiler as VRM as:< 200 is C Set/2< 300 is C Set++otherwise is Visual Age C++ V.M.C where V=version, M=release, M=modification and F=fix level.For Borland C:
___BORLANDC__ ??For GNU C:
__GNUC__ ??For Watcon C:
__WATCOMC__
There is a table of this information here:
https://sourceforge.net/p/predef/wiki/Compilers/
Sadly, It appears that MacOS defines __clang__, __GNUCC__ and __llvm__ so this information can get a little confused.
But usually, only one set of information applies.