Add support for Cray, Fujitsu, and Intel ICX compilers

Matthias Möllerrequested to merge
mmoelle1/eigen:master into master

  1. This MR adds support for the Cray (CPE), Fujitsu (FCC), and Intel ICX compilers

    The following preprocessor macros are added:

    • EIGEN_COMP_CPE and EIGEN_COMP_CLANGCPE version number of the CRAY compiler if Eigen is compiled with the Cray C++ compiler, 0 otherwise
    • EIGEN_COMP_FCC and EIGEN_COMP_CLANGFCC version number of the FCC compiler if Eigen is compiled with the Fujitsu C++ compiler, 0 otherwise
    • EIGEN_COMP_CLANGICC version number of the ICX compiler if Eigen is compiled with the Intel oneAPI C++ compiler, 0 otherwise

    All three compilers (Cray, Fujitsu, Intel) offer a traditional and a Clang-based frontend. This is distinguished by the CLANG fix.

  2. This MR extends the detection of the IBM XL compiler to V13.1 and V16.1 which use other predefined macros

Edited by Matthias Möller

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