Merge topic 'IntelLLVM-Fortran-no-isystem' into release-3.29 a80d8e839d IntelLLVM: Revert accidental use of -external:I with Fortran compilers Acked-by: Kitware Robot <kwrobot@kitware.com> Reviewed-by: Ben Boeckel <ben.boeckel@kitware.com> Merge-request: !9368