Why do PGI Fortran compilers use -Mpreprocess and -Kieee by default?

Seen here: https://gitlab.kitware.com/cmake/cmake/blob/v3.9.1/Modules/Compiler/PGI-Fortran.cmake#L10

-Kieee flag reduces runtime performance while -Mpreprocess might surprise users, preprocessing code not meant to be preprocessed. Is there a reason why these two flags are added by default?

Edited Aug 25, 2017 by Brad King

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information