Came across a somewhat old piece of fortran code that cannot compile with `/fpp` specified in `ifort`: https://gitlab.cern.ch/garfield/garfieldpp/-/blob/master/Magboltz/magboltz.f With `/fpp` will output: ``` #error: comment doesn't end to the end of file. ``` Cmake always generates `/fpp` in `CMAKE_Fortran_FLAGS` when compiling with ifort (even with `CMAKE_Fortran_PREPROCESS` set to `OFF`), and had to edit cmake cache to remove this.