\W4 causing ifort to fail

[jajhall]

Here's a message from a user:

I downloaded the HiGHS software from github. I am compiling the software using Visual Studio 2017 and Intel Fortran 2020 on Windows 10, 64-bit. I used CMAKE version 3.21.1 to build the VS project. I built the "ALL_BUILD" solution at the top of the solution explorer and was left with the following errors,

I tried to build INSTALL afterwards just to see what would happen and I got the same error. You are building a command line to be run by the Fortran compiler (ifort for me) and are passing the option, /W4 . It appears that Intel Fortran does not understand what the "4" is about?

I've replied that /W4 "Specifies how the compiler generates warnings for a given compilation." and is designed for C++ compilers, but appears to be passed for all compilers. I guess that gfortran ignores /W4

We could do with a proper fix for this but my suggestion to the user is that he comments out (or deletes) line 280 of CMakeLists.txt where /W4 is added to the definitions.