CMake language standard settings

[ivan-pi]

vapaa/CMakeLists.txt

Lines 24 to 25 in 3a5ba0b

	set(CMAKE_Fortran_STANDARD 2018)
	set(CMAKE_Fortran_STANDARD_REQUIRED ON)

These settings don't exist AFAIK. The ones which do exist are shown here: https://cmake.org/cmake/help/latest/prop_tgt/LANG_STANDARD.html

There is a CMake issue open for this (https://gitlab.kitware.com/cmake/cmake/-/issues/25006), but the current opinion is this ain't really needed.

If you'd like to add the conformity checkings flags, I'd recommend a generator expression instead:e

$<$<FORTRAN_COMPILER_ID:GNU>:-std=f2018>
$<$<FORTRAN_COMPILER_ID:Intel>:-stand f2018>
$<$<FORTRAN_COMPILER_ID:NAG>:-f2018>

[JorgeG94]

@ivan-pi I did the cmake so I can fix this

[JorgeG94]

please see #55