Description

It appears that with ifort 2021.7 the word "unix" is predefined as a macro. Therefore in functions like os_is_linux and other places where the word "unix" is used. It is reset by the pre-processor to "1". ie.

logical function os_is_unix(os) result(unix)
.
.
unix = build_os /= OS_WINDOWS
end function os_is_unix becomes

Becomes

logical function os_is_unix(os) result(1)
.
.
1 = build_os /= OS_WINDOWS
end function os_is_unix

I got everything to compile by changing all occurences of the logical variable unix to unix_ but
I still get a couple of warnings.

ie

fpm-0.6.0.F90(5150): remark #8291: Recommended relationship between field width 'W' and the number of fractional digits 'D' in this edit descriptor is 'W>=D+7'.
read(nan_string,'(g3.3)')valu
----------------------------^
fpm-0.6.0.F90(13432): warning #6843: A dummy argument with an explicit INTENT(OUT) declaration is not given an explicit value. [SELF]
subroutine new_keyval(self)
----------------------^
ld: /tmp/ifortUNxRu0.o: in function fpm_filesystem_mp_get_temp_filename_': /mnt/Work/FPM/fpm-0.6.0.F90:10050: warning: the use of tempnam' is dangerous, better use `mkstemp'

and yes I know I could use gfortran but I prefer to use intel.

Expected Behaviour

It should have compiled from the start

Version of fpm

0.6.0 fpm-0.6.0.F90

Platform and Architecture

Linux Mint 20.3 (Ubuntu 20.04 base) X86-64

Additional Information

No response