I need to use gfortran to compile a library that is dependent on ieee_arithmetic
. However, it is found that gfortran can not identify this module.
For example with the code a.f90
program test
use,intrinsic :: ieee_arithmetic
real :: x
read *, x
if (ieee_is_nan(x)) then
print *, "Nan"
else
print *, "Not NaN"
end if
end program test
I have the following message when compiling
$ gfortran a.f90
a.f90:2.19:
use,intrinsic :: ieee_arithmetic
1
Fatal Error: Can't find an intrinsic module named 'ieee_arithmetic' at (1)
How can I let gfortran know where the ieee_arithmetic
intrinsic module is?
ifort is found to be able to use the ieee_arithmetic
module. But I wish to make gfortran work for this case.
The IEEE modules are supported as of GFortran version 5. See https://gcc.gnu.org/gcc-5/changes.html If you are using an older version, you should see the error message you have shown in your post.