I'm writing an example script in Fortran 2008 and compiling it with gfortran on my M1 mac. When trying to compile it, I get this error:
Undefined symbols for architecture arm64:
"___mymodule_MOD_myfunc", referenced from:
_MAIN__ in cca7mVdW.o
"___mymodule_MOD_mysub", referenced from:
_MAIN__ in cca7mVdW.o
ld: symbol(s) not found for architecture arm64
collect2: error: ld returned 1 exit status
My gfortran version:
GNU Fortran (Homebrew GCC 12.1.0) 12.1.0
Copyright (C) 2022 Free Software Foundation, Inc.
The error only occurs when I use a function or subroutine from a different file.
example.f08
program myProgram
use myModule
implicit none
integer :: myInteger = 10
real :: myFloat = 5.2
complex :: myTuple = (1.0, -0.5)
character :: myChar = "E"
character(len=5) :: myString = "Hello"
logical :: myBool = .true.
print *, myInteger
print *, myFloat
print *, myTuple
print *, myChar
print *, myString
print *, myBool
print *
print *, myInteger
! From the module "myModule"
myInteger = myFunc(myInteger)
print *, myInteger
! Also from the module "myModule"
call mySub(myInteger)
end program myProgram
module.f08:
module myModule
implicit none
private
public myFunc, mySub
contains
integer function myFunc(input) result(output)
integer, intent(in) :: input
output = input + 1
end function myFunc
subroutine mySub(input)
integer, intent(in) :: input
print *, input - 1
end subroutine mySub
end module myModule
