Show CMake detecting change in Fortran module code

build.sh

FC=ifx cmake -Bbuild -G "Unix Makefiles"
cmake --build build
touch modb.f90
# should rebuild here
cmake --build build

CMakeLists.txt

cmake_minimum_required (VERSION 3.20)

project(detectChange LANGUAGES Fortran)

add_executable(main.x main.f90 moda.f90 modb.f90)

main.f90

program main
use a
implicit none
print '(i0)', i
end program

moda.f90

module a
use b
implicit none
end module

modb.f90

module b
integer, parameter :: i = 123
end module