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You may want to add CONFIGURE_DEPENDS. For further context see the recent discussion at Discourse: https://fortran-lang.discourse.group/t/module-dependencies-in-cmake-not-tracked-after-a-module-is-updated/4202/18

Quoting from the More Modern CMake tutorial:

When you rerun the build step (not the configure step), then unless you set CONFIGURE_DEPENDS, your build tool will not check to see if you have added any new files that now pass the glob. This is the reason poorly written CMake projects often have issues when you are trying to add files; some people are in the habit of rerunning cmake before every build because of this. You shouldn’t ever have to manually reconfigure; the build tool will rerun CMake as needed with this one exception. If you add CONFIGURE_DEPENDS, then most build tools will actually start checking glob too. The classic rule of CMake was “never glob”; the new rule is “never glob, but if you have to, add CONFIGURE_DEPENDS”.