Clang Warning after running 'stack test' on macOS

I get the following warning every time I run 'stack test':

[2 of 2] Compiling Paths_leap
Linking .stack-work/dist/x86_64-osx/Cabal-2.2.0.1/build/test/test ...
clang: warning: argument unused during compilation: '-nopie' [-Wunused-command-line-argument]

The test runs fine after compiling is complete, but I'd like to know what is causing the warning to occur.

Start by reproducing the warning with `stack test` on macOS and inspect the build configuration that supplies the `-nopie` argument. The issue is done when the source of the argument and the reason Clang reports it as unused are documented, with the test command still completing successfully.

Written by the indexing model from the issue text.