*Starts compile*
...
...
can't find function foo
ld exited with status code 1

*confused*
*Reruns qmake*
*Compiles again*
...
...
can't find function foo
ld exited with status code 1

*very confused*
*switches compilers*
*compiles*
...
...
Worked!

*dafuq*
*switches back to the first compiler*
*compiles*
...
...
Worked!

*tries not to cry*