CMake Error at BadIF.cmake:2 \(add_custom_target\):
  Error evaluating generator expression:

    \$<IF:asdf,a,b>

  First parameter to \$<IF> must resolve to exactly one '0' or '1' value.
Call Stack \(most recent call first\):
  CMakeLists.txt:3 \(include\)
+
CMake Error at BadIF.cmake:2 \(add_custom_target\):
  Error evaluating generator expression:

    \$<IF:asdf,a>

  \$<IF> expression requires 3 comma separated parameters, but got 2 instead.