Custom Parser does not work with CMake projects

Pattern:

file://(.*):(\d+): (.*)

And positions 1, 2, 3.

in CMakeLists.txt:

add_custom_target(custom ALL echo "file:///tmp/j.foo:123: some error")
message("file:///tmp/j.foo:123: some error")

Neither of these messages is recognized. This seems to work fine in qmake projects.