^CMake Error at .*/Modules/CheckIPOSupported\.cmake:[0-9]+ \(message\):
  IPO is not supported \(language\(s\) 'UnknownLanguage' not supported\)\.
Call Stack \(most recent call first\):
  .*/Modules/CheckIPOSupported\.cmake:[0-9]+ \(_ipo_not_supported\)
  user-lang-unknown\.cmake:[0-9]+ \(check_ipo_supported\)
  CMakeLists\.txt:[0-9]+ \(include\)$