cmake HAVE_MBRLEN examples

arkdb/inception cmake/readline.cmake :38 

CHECK_FUNCTION_EXISTS(mbrlen HAVE_MBRLEN)

alibaba/AliSQL cmake/readline.cmake :40 

CHECK_FUNCTION_EXISTS(mbrlen HAVE_MBRLEN)

Tokutek/mysql-5.5 cmake/readline.cmake :38 

CHECK_FUNCTION_EXISTS(mbrlen HAVE_MBRLEN)