On Sunday, 23 June 2019 at 15:34:40 UTC, Newbie2019 wrote: > Is this a bugs ? or the _tlsstart/_tlsend is some symbols > import from android system lib ? These 2 symbols are inserted by the compiler into the object file containing the D main function, see https://run.dlang.io/is/QDwmHM. What triple are you using? Make sure there's an `-android` at the end.