Firmware building fails

Hello,

I’ve written a small application with source file ‘20190215.c’ (like the px4_simple_app in dev.px4.io), I created a CMakeLists.txt and I’ve added the application to the default.cmake (SITL)
but the firmware build (make px4_sitl jmavsim) fails because off an 'invalid suffix _main" in my source file:

__EXPORT int 20190215_main(int argc, char *argv[]);

Anyone has an idea what I’m doing wrong ?

Cheers,
Hans

__EXPORT int 20190215_main(int argc, char *argv[]);