Description

The build process is aborted before compilation if the specified programmer is not connected whenever the debugger serial is specified, even when the build command is only for compilation without flashing.

Steps to reproduce the issue

make -C examples/hello-world BOARD=samr21-xpro SERIAL=ATML211234567

Expected results

No errors, hello-world.elf built.

Even when flashing the process should first build the binary and only complain if the debugger is not connected when it comes to the flashing step.

Actual results

make: Entering directory '.../RIOT/examples/hello-world'
.../RIOT/makefiles/boards/sam0.inc.mk:13: *** Did not find a device with serial ATML211234567.  Stop.
make: Leaving directory '.../RIOT/examples/hello-world'

Versions

latest master (98f42ee)
GNU Make 4.2.1