cpu/native/periph_timer: add missing -lrt to linker flags

[maribu]

Contribution description

This (hopefully) fixes #20009 (comment)

Testing procedure

E.g. make BOARD=native64 -C tests/periph/timer should now work on Debian 11.

Issues/PRs references

#20009 (comment)

[maribu]

Debian 11 on master:

make BOARD=native64 -C tests/periph/timer
make: Entering directory '/home/maribu/RIOT/tests/periph/timer'
Building application "tests_timer" for "native64" with CPU "native".

"make" -C /home/maribu/RIOT/boards/common/init
"make" -C /home/maribu/RIOT/boards/native64
"make" -C /home/maribu/RIOT/boards/native
"make" -C /home/maribu/RIOT/boards/native/drivers
"make" -C /home/maribu/RIOT/core
"make" -C /home/maribu/RIOT/core/lib
"make" -C /home/maribu/RIOT/cpu/native
"make" -C /home/maribu/RIOT/cpu/native/periph
"make" -C /home/maribu/RIOT/cpu/native/stdio_native
"make" -C /home/maribu/RIOT/drivers
"make" -C /home/maribu/RIOT/drivers/periph_common
"make" -C /home/maribu/RIOT/sys
"make" -C /home/maribu/RIOT/sys/auto_init
"make" -C /home/maribu/RIOT/sys/isrpipe
"make" -C /home/maribu/RIOT/sys/libc
"make" -C /home/maribu/RIOT/sys/preprocessor
"make" -C /home/maribu/RIOT/sys/test_utils/interactive_sync
"make" -C /home/maribu/RIOT/sys/test_utils/print_stack_usage
"make" -C /home/maribu/RIOT/sys/tsrb
/usr/bin/ld: /home/maribu/RIOT/tests/periph/timer/bin/native64/periph/timer.o: in function `timer_start':
/home/maribu/RIOT/cpu/native/periph/timer.c:205: undefined reference to `timer_settime'
/usr/bin/ld: /home/maribu/RIOT/tests/periph/timer/bin/native64/periph/timer.o: in function `timer_stop':
/home/maribu/RIOT/cpu/native/periph/timer.c:218: undefined reference to `timer_settime'
/usr/bin/ld: /home/maribu/RIOT/tests/periph/timer/bin/native64/periph/timer.o: in function `timer_init':
/home/maribu/RIOT/cpu/native/periph/timer.c:117: undefined reference to `timer_create'
/usr/bin/ld: /home/maribu/RIOT/cpu/native/periph/timer.c:124: undefined reference to `timer_delete'
collect2: error: ld returned 1 exit status
make: *** [/home/maribu/RIOT/tests/periph/timer/../../../Makefile.include:737: /home/maribu/RIOT/tests/periph/timer/bin/native64/tests_timer.elf] Error 1
make: Leaving directory '/home/maribu/RIOT/tests/periph/timer'

Debian 11 with this PR:

make BOARD=native64 -C tests/periph/timer
make: Entering directory '/home/maribu/RIOT/tests/periph/timer'
Building application "tests_timer" for "native64" with CPU "native".

"make" -C /home/maribu/RIOT/boards/common/init
"make" -C /home/maribu/RIOT/boards/native64
"make" -C /home/maribu/RIOT/boards/native
"make" -C /home/maribu/RIOT/boards/native/drivers
"make" -C /home/maribu/RIOT/core
"make" -C /home/maribu/RIOT/core/lib
"make" -C /home/maribu/RIOT/cpu/native
"make" -C /home/maribu/RIOT/cpu/native/periph
"make" -C /home/maribu/RIOT/cpu/native/stdio_native
"make" -C /home/maribu/RIOT/drivers
"make" -C /home/maribu/RIOT/drivers/periph_common
"make" -C /home/maribu/RIOT/sys
"make" -C /home/maribu/RIOT/sys/auto_init
"make" -C /home/maribu/RIOT/sys/isrpipe
"make" -C /home/maribu/RIOT/sys/libc
"make" -C /home/maribu/RIOT/sys/preprocessor
"make" -C /home/maribu/RIOT/sys/test_utils/interactive_sync
"make" -C /home/maribu/RIOT/sys/test_utils/print_stack_usage
"make" -C /home/maribu/RIOT/sys/tsrb
   text	  data	   bss	   dec	   hex	filename
  27536	  5870	 58912	 92318	 1689e	/home/maribu/RIOT/tests/periph/timer/bin/native64/tests_timer.elf
make: Leaving directory '/home/maribu/RIOT/tests/periph/timer'

[riot-ci]

Murdock results

✔️ PASSED

29a00be cpu/native/periph_timer: add missing -lrt to linker flags

Success	Failures	Total	Runtime
10198	0	10198	15m:03s

Artifacts

• Documentation preview

[chrysn]

Thanks for fixing this super fast.

I've verified that the only code using the offending function (that I know) is periph_timer on native, and trust your tests.

[maribu]

Thx a bunch!

[maribu]

Backport provided in #20819