tests: broken with stdio_rtt if auto_init is disabled #13120
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Description
Description
Some tests disable auto_init (and thus xtimer's initialization).
xtimer is a hard dependency when using stdio_rtt, thus all tests disabling auto_init fail, unless they manually initialize xtimer.
Probably affected:
$ git grep DIS.*auto
bloom_bytes/Makefile:DISABLE_MODULE += auto_init
cpp_ctors/Makefile:DISABLE_MODULE += auto_init
driver_at86rf2xx/Makefile:DISABLE_MODULE += auto_init
float/Makefile:#DISABLE_MODULE += auto_init
gnrc_sixlowpan_frag/Makefile:DISABLE_MODULE += auto_init
lwip_sock_ip/Makefile:DISABLE_MODULE += auto_init
lwip_sock_tcp/Makefile:DISABLE_MODULE += auto_init
lwip_sock_udp/Makefile:DISABLE_MODULE += auto_init
minimal/Makefile:DISABLE_MODULE += auto_init
msg_avail/Makefile:DISABLE_MODULE += auto_init
mutex_unlock_and_sleep/Makefile:DISABLE_MODULE += auto_init
netdev_test/Makefile:DISABLE_MODULE = auto_init
periph_rtt/Makefile:DISABLE_MODULE += auto_init
posix_semaphore/Makefile:DISABLE_MODULE += auto_init
shell/Makefile:DISABLE_MODULE += auto_init
socket_zep/Makefile:DISABLE_MODULE += auto_init
struct_tm_utility/Makefile:DISABLE_MODULE += auto_init
thread_basic/Makefile:DISABLE_MODULE += auto_init
thread_cooperation/Makefile:DISABLE_MODULE += auto_init
thread_exit/Makefile:DISABLE_MODULE += auto_init
thread_flood/Makefile:DISABLE_MODULE += auto_init
thread_msg/Makefile:DISABLE_MODULE += auto_init
thread_msg_block_race/Makefile:DISABLE_MODULE += auto_init
thread_msg_block_w_queue/Makefile:DISABLE_MODULE += auto_init
thread_msg_block_wo_queue/Makefile:DISABLE_MODULE += auto_init
thread_msg_seq/Makefile:DISABLE_MODULE += auto_init
thread_race/Makefile:DISABLE_MODULE += auto_init
thread_zombie/Makefile:DISABLE_MODULE += auto_init
unittests/Makefile:DISABLE_MODULE += auto_init
Probably minus these that manually initialize xtimer:
$ for i in $(git grep -l DIS.*auto | xargs dirname); do git grep "xtimer_init" $i/*.c; done
bloom_bytes/main.c: xtimer_init();
driver_at86rf2xx/main.c: xtimer_init();
gnrc_sixlowpan_frag/main.c: xtimer_init();
lwip_sock_ip/stack.c: xtimer_init();
lwip_sock_tcp/main.c: xtimer_init();
lwip_sock_tcp/stack.c: xtimer_init();
lwip_sock_udp/main.c: xtimer_init();
lwip_sock_udp/stack.c: xtimer_init();
posix_semaphore/main.c: xtimer_init();
shell/main.c: xtimer_init();
unittests/main.c: xtimer_init();
Steps to reproduce the issue
Run any of the above tests with a board configured to use stdio_rtt.
Expected results
Test succeeds.
Actual results
Varying, as apparently the stdio_rtt code only falls back to periodic polling on read or write after empting either input or output queue. But the tests I tried just get stuck, mostly after printing the interactive_sync info line.