$ cd /tmp/DF-3687 && cc -Wall -O0 -o t odn_negative_level.c
odn_negative_level.c: In function 'main':
odn_negative_level.c:42:11: warning: variable 'input_clk' set but not used [-Wunused-but-set-variable]
  uint32_t input_clk, input_level;
           ^~~~~~~~~
build exit=0