/in/foo.c: In function 'bub':
/in/foo.c:4:7: warning: implicit declaration of function 'strl'; did you mean 'strlen'? [-Wimplicit-function-declaration]
    4 | int l=strl(s);
      |       ^~~~
      |       strlen
/usr/bin/ld: /tmp/ccyJIDA5.o: in function `bub':
foo.c:(.text+0xc): undefined reference to `strl'
collect2: error: ld returned 1 exit status