From: Corinna Vinschen
> It doesn't matter what you use, it matters what the function expects.
> lseek expects off_t per POSIX:
>
> http://pubs.opengroup.org/onlinepubs/9699919799/functions/lseek.html
>
> and off_t is defined as 64 bit type.
After adding the missing unistd.h and return statements, gcc -Wall still
complains:
x.c: In function ‘main’:
x.c:12:2: warning: format ‘%d’ expects argument of type ‘int’, but argument 2
has type ‘off_t’ [-Wformat=]
printf("pos = %d\n",lseek(f, 0l, SEEK_CUR));
^
x.c:12:2: warning: format ‘%d’ expects argument of type ‘int’, but argument 2
has type ‘off_t’ [-Wformat=]
So, then, after changing %d to %lld, gcc -Wall -pedantic complains:
x.c: In function ‘main’:
x.c:12:2: warning: ISO C90 does not support the ‘ll’ gnu_printf length modifier
[-Wformat=]
printf("pos = %lld\n",lseek(f, 0l, SEEK_CUR));
^
x.c:12:2: warning: ISO C90 does not support the ‘ll’ gnu_printf length modifier
[-Wformat=]
Wondering how to printf an off_t value without the compiler complaining while
using -Wall -pedantic.
--Ken Nellis
