Bad typecast `(size_t *) &config.chunk_size` to `(long long *)`

The variable chunk_size, a member of struct config, is declared as a size_t variable in wget_options.h L179-180. A pointer to its place in memory is provided to function parse_numbytes() in options.c L1462. For this function, it is assumed that the memory that opt->var is pointing to has a long long int value (64 bits, cf. options.c L337 and L359) which is always true for struct config members quota, limit_rate and start_pos but not for chunk_size which is not a long long int variable. On 32-bit architectures, size_t has just 32 bits. Depending on the compiler and its optimization strategies, the typecast (long long *) &config.chunk_size might also comprise the first 32 bits of config.quota and it could also be misaligned as can be seen here:

options.c:359:28: runtime error: store to misaligned address 0x00c1d26c for type 'long long int', which requires 8 byte alignment
0x00c1d26c: note: pointer points here
  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00
              ^
Unexpected error code 1, expected 0 [--chunk-size=3]

I am not suggesting how to fix this bug as there are quite a few ways to do so and I don't know which one you would prefer.