[help-gengetopt] longlong not working

[Simon Josefsson]

Hi.  In OATH Toolkit I started to use the 'longlong' feature recently,
to be able to specify 64-bit integers.  However I noticed that it
doesn't really work well.  There are two reasons for this:

1) The generated code use the HAVE_LONG_LONG pre-processor symbol to
check whether 'long long' is available.  I didn't have that symbol
defined, I did have HAVE_LONG_LONG_INT defined via gnulib.  This issue
could be resolved with improved documentation, stating that you need to
make sure HAVE_LONG_LONG is defined when building.

2) The generated code uses 'strtol' to convert values.  This function
does not handle larger values.  The code looks like this:

#ifdef HAVE_LONG_LONG
    if (val) *((long long int*)field) = (long long int) strtol (val,
&stop_char, 0);
#else
    if (val) *((long *)field) = (long)strtol (val, &stop_char, 0);
#endif

Changing 'strtol' to 'strtoll' works.  I'm guessing platforms with 'long
long' have 'strtoll' as well, but I can't guarantee it.

/Simon