Hi
on a second thought, the cast is useless:
if I have a function
f(char **argv)
that passes argv to a function
g(char * const *argv)
there's no need to cast, since this does not issue any warning: I can
pass something not const to something that expects something cost, can't
I? It is the other way round which does not work...
am I right?
cheers
Lorenzo
Sergey Poznyakoff wrote:
Hi Lorenzo,
the
char * const *argv
libc declaration of getopt_long (which looks wrong, since argv might
be changed during the parsing, right?)
Yes, it is wrong because argv might be permuted by getopt_long. And
that's why gnulib's implementation uses __getopt_argv_const in the
declaration (see the comment in lib/getopt.in.h:73).
now, I'd like to avoid the warning in the generated parser when using
gnulib, but I'd like to avoid it also when using libc getopt_long
version...
what would you suggest?
I believe typecasting to `char *__getopt_argv_const *___argv' would be
the best way to handle this. Keep in mind, though, that
__getopt_argv_const is a macro, which is defined only if you include
gnulib's version of getopt.h. Perhaps some additional #ifdef magic
would be required before the cast, e.g.:
#ifndef __getopt_argv_const
# define __getopt_argv_const const
#endif
Regards,
Sergey
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