hasmntopt compiler warning

[Ben Walton]

Hi All,

When building coreutils on solaris 10 x86 with warnings as errors, the
mountlist.c code using hasmntopt complains about passing a const char
to a function expecting char. Solaris defines hasmntopt as:

char     *hasmntopt(struct mnttab *, char *);

While it's easy to patch around locally, by doing:

-# define MNT_IGNORE(M) hasmntopt (M, MNTOPT_IGNORE)
+# define MNT_IGNORE(M) hasmntopt (M, (char *) MNTOPT_IGNORE)

This isn't something that is valid to send upstream. I'm not sure what
the cleanest way to handle this is. Should I simply add a conditional
logic to detect Solaris (and later other platforms) that exhibit this
mismatch or is there a better mechanism I should use?

Thanks
-Ben
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