[gobo-eiffel-develop] NGROUPS_MAX

[Franck A. <fr...@ne...>]

hi,

I can't bootstrap the current repository, fails on compiling
eif_group_in_list because my Linux does not have NGROUPS_MAX (or not in
the expected place).

It seems NGROUPS_MAX was changed to 65000 from 32 between Linux kernel
releases so the hardcoded NGROUPS_MAX technique not very reliable as the
value depend on C library on the compiling machine and real value on
kernel.

I guess the clean way is to malloc () the structure with the value
returned by getgroups (0, _) which returns the actual number of items
without touching the output array. Some POSIX page recommends a sysconf
call but the former seems simpler.