glibc and getgrouplist

[Roland Illig]

Pavel Tsekov wrote:
> Hello,
> 
> On Thu, 21 Jul 2005, Leonard den Ottolander wrote:
> 
> 
>>How does one test for the availability of glibc in configure.ac, and for
>>glibc's version next?
> 
> 
> Please, don't do this. The check should be made at runtime and not
> configure time. Andrew's approach seems better to me. And it is not only
> 2.3.2 - also other versions are affected:

What about this?

#ifndef HAVE_GNU_GET_LIBC_VERSION
#  define may_use_getgrouplist() (TRUE)
#else
#  include <gnu/libc-version.h>
#  define may_use_getgrouplist() \
         (strcmp(gnu_get_libc_version(), "2.3.3") > 0)
#endif

Roland