Re: _GNU_SOURCE

Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> writes:
> Jeroen Ruigrok/asmodai wrote:
>> "The crypt_r function is a GNU extension."

> BSD/OS doesn't have crypt_r(), and crypt() manual page says:

> The crypt() function may not be safely called concurrently from multiple
> threads, e.g., the interfaces described by pthreads(3).

Right. But whether crypt is re-entrant or not isn't really the issue
here. The problem is that the standard RHL 8 version of Perl is
installed in such a way that <perl.h> fails to compile unless crypt_r's
struct typedef is visible. I have not looked, but I surmise this must
mean that they configured Perl with _GNU_SOURCE defined. Maybe it was
done so Perl could get at crypt_r, but more likely it was for some other
reasons altogether ...

regards, tom lane