Re: Weak symbols in libresolv?

[Niels Möller]

Roland McGrath <roland@frob.com> writes:

> resolv.h #define's those symbols to the __ names, so anything
> compiled with the current resolv.h ought to use the __ names
> directly.

I'm sure you're aware that such name mangling makes a standard autoconf
tests like

  AC_CHECK_LIB(resolv, res_query)

fail, as the configure script will try to link with the symbol without
including resolv.h. The test must be rewritten as

  AC_CHECK_LIB(resolv, __res_query)

(Unless autoconf has been hacked since I had the same problem when
upgrading to GMP-3.0, which uses similar name mangling defines like
#define mpz_foo __gmpz_foo).

/Niels