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Re: Weak symbols in libresolv?

From: Niels M철ller
Subject: Re: Weak symbols in libresolv?
Date: 09 May 2002 01:01:26 +0200
User-agent: Gnus/5.09 (Gnus v5.9.0) Emacs/21.2

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).


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