That was very much situation specific.
But the bottomline is the default test does not include <netdb.h> in the test code.
So, pg uses getaddrinfo.c.And the getaddrinfo.c does not work for me.
Ipv6 client authenciation fails.
I have modified the patch.
$ diff -r configure.in configure.in.new
918a919
> AC_MSG_CHECKING([for getaddrinfo])
920c921,926
< AC_REPLACE_FUNCS([getaddrinfo])
---
> AC_TRY_LINK([#include <netdb.h> #include <assert.h>],
> [char (*f)();f=getaddrinfo;],
> ac_cv_func_getaddrinfo=yes, ac_cv_func_getaddrinfo=no)
> if test x"$ac_cv_func_getaddrinfo" = xyes; then
> AC_DEFINE(HAVE_GETADDRINFO,1,[Define if you have the getaddrinfo function])
> fi
923a930
> AC_MSG_RESULT([$ac_cv_func_getaddrinfo])
Rajesh R
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-----Original Message-----
From: Tom Lane [mailto:tgl@sss.pgh.pa.us]
Sent: Monday, January 16, 2006 11:28 PM
To: R, Rajesh (STSD)
Cc: pgsql-hackers@postgresql.org; pgsql-general@postgresql.org
Subject: Re: [GENERAL] [PATCH] Better way to check for getaddrinfo function.
"R, Rajesh (STSD)" <rajesh.r2@hp.com> writes:
> Just thought that the following patch might improve checking for
> getaddrinfo function (in configure.in)
Since AC_TRY_RUN tests cannot work in cross-compilation scenarios, you need an *extremely* good reason to put one in. "I thought this might improve things" doesn't qualify. Exactly what problem are you trying to solve and why is a run-time test necessary? Why doesn't the existing coding work for you?
regards, tom lane <<configure-in.patch>>