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Re: autoconf breakage on x86_64.



Sam Varshavchik napsal(a):
> I don't know the right way to fix this, but something is definitely
> broken; and something needs to be fixed, one way or the other.  The
> question is what exactly needs to be fixed.

> LIBS="-lresolv $LIBS"
> AC_TRY_LINK_FUNC(res_query, AC_MSG_RESULT(yes), AC_MSG_RESULT(no))

> /tmp/ccW7EeDX.o(.text+0x7): In function `main':
> /home/mrsam/src/courier/authlib/configure:5160: undefined reference to
> `res_query'

> The reason appears to be that you have to #include <resolv.conf> on
> x86_64 in order to succesfully pull res_query() out of libresolv.so. 
> You don't need to do this on x86, and the test program generated by
> AC_TRY_LINK_FUNC does not include any headers, but uses a manual prototype.
> 
> So, what now?
Fetchmail uses this (after checking for the presence of the necessary
header files):

|     AC_LINK_IFELSE([AC_LANG_PROGRAM([[
| #include <sys/types.h>
| #ifdef HAVE_NETINET_IN_H
| #include <netinet/in.h>
| #endif
| #ifdef HAVE_ARPA_NAMESER_H
| #include <arpa/nameser.h>
| #endif
| #ifdef HAVE_RESOLV_H
| #include <resolv.h>
| #endif
| extern int res_search();
| ]], [[res_search(0, 0, 0, 0, 0);]])],
|     [AC_MSG_RESULT([found])
|      AC_DEFINE(HAVE_RES_SEARCH, [1],
|                [Define to 1 if you have the 'res_search' function.])
|      break], [AC_MSG_RESULT([not found])])

	Mirek


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