On Wed, Sep 09, 2009 at 10:50:15AM -0700, Mike Markley wrote:
> On Wed, Sep 09, 2009 at 04:46:14PM +0200, Kurt Roeckx <[email protected]> wrote:
> > On Fri, Sep 04, 2009 at 12:35:47AM +0200, Cyril Brulebois wrote:
> > > The problem actually comes from the following:
> > > | AC_SEARCH_LIBS(res_mkquery, resolv)
> >
> > The problem here is that the symbol is not called res_mkquery but
> > __res_mkquery and you need to #include <resolv.h> to get that.
> >
> > On older arches there is a weak alias res_mkquery that gets
> > you __res_mkquery on them for backwards compatibility. I had
> > to fix alot of configure scripts for this issue at the time
> > amd64 got added.
>
> My concern is how cross-platform that is. I work very closely with
> upstream and we're discussing now the best way to accomplish this. The
> code doesn't even call res_mkquery() unless --enable-arlib is set in
> configure (which it isn't in the Debian build), so we're thinking that
> changing the check to something like AC_SEARCH_LIBS(dn_expand, resolv)
> would be more appropriate. Thoughts there?
AC_SEARCH_LIBS is always going to fail:
objdump -T /usr/lib/libresolv.so |grep dn_expand
0000000000005400 g DF .text 0000000000000025 GLIBC_2.2.5 __dn_expand
You need to #include <resolv.h> to get the right name of the
symbol.
Some example patches of things I've send before:
krb5:
+ AC_MSG_CHECKING(for res_search)
+ AC_TRY_LINK_FUNC(res_search, AC_MSG_RESULT(yes),
+ AC_MSG_RESULT(no))
+ saved_LIBS="$LIBS"
+ LIBS="$LIBS -lresolv"
+ AC_MSG_CHECKING(for res_search in -lresolv)
+ AC_LINK_IFELSE([[
+#include <resolv.h>
+int main()
+{
+ res_search (0, 0, 0, 0, 0);
+ return 0;
+}]],
+ LIBS="$LIBS -lresolv"; RESOLV_LIB=-lresolv;
AC_MSG_RESULT(yes),
+ LIBS="$saved_LIBS"; AC_MSG_RESULT(no))
mtr:
AC_CHECK_FUNC(res_mkquery, ,
AC_CHECK_LIB(bind, res_mkquery, ,
- AC_CHECK_LIB(resolv, res_mkquery, , AC_MSG_ERROR(No resolver
library found))))
+ [ saved_LIBS="$LIBS"
+ LIBS="$LIBS -lresolv"
+ AC_MSG_CHECKING(for res_mkquery in -lresolv)
+ AC_TRY_LINK([[#include <resolv.h>]],
+ [[res_mkquery (0, 0, 0, 0, 0, 0, 0, 0, 0);]],
+ LIBS="$saved_LIBS -lresolv"; AC_MSG_RESULT(yes),
+ LIBS="$saved_LIBS"; AC_MSG_RESULT(no)
+ AC_MSG_ERROR(No resolver library found)
+)]))
It should be easy to adapt this to whatever you need.
Kurt
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