On Sat, Mar 13, 2021 at 4:53 PM Dan Mahoney (Gushi)
<danm@xxxxxxxxxxxxxxx> wrote:
>
> Hey there,
>
> I've just quelled a bunch of obselscence warnings for 2.70/2.71 in
> OpenDMARC, so now I'm looking at the rest of it.
>
> In our project, we're doing the following to detect if we need -lresolv
> (bottom of mail).
...
> So there seems to be a good way to quiesce the need for resolv.h but not
> -lresolv. This feels disjoint. Am I missing something?
There isn't a built-in macro for -lresolv/-lbind, but you could
express MTR's construct more concisely with AC_SEARCH_LIBS:
AC_HEADER_RESOLV
AC_SEARCH_LIBS([res_query], [-lresolv -lbind], [],
[AC_SEARCH_LIBS([__res_query], [-lresolv -lbind], [],
[AC_MSG_ERROR([No resolver library found])])])
AC_SEARCH_LIBS([dn_expand], [-lresolv -lbind], [],
[AC_MSG_ERROR([No resolver library found])])
And then you could follow that up with a single AC_COMPILE_IFELSE with
the test program you're using today, to verify that everything you
need is available.
I would hesitate to add a macro that did this, because I don't know if
programs consistently always need the same functions from libresolv.
zw
