Hi,
Jan Nieuwenhuizen wrote:
> AC_LIB_HAVE_LINKFLAGS is broken for cross building, it looks
> in $prefix/lib, which is usually /usr/lib/, which is usually
> right.
>
> When cross building using a cross compiler for a different
> host root, say /home/janneke/vc/gub/target/mingw/root, things
> go horribly wrong.
The issue is not with cross building or not (test "$cross_compiling" = yes),
but with using a DESTDIR = /home/janneke/vc/gub/target/mingw/root.
See:
- In native compiles without DESTDIR, looking up libraries in $prefix/lib
is desired: The user expects the configuration to find programs that
he has installed earlier with the same --prefix.
- In cross-compiles without DESTDIR (oh yes, that exists: I have done
cross-compiles with --prefix=/cross/sparc64-linux and similar),
looking up libraries in $prefix/lib is desired as well.
- In native compiles with DESTDIR - this mode is typically used by
package distributors that want to make a clear distinction between
the build machine and the end-user's machine, even if the $host is
the same -, looking up libraries in $prefix/lib is undesired.
- In cross-compiles with DESTDIR - your situation - it is undesired
as well.
So, when there is a DESTDIR, looking up libraries in $prefix/lib is
undesired. There is a set of configure option for this:
--without-libxyz-prefix, one for each library libxyz.
For example, gettext's "configure --help" contains:
--without-libpth-prefix don't search for PACKLIBS in includedir and libdir
--without-libiconv-prefix don't search for PACKLIBS in includedir and
libdir
--without-libintl-prefix don't search for PACKLIBS in includedir and
libdir
--without-libglib-2.0-prefix don't search for PACKLIBS in includedir and
libdir
--without-libcroco-0.6-prefix don't search for PACKLIBS in includedir and
libdir
--without-libunistring-prefix don't search for PACKLIBS in includedir and
libdir
--without-libxml2-prefix don't search for PACKLIBS in includedir and
libdir
--without-libncurses-prefix don't search for PACKLIBS in includedir and
libdir
--without-libtermcap-prefix don't search for PACKLIBS in includedir and
libdir
--without-libxcurses-prefix don't search for PACKLIBS in includedir and
libdir
--without-libcurses-prefix don't search for PACKLIBS in includedir and
libdir
--without-libexpat-prefix don't search for PACKLIBS in includedir and
libdir
> suggestion to revert back to AC_CHECK_LIB
This would disable the search in $prefix/lib and $prefix/include for all users,
not only the compilations with DESTDIR. It would be seen as a regression by
the majority of the users.
Whereas for the users in your situation - a minority of the users -, the
desired behaviour is attainable through configure options.
Bruno
--
In memoriam Ilan Ramon <http://en.wikipedia.org/wiki/Ilan_Ramon>
