[avahi] Crosscompiling Avahi onto a uClinux system

[Grant Erickson]

Anthony,

I figured out the libexpat problem. It turns out that when you build
libexpat like:

    cd $(objdir) && \
    $(CURDIR)/$(srcdir)/configure \
    CC=$(CC) AR=$(AR) RANLIB=$(RANLIB) STRIP=$(STRIP) \
    --build=$(build) \
    --host=$(host) \
    --prefix=/usr

and then install/stage it like:

    unset MAKEFLAGS && \
    $(MAKE) -C $(objdir) DESTDIR=$(resultdir) install

You end up with a libexpat.la that specifies "libdir='/usr/lib'". This,
unfortunately, will send Avahi's libtool off into the weeds assuming the
/usr/lib/libexpat.so will satisfy the link requirement. If you're building
on i686 and cross-compiling to ARM, MIPS or PPC, things die right there.

So, expat MUST instead be built like:

    cd $(objdir) && \
    $(CURDIR)/$(srcdir)/configure \
    CC=$(CC) AR=$(AR) RANLIB=$(RANLIB) STRIP=$(STRIP) \
    --build=$(build) \
    --host=$(host) \
    --prefix=$(resultdir)

and then installed/staged like:

    unset MAKEFLAGS && \
    $(MAKE) -C $(objdir) install

Note DESTDIR is removed and replaced, to the same effect, by --prefix.

With that simple change, you can successfully build avahi-daemon and
avahi-autoipd in a cross-compile environment with:

    cd $(objdir) && \
    $(CURDIR)/$(srcdir)/configure \
    CC=$(CC) AR=$(AR) RANLIB=$(RANLIB) STRIP=$(STRIP) \
    CPPFLAGS="-I$(resultdir)../expat/include" \
    LDFLAGS="-L$(resultdir)../expat/lib" \
    LIBDAEMON_CFLAGS="-I$(resultdir)../libdaemon/usr/include " \
    LIBDAEMON_LIBS="-L$(resultdir)../libdaemon/usr/lib -ldaemon" \
    --build=$(build) \
    --host=$(host) \
    --disable-dbus \
    --disable-gdbm \
    --disable-glib \
    --disable-gobject \
    --disable-gtk \
    --disable-manpages \
    --disable-monodoc \
    --disable-python \
    --disable-qt3 \
    --disable-qt4 \
    --enable-libdaemon \
    --with-distro=none \
    --with-xml=expat \
    --prefix=/usr \
    --sysconfdir=/etc \
    --localstatedir=/var

and install/stage it with:

    unset MAKEFLAGS && \
    $(MAKE) -C $(objdir) DESTDIR=$(resultdir) install

and will end up with the following in $(resultdir):

    etc/
    etc/avahi/
    etc/avahi/avahi-autoipd.action
    etc/avahi/avahi-dnsconfd.action
    etc/avahi/hosts
    etc/avahi/services/
    etc/avahi/services/sftp-ssh.service
    etc/avahi/services/ssh.service
    etc/avahi/avahi-daemon.conf
    usr/
    usr/include/
    usr/include/avahi-core/
    usr/include/avahi-core/log.h
    usr/include/avahi-core/lookup.h
    usr/include/avahi-core/core.h
    usr/include/avahi-core/rr.h
    usr/include/avahi-core/publish.h
    usr/include/avahi-common/
    usr/include/avahi-common/cdecl.h
    usr/include/avahi-common/llist.h
    usr/include/avahi-common/error.h
    usr/include/avahi-common/rlist.h
    usr/include/avahi-common/timeval.h
    usr/include/avahi-common/gccmacro.h
    usr/include/avahi-common/thread-watch.h
    usr/include/avahi-common/address.h
    usr/include/avahi-common/simple-watch.h
    usr/include/avahi-common/malloc.h
    usr/include/avahi-common/domain.h
    usr/include/avahi-common/strlst.h
    usr/include/avahi-common/alternative.h
    usr/include/avahi-common/defs.h
    usr/include/avahi-common/watch.h
    usr/share/
    usr/share/locale/
    usr/share/locale/de/
    usr/share/locale/de/LC_MESSAGES/
    usr/share/locale/de/LC_MESSAGES/avahi.mo
    usr/share/man/
    usr/share/man/man8/
    usr/share/man/man1/
    usr/share/man/man5/
    usr/share/avahi/
    usr/share/avahi/avahi-service.dtd
    usr/share/avahi/service-types
    usr/share/avahi/introspection/
    usr/share/applications/
    usr/sbin/
    usr/sbin/avahi-dnsconfd
    usr/sbin/avahi-daemon
    usr/sbin/avahi-autoipd
    usr/lib/
    usr/lib/libavahi-core.so.5.0.4
    usr/lib/libavahi-common.la
    usr/lib/libavahi-core.la
    usr/lib/libavahi-common.so.3
    usr/lib/libavahi-core.so
    usr/lib/libavahi-core.a
    usr/lib/libavahi-common.so.3.5.0
    usr/lib/avahi/
    usr/lib/libavahi-common.a
    usr/lib/pkgconfig/
    usr/lib/pkgconfig/avahi-core.pc
    usr/lib/libavahi-common.so
    usr/lib/libavahi-core.so.5
    usr/bin/
    var/
    var/run/

Good luck!

Regards,

Grant
Principal
Nuovation System Designs, LLC