[Ltib] Re: add -DZ_PREFIX

[Stuart Hughes]

Hi Henry, 

There is information on pkg-config here:
http://pkg-config.freedesktop.org/wiki/
but basically when set up right, when a package build needs interface
headers/libraries from another package it can run pkg-config queries to
find out where and what headers/libraries it needs to use in it
compile/link command lines.

Normally this doesn't work properly when cross compiling, but I've added
a patch in LTIB so that it does (see pkgconfig.spec :
pkg-config-0.21-prefix_mungling.patch).  This in conjunction with the
spoofing system means that pkg-config works without having to do
anything special while building within LTIB.  This has been tested when
I did the original work to get the gstreamer set of packages to build
properly.

The only caveat is that you'll need a recent LTIB to get hold of this,
it's not yet available in the Savannah CVS copy (but I will be merging
out soon).

Regards, Stuart

On Wed, 2007-10-31 at 10:59 -0700, hong zhang wrote:
> Stuart,
> 
> I think Z_PREFIX is not needed any more for compiling
> DirectFB. Trouble is I really not quite understand
> pkg_conifg for. Do you know where is information about
> it so that I can learn it?
> 
> ---henry
> 
> --- Stuart Hughes <address@hidden> wrote:
> 
> > Hi Henry,
> > 
> > Are you using the LTIB from an iso image, if so what
> > version? or are you
> > using the version from bitshrine/savannah?  The
> > reason I ask is that I
> > pending merge out to bitshrine/savannah that makes
> > pkg_config work
> > properly in a cross compiled environment and
> > possibly that will help you
> > (you won't need to specify the pkg_config files on
> > configure line).  If
> > you have a recent Freescale ISO it will already have
> > these updates.
> > 
> > I didn't understand your question about Z_PREFIX ?
> > 
> > Regards, Stuart
> > 
> > On Wed, 2007-10-31 at 09:45 -0700, hong zhang wrote:
> > > Stuart,
> > > 
> > > After adding
> > > LIBPNG_CONFIG="$(HOST_DIR)/bin/libpng12-config" \
> > >  and DirectFB build successfully with
> > > --with-gfxdrivers=none. But still have error
> > without
> > > --with-gfxdrivers=none.
> > > 
> > > Why do you think Z_PREFIX will be turned on
> > default?
> > > 
> > > ---henry
> > > 
> > > --- Stuart Hughes <address@hidden> wrote:
> > > 
> > > > Hi Henry,
> > > > 
> > > > LTIB will find the headers in rootfs in
> > preference
> > > > to the toolchain.
> > > > 
> > > > To add this flag, it would probably work by
> > changing
> > > > the spec file to:
> > > > 
> > > > CFLAGS="-DZ_PREFIX" \
> > > > ./configure --enable-shared --host=$CFGHOST
> > > > --build=%{_build} \
> > > > ....
> > > > 
> > > > What does this flag do, and do you know why the
> > > > things it turns on in
> > > > zconf.h are not enabled by default?
> > > > 
> > > > Regards, Stuart
> > > > 
> > > > On Tue, 2007-10-30 at 15:27 -0700, hong zhang
> > wrote:
> > > > > Stuart,
> > > > > 
> > > > > I want to add -DZ_PREFIX to turn on inside
> > > > zconf.h.
> > > > > Where should I add  -DZ_PREFIX  in
> > DirectFB.spec?
> > > > > 
> > > > > When I upgrade zlib and I found library header
> > > > files
> > > > > in toolchain is not upgraded and rootfs is
> > > > upgraded.
> > > > > 
> > > > > Thanks.
> > > > > 
> > > > > ---henry
> > > > > 
> > > > >
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