[yocto] Control which host components are included in ADT output?

[Zhang, Jessica]

Hi Evade,

The main purpose of Yocto ADT is for setting up a development environment on your host which allows you to cross develop applications for your target.  And there're two key components help you to achieve this: cross-toolchain and sysroot. That's why the sysroot provides you a collection of target libs and all the main focus of ADT manual is for how to customize your sysroot to meet your special development needs.

Seems you're more interested in generate a SDK for host?

Thanks,
Jessica

-----Original Message-----
From: yocto-bounces at yoctoproject.org [mailto:yocto-bounces at yoctoproject.org] On Behalf Of Evade Flow
Sent: Tuesday, October 09, 2012 3:11 PM
To: yocto at yoctoproject.org
Subject: [yocto] Control which host components are included in ADT output?

I have a question about the ADT and how it selects host SDK components.
If I type:

% bitbake meta-toolchain-sdk

I wind up getting hundreds of target libs when I extract the generated
tarball:

% pwd
/opt/poky/1.2.1/sysroots
% ls armv5te-poky-linux-gnueabi/usr/lib | wc -l
696

but a relatively small number of host libs:

% ls i686-pokysdk-linux/usr/lib | wc -l
53

Is this normal? Taking libxml2 as an example:

% ls -1 armv5te-poky-linux-gnueabi/usr/lib/libxml*
armv5te-poky-linux-gnueabi/usr/lib/libxml2.la
armv5te-poky-linux-gnueabi/usr/lib/libxml2.so
armv5te-poky-linux-gnueabi/usr/lib/libxml2.so.2
armv5te-poky-linux-gnueabi/usr/lib/libxml2.so.2.7.8
% ls -1 i686-pokysdk-linux/usr/lib/libxml*
zsh: no matches found: i686-pokysdk-linux/usr/lib/libxml*

It seems desirable to have libxml2 be part of the SDK I give to my development team. We have a lot of test applications that can be run on the host, and I don't like the thought of somebody wasting time chasing a bug that turns out to be due to the fact that he is linking against a different (system-installed) version of libxml2 rather than the target version.

Skimming the ADT manual, this section seems to hint at a solution:

 - http://www.yoctoproject.org/docs/current/adt-manual/adt-manual.html#adt-package

But I can't quite follow all the steps. :-% It says (using libglade as an example):

  First, you should generate the ipk file for the libglade package and
  add it into a working opkg repository. Use these commands:

    $ bitbake libglade
    $ bitbake package-index


Being totally new to opkg, this lost me. What does the 'package-index'
target actually do?  Does bitbake "add it [libglade] into a working opkg repository" for me, or am I supposed to take the output of the command and do something with it? I had a look in these two locations for 'package-index' and came up empty:

 - http://www.yoctoproject.org/docs/current/dev-manual/dev-manual.html
 - http://www.yoctoproject.org/docs/current/poky-ref-manual/poky-ref-manual.html

What's the best place to look for these kinds of references when I get stuck on something?

The ADT docs go on to say:

  Next, source the environment setup script found in the Yocto Project
  files. Follow that by setting up the installation destination to point
  to your sysroot as <sysroot_dir>. Finally, have an OPKG configuration
  file <conf_file> that corresponds to the opkg repository you have just
  created.

     $ opkg-cl -f <conf_file> -o <sysroot_dir> update
     $ opkg-cl -f <cconf_file> -o <sysroot_dir> \
        --force-overwrite install libglade
     $ opkg-cl -f <cconf_file> -o <sysroot_dir> \
        --force-overwrite install libglade-dbg
     $ opkg-cl -f <conf_file> -o <sysroot_dir> \
        --force-overwrite install libglade-dev

<sysroot_dir> I understand, but what is <conf_file>? Did bitbake generate this for me? Am I supposed to create one by hand? Where? These instructions are a little hard to follow due to the use of placeholders rather than concrete arguments. I think a complete, explicit example would help a lot here.

Also, it seems likely that the above commands would only install a libglade compiled for the target? How would I generate a libglade for the host?

Another question is: is there a way to tune the ADT tarball to be a better fit for my needs so that I don't need to add so many packages by hand after-the-fact?

Any advice much appreciated, thanks!
_______________________________________________
yocto mailing list
yocto at yoctoproject.org
https://lists.yoctoproject.org/listinfo/yocto