Re: beginner question regarding config.in syntax

Welcome on the T2 SDE list :-)

Harmuth, Florian wrote:
> Hello all,
> what files are processed with this rules? (target/dreamcast/config.in):
>
> pkgfilter sed '
>
> # mangle all packages to only build them in the cross stage (1)
> s,^. \(.\)[^ ]*,X \11--------,;
>
> # select some packages (and repositories) explicitely
>
> / 00-dirtree /          { p; d; };
> / linux-header /        { p; d; };
> / binutils /            { s,^. [^ ]*,X 0---------,; p; d; }
> / gcc /                 { s,^. [^ ]*,X 0---------,; p; d; }
>
> / uclibc /              { p; d; };
> / linux26sh /           { p; d; };
>
> / minit /               { p; d; };
> / fgetty /              { p; d; };
>
> / libowfat /            { p; d; };
> / busybox /             { p; d; };
>
> / zlib /                { p; d; };
>
> / ncurses /             { p; d; };
>
> # / iptables /          { p; d; };
> / dropbear /            { p; d; };
> / rsync /               { p; d; };
>
> # / gpm /                       { p; d; };
>
> / strace /              { p; d; };
> # disable the rest
> /.*/                    { s/^X /O / ; p; d; };'
The package metadata / selection is processed with this rules. The raw
listing can be obtained with:

scripts/Create-PkgList x86

But one usually would not do so, despite core script debugging.

Note that modern targets do not use cryptic Unix tool magic for the
selection but rather plain/text files, such as:

target/rescue/pkgsel:

O * # unless otherwise noted below
X 00-dirtree
X sysfiles
...

Where X is select and O deselect. The new rules even allow including
selection templates as the desktop target does:

target/desktop/pkgsel:
# let's reuse a reliable base
include target/generic/pkgsel/50-minimal-desktop.in

Only more complex, purely embedded etc. target still rely on sed
to tweak details, such as to only build the compiler toolchain for
the build host, not the target:

target/embedded/config.in:

...
# we need those for some broken packages that need updating
/ automake /            { s,^. [^ ]*,X 0---------,; p; d; }
/ libtool /             { s,^. [^ ]*,X 0---------,; p; d; }
..
> Sorry for this beginner question, but i don't undestand the build 
> proccess completely.
Any question is welcome, just ask!


--
  René Rebe - ExactCODE GmbH - Europe, Germany, Berlin
  Geschäftsführer: Susanne Klaus, René Rebe
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  http://exactcode.de | http://t2-project.org | http://rene.rebe.name



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