[maemo-developers] Cross compiling under debian

[From: Sebastian Mancke]

Hi,

compiling my packages with Java-JNI-code (e.g. classpath) for maemo does
not work out of the box, because scratchbox does not have all the
required build tools (javac, javah, jar). My long-term goal would be to
use openembedded, but this will need much work, I think.

So, at the moment I cross compile from my x86 debian, which seems to
work fine except of the following problems with the debian packaging:

1. dh_strip -a (from x86) does not know, how to handle the arm binaries.
(I have disabled it with: DEB_BUILD_OPTIONS=nostrip)

2. dh_shlibdeps does not work, because the ldd (from the toolchain)
tries to use ld-linux.so.3 from my host instead from the rootstrap.
/home/asteban/maemo/toolchain/scratchbox/compilers/arm-linux-2006q3-27/arm-none-linux-gnueabi/libc/usr/bin/ldd:
line 166: /lib/ld-linux.so.3: No such file or directory

3. dpkg-architecture does not know 'arml'
It would be possible to hack a fix in the script, like the one in
scratchbox:
sub debian_arch_fix
{
    local ($os, $cpu) = @_;
    ...
    } elsif ("$os-$cpu" eq "gnueabi-linux-arm") {
        return "armel";
    ...
}

The problem 2. is my biggest one. Any suggestions? Cleaner solutions?


My setup is as follows:

TOOLCHAIN=~/maemo/toolchain/scratchbox
ROOTSTRAP=~/maemo/toolchain/rootstrap
export
PATH=$TOOLCHAIN/compilers/arm-linux-2006q3-27/bin/:$TOOLCHAIN/compilers/arm-linux-2006q3-27/arm-none-linux-gnueabi/libc/usr/bin/:$PATH
export CC=`which arm-none-linux-gnueabi-gcc`
export LD=`which arm-none-linux-gnueabi-ld`
export AR=`which arm-none-linux-gnueabi-ar`
export PKG_CONFIG_PATH=$ROOTSTRAP/usr/lib/pkgconfig/
alias pkg-config='pkg-config --define-variable=prefix=$ROOTSTRAP/usr'

# no a nice soution
export DEB_BUILD_OPTIONS=nostrip

Then I simply run 'fakeroot dpkg-buildpackage -d'


Regards,
  Sebastian

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