[mythtv] Linux to MacOSX cross compilation

[Lawrence Rust]

On Tue, 2011-03-08 at 12:57 -0800, Emlyn Bolton wrote:
>         > I wonder how hard it would be to use the existing Mac
>         packaging script
>         > to get these to bundle into a MythFrontend.app/ directory?
>         >
>         > Once I've compiled, I'll have a look... If nobody else is
>         already
>         > doing so?
>         
>         
>         Great idea. Please give it a try.
>  
> Alas, it did not work.  While attempting to package up the contents,
> it complained about some of the binary formats of some of the
> libraries.

You might need to use the odcctools to package them, specifically ld.
See man /opt/mac/share/man/man1/ld.1 (assuming that you installed
odcctools to the default /opt/mac) and search for -bundle

>   I tried executing the unpacked build area files to my Tiger
> installation, but couldn't figure out how to change the runtime-prefix
> at runtime... Is that possible?

Quite possibly.  The mythbuild.sh script gives a hint when it has
finished building.  If the installation is moved then prepend the
following to the myth command:

LD_LIBRARY_PATH="<path>/lib:<path>/lib/mysql" QT_PLUGIN_PATH="<path>/plugins"

>  To be clearer, my build area (linux box)
> is /home/emlyn/mythbuilder/mythinstall but I wanted to run it and
> otool the binaries on my mac (/Users/emlyn/mythbuilder) it will look
> for the build area libs / bins, even if I manually specify the libs to
>  the osx-bundler.sh script.

For your case:

build="/Users/emlyn/mythbuilder/mythinstall"
LD_LIBRARY_PATH="$build/lib:$build/lib/mysql" \
QT_PLUGIN_PATH="$build/plugins" $build/bin/mythfrontend

This depends on the Mac's ld.so supporting LD_LIBRARY_PATH, of which I'm
not certain.  Can anyone confirm this?

It may be necessary to re-run mythbuild.sh in a chroot environment and
specify the correct installation prefix:

mkdir ~/mac
# cp or ln -s your existing mythbuilder folder into ~/mac
chroot ~/mac mythbuild.sh -I /usr

Everything will be installed into ~/mac/usr but will expect to be run
from /usr

-- Lawrence