[poky] Using non-distro gcc

[Richard Purdie]

On Wed, 2012-02-22 at 16:00 +0800, Chin Huat Ang wrote:
> My Centos 5.6’s gcc is a bit outdated and I’m seeing compiler bugs
> when compiling elfutils-native. As such I’ve rolled my own gcc 4.5.3
> with MPC/MPFR/GMP all installed to /opt, my intention is to make the
> new toolchain self-contained and reusable on other machines/distros.
>  
> The problem is that, in order to use this gcc I will need to set
> LD_LIBRARY_PATH so that it can picks up MPC/MPFR/GMP from /opt. 
>  
> Poky seems to always build with pristine environment (i.e. no
> LD_LIBRARY_PATH), so my new toolchain is unusable. This problem will
> not happen on distro gcc as MPC et al are always installed
> in /usr/lib.
>  
> Is there a way to tell Poky to set LD_LIBRARY_PATH whenever it uses
> the non-distro toolchain? Or is it the right thing to do at all?

You can set "export LD_LIBRARY_PATH=xxx" in your local.conf and that
will make bitbake always set the variable. I'm not sure you can do it
for just the target gcc.

Another alternative would be to put wrapper scripts around your
toolchain binaries and ensure they get found in PATH first and the
scripts setup the environment correctly.
> 
Its certainly possible to make this work but it might require a little
bit of experimentation. I'm surprised your toolchain doesn't set the
RPATHs of the binaries correctly to find the libs its linked to.

Cheers,

Richard