[yocto] specify compiler version in recipe

[Khem Raj]

> On Sep 21, 2015, at 7:47 PM, Trevor Woerner <twoerner at gmail.com> wrote:
> 
> Hello,
> 
> It looks like I already know the answer to this one... ;-)
> 
> I'm guessing it isn't possible to specify the compiler version in a
> recipe? That's probably way too late in the parse stage?
> 
> There are some vendor Linux kernels for some BSPs that are old enough to
> pre-date the:
> 
>    fatal error: linux/compiler-gcc5.h: No such file or directory

back port the needed patch from upstream kernel. No other solution will be comprehensive.

> 
> issue. Which means we have to rely on users reading the README and
> updating their conf/local.conf files to include
> 
>    GCCVERSION = "4.9%"
> 
> Unfortunately that process is error-prone. It would be great to have
> that occur automatically. In other words: if you want to use the
> community/default/upstream kernel then use the latest compiler (but you
> won't have accelerated graphics). If you want accelerated graphics then
> you have to PREFER an older kernel *and* specify which version of gcc to
> use in your conf/local.conf.
> 
> Can anyone think of a clever trick for this one?
> 
> Are BSP maintainers patching their old kernels to support post-gcc-5.0
> versions?
> 
> Best regards,
>    Trevor
> -- 
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