[yocto] Switching between stable gcc versions

[Khem Raj]

On Aug 2, 2012, at 11:37 PM, Elvis Dowson <elvis.dowson at gmail.com> wrote:

> Hi,
>      In poky master, the current version of gcc is 4.7.2. If I have a situation, where I need to revert back to using gcc-4.5.1, how can I do this cleanly? 
> 
> Perhaps some of the issues that I'm facing with getting my root filesystem image booting on my Xilinx ML507 development board (Virtex 5 PowerPC 440 processor) might be related the new gcc-4.7.2 release.


I think you should really debug it. such statements are very coarse grained.
you have to add debug messages to various stages and see where is it hanging.
may be build a static bash and use that as init and debug the init sequence from there.
> 
> At the moment, I've had to delete my entire build, switch to the bernard-5.0.2 tag, and then attempt to try and build a new rootfilesystem. Others have successfully built and got linux running on my target board, with bernard-5.0, about a year ago.
> 


> So, if it does indeed turn out that I need to use an older version of gcc, for my target, what should I do, to continue working with the poky master repo, but only use the older gcc-4.5.1 release?


If you are willing to support 4.5.1 in your layer that will work for you. e.g. toolchain-layer has  4.6 retired into it. So try that one too.

> 
> Some options that I can think of are:
> 
> a. Reintroduce the older gcc-4.5.1 recipes in a local branch, but that would mean others would not be able to reproduce my work on their machines.
> 

a lot has changed in toolchain are so keep that in mind. You can start with original recipes in bernhard and back port bits from master.


> b. Use bernard-5.0.2 to build the toolchain, and set things up so that it uses that as an external toolchain.


this might work well.

> 
> I don't think both the options are elegant, so if someone could offer any suggestions it would be great. 
> 
> Best regards,
> 
> Elvis Dowson
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