[oe] Prebuilt toolchains

[Gary Thomas]

On 11/11/2009 01:39 PM, Chris Conroy wrote:
> On Wed, 2009-11-11 at 10:00 -0700, Gary Thomas wrote:
>> I'd like to use my own toolchains when building OpenEmbedded.
>> I've tried to follow the information at:
>>     http://docs.openembedded.org/usermanual/usermanual.html#commonuse_prebuilt_toolchain
>> It's a bit terse and confusing, so I'm just trying to see
>> what I need (I think the section tries to discuss too many
>> concepts at once)
>>
>> Anyway, I added these lines to my local.conf:
>>     TARGET_SYS = "${TARGET_ARCH}-${TARGET_OS}"
>>     ASSUME_PROVIDED += " virtual/${TARGET_PREFIX}gcc "
>>     ASSUME_PROVIDED += " virtual/libc "
>>
>> This led to a number of other inferences which I don't understand.
>>     NOTE: selecting glibc to satisfy virtual/libintl due to PREFERRED_PROVIDERS
>>     NOTE: selecting glibc to satisfy runtime libsegfault due to PREFERRED_PROVIDER_virtual/libc = glibc
>>     NOTE: selecting linux-libc-headers to satisfy runtime linux-libc-headers-dev due to PREFERRED_PROVIDER_linux-libc-headers = linux-libc-headers
>>     NOTE: selecting glibc to satisfy runtime glibc due to PREFERRED_PROVIDER_virtual/libc = glibc
>>     NOTE: selecting gcc-cross-intermediate to satisfy virtual/powerpc-linux-gcc-intermediate due to PREFERRED_PROVIDERS
>>     NOTE: selecting linux-libc-headers to satisfy linux-libc-headers due to PREFERRED_PROVIDERS
>>     NOTE: selecting glibc to satisfy virtual/libiconv due to PREFERRED_PROVIDERS
>>     NOTE: selecting gcc-cross to satisfy runtime libgcc due to PREFERRED_PROVIDER_virtual/powerpc-linux-gcc = gcc-cross
>>     NOTE: selecting binutils-cross to satisfy virtual/powerpc-linux-binutils due to PREFERRED_PROVIDERS
>>     NOTE: selecting glibc-initial to satisfy virtual/powerpc-linux-libc-initial due to PREFERRED_PROVIDERS
>>     NOTE: selecting glibc to satisfy virtual/powerpc-linux-libc-for-gcc due to PREFERRED_PROVIDERS
>>     NOTE: selecting gcc-cross-initial to satisfy virtual/powerpc-linux-gcc-initial due to PREFERRED_PROVIDERS
>>
>> At which point, OE goes off on its merry way to build the
>> internal toolchains.
>>
>> What am I missing?
>
> You may want to try using the external-toolchain recipe. Though it's
> mainly used for toolchains built by OE, poky has recipes for
> Codesourcery toolchains which you could certainly use as a starting
> point for your toolchain.
>
> Then in your conf file you need to set the external-toolchain as the
> PREFERRED_PROVIDER for everything it provides (gcc, libc, libstdc++,
> binutils, etc..). I think this is a bit cleaner than doing
> ASSUME_PROVIDED because it makes the use of the external toolchain a bit
> more explicit.

Thanks for the pointer.  Given that I'm really new with OE, can you
give me a clue as to how to use that recipe?  Can I just add some
magic to my local.conf to make this work (instead of the lines quoted above)?

>
> I guess this leads me to ask the rest of the list: should the user
> manual be updated to include docs on the external-toolchain recipe?
>

-- 
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Gary Thomas                 |  Consulting for the
MLB Associates              |    Embedded world
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