[OE-core] [PATCH v2] Introduce multiarch DISTRO_FEATURE

[Julian Pidancet]

On Wed, Nov 23, 2011 at 4:47 PM, Richard Purdie
<richard.purdie at linuxfoundation.org> wrote:
> On Wed, 2011-11-23 at 16:39 +0000, Julian Pidancet wrote:
>> On Wed, Nov 16, 2011 at 1:01 AM, Julian Pidancet
>> <julian.pidancet at gmail.com> wrote:
>> > This patch introduces a distro feature which enables gcc to produce
>> > both 32bit and 64bit code, and enables binutils to operate on both
>> > 32bit and 64bit binaries. It differs from multilib toolchains in
>> > that it does not require to compile a version of the libc for each
>> > architecture variant. However, the code produced for the secondary
>> > architecture will not be linkable against the libc.
>> >
>> > v2: - Renamed the feature name from "biarch" to "multiarch". The GCC
>> > installation manual claims that the mips-linux can be made a tri-arch
>> > compiler (http://gcc.gnu.org/install/configure.html)
>> >    - For x86_64, the compiler is made bi-arch by default, so nothing
>> > has to be done in particular.
>> >    - I analyzed the gcc/config.gcc from GCC sources and added in this
>> > patch all the architectures that could be made biarch with the version
>> > of gcc currently used in OE, which are powerpc, and sparc, in addition
>> > to x86. mips and s390 will probably be supported in future versions of
>> > gcc. For x86 and sparc, only the --enable-targets=all option is valid
>> > to make this work (this option doesn't have any other side effects than
>> > making the compiler bi-arch). For powerpc, I used the
>> > --enable-targets=powerpc64 option (although 'all' also works).
>> >
>> > Note: - Untested on powerpc and sparc. But I believe it works the same
>> > as with x86.
>> >      - gcc in meta-toolchain is also made multiarch.
>> >
>>
>> Anybody got the time to review this ?
>
> Funnily enough I was just talking with Saul about this. We're going to
> try and expose this to some extended testing (which we try and do for
> all compiler changes).
>

That's good news. In the mean-time, if there is any additional testing
you'd like me to perform, feel free to ask.

-- 
Julian