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

[Julian Pidancet]

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 ?