[OE-core] [for-krogoth] Backport for libc != glibc

[Khem Raj]

On Sat, Jun 18, 2016 at 6:27 AM, Otavio Salvador
<otavio.salvador at ossystems.com.br> wrote:
> Hello,
>
> At O.S. Systems we are involved in some projects which uses musl as
> libC. For those, we are doing the SDK for faster development and found
> that it is currently broken on Krogoth.
>
> Master branch has the need fixes. The fixes needed are
> OE-Core:2b9ae0ab and OE-Core:fcaaabb4
>
> commit 2b9ae0ab056e62290f2328aa0d4dd70e6f138759
> Author: Khem Raj <raj.khem at gmail.com>
> Date:   Wed May 11 10:35:40 2016 -0700
>
>     musl: Create symlinks for stub libraries
>
>     Some libraries e.g. libm.so are needed to be
>     created so that SDKs built with distros which
>     disable static librararies can have the stubs
>     and since default linker script requires -lm
>     this helps in compiling applications with SDK
>
>     there are .a equivalents for these libraries
>     but they do not land in SDKs when static libs
>     are disabled distrowide
>
>     Signed-off-by: Khem Raj <raj.khem at gmail.com>
>     Signed-off-by: Richard Purdie <richard.purdie at linuxfoundation.org>
>
> commit fcaaabb401fffcda4db9a7d1f927a2a404e4776d
> Author: Khem Raj <raj.khem at gmail.com>
> Date:   Wed May 11 10:35:45 2016 -0700
>
>    gcc-runtime, libgcc: Symlink c++ header and startup files in
> target_triplet for SDK use
>
>    We build SDKs such that gcc-cross-candian is built for only one
>    target *-*-linux and then use -muclibc or -mmusl to let it compile
>    code for other libc variants. This works fine when libc = glibc
>    however it does not work for c++ programs when libc != glibc since
>    there are c++ headers installed under ${includedir}/c++/${BINV}/${TARGET_SYS}
>    which is fine when gcc-runtime and gcc-cross-candian uses same
> --target options
>    gxx includedir searches in right triplet, but it fails with musl/uclibc
>    since gcc will look for glibc based triplet but gcc-runtime will install
>    them under musl/uclibc triplet.
>
>    This patch symlinks the musl/uclibc triplet to glibc triplet when
> libc != glibc
>
>    This fixes SDKs for musl/uclibc
>
>    Signed-off-by: Khem Raj <raj.khem at gmail.com>
>    Signed-off-by: Richard Purdie <richard.purdie at linuxfoundation.org>
>
> Backporting those, on top of current Krogoth branch, fixes the SDK
> issues we had at the moment.
>
> Could those be reviewed and queued for the next backport?

They look fine for backport to krogoth. Please submit pull requests

>
> --
> Otavio Salvador                             O.S. Systems
> http://www.ossystems.com.br        http://code.ossystems.com.br
> Mobile: +55 (53) 9981-7854            Mobile: +1 (347) 903-9750