On 02/23/2018 02:32 AM, Arnd Bergmann wrote:
On Fri, Feb 23, 2018 at 12:48 AM, Guenter Roeck <li...@roeck-us.net> wrote:
On Thu, Feb 22, 2018 at 04:45:06PM +0100, Arnd Bergmann wrote:
While building the cross-toolchains, I noticed that overall, we can build almost
all linux target architectures with upstream binutils and gcc these days,
however there are still some exceptions, and I'd like to find out if anyone
has objections to removing the ones that do not have upstream support.
This are the four architectures I found:

* score (s+core, sunplus core) was a proprietary RISC architecture
   made by sunplus. It is unclear if they still ship any products based on
   this architecture, all they list is either ARM Cortex-A9 or an unspecified
   RISC core that could be any of arm, mips, nds32, arc, xtensa or
   something completely different. The two maintainers have both left the
   company many years ago and have not contributed any patches in
   at least five years. There was an upstream gcc port, which was marked
   'obsolete' in 2013 and got removed in gcc-5.0.
   I conclude that this is dead in Linux and can be removed

* unicore32 was a research project at Peking University with a SoC
   based on the Intel PXA design. No gcc source code has ever been
   published, the only toolchain available is a set of binaries that include
   a gcc-4.4 compiler. The project page at
   http://mprc.pku.edu.cn/~guanxuetao/linux/ has a TODO list that has
   not been modified since 2011. The maintainer still Acks patches
   and has last sent a pull request in 2014 and last sent a patch of
   his own in 2012 when the project appears to have stalled.
   I would suggest removing this one.

The above two would be primary removal targets for me; they are all
but impossible to support given the toolchain limitations. Meta
would have been another one, but James is already taking care of it.

Ok. Have you had any success building arch/hexagon with clang?

I have not tried. It is a pain having to use different toolchains for different
kernel versions, and I only do it if I absolutely have to. I use 
(Sourcery CodeBench Lite 2012.03-66) 4.6.1".


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