Error in dtc around -fno-common

[Nathan Chancellor]

Hi all,

GCC 10 is defaulting to -fno-common and Clang has decided to join it [1],
which will completely turn our CI [2] red across the board when our
compiler uprevs in the current tree's state:

ld.lld: error: duplicate symbol: yylloc
>>> defined at dtc-lexer.lex.c
>>> scripts/dtc/dtc-lexer.lex.o:(yylloc)
>>> defined at dtc-parser.tab.c
>>> scripts/dtc/dtc-parser.tab.o:(.bss+0x10)
clang-11: error: linker command failed with exit code 1 (use -v to see
invocation)

Is it possible to pick a single patch from dtc and get it fast tracked
to mainline/stable so that this does not happen? It would be this one:

https://git.kernel.org/pub/scm/utils/dtc/dtc.git/commit/?id=0e9225eb0dfec51def612b928d2f1836b092bc7e

I have tested it and it works fine. If that is not possible, how would
you recommend solving this issue?

[1]: https://github.com/llvm/llvm-project/commit/3d9a0445cce368b55dc3a573bc91fe902bbb977f
[2]: https://travis-ci.com/ClangBuiltLinux/continuous-integration/builds/152428887

Cheers,
Nathan

[Nick Desaulniers]

Bumping this thread. It would be good to send this as a fixup for the
next -rc if possible, that way we can start backporting it to -stable.

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Thanks,
~Nick Desaulniers

[Rob Herring]

On Wed, Mar 11, 2020 at 3:39 PM Nick Desaulniers
<ndesau...@google.com> wrote:
>
> Bumping this thread. It would be good to send this as a fixup for the
> next -rc if possible, that way we can start backporting it to -stable.

The single fix is in my tree now and I'll sync dtc for 5.7.

Rob