[Buildroot] [PATCH 0/2 v2] linux|uboot: fix build with host-gcc 10+ for older versions (branch yem/yylloc)

["Yann E. MORIN" <yann.morin.1998@free.fr>]

Hello All!

This two-patch series aims at side-stepping the multiple symbol
declaration in older Linux and U-Boot, where the infamous yylloc is
defined more than once.

Like we have a fix for the perl timeconst issue in linux, do s similar
tweak for yylloc in the two packages known to be affected, Linux and
U-Boot.

Here is a pipeline with all the defconfig builds:
    https://gitlab.com/ymorin/buildroot/-/pipelines/460207930

There are still some failures, but none relate to the yylloc issue:

  - too long build time or not space left on device (I am only using
    elastic runners)

  - defconfig not up-to-date (e.g. using kernel headers version since
    removed)

  - missing host dependencies for kernel (openssl, libelf) or uboot
    (python)

  - another host-gcc 10+ symbol redefinition issue (galileo [0])

  - make 4.3 issues. For example: amarula_a64_relic_defconfig
    https://gitlab.com/ymorin/buildroot/-/jobs/2035820886

      DTC     arch/arm/dts/sun50i-a64-amarula-relic.dtb
    Error: arch/arm/dts/.sun50i-a64-amarula-relic.dtb.pre.tmp:66.1-10 syntax error
    FATAL ERROR: Unable to parse input tree

    This is caused by make 4.3 that no longer treats '#' as special in
    macros, and shall no longer be escaped:
        https://lwn.net/Articles/810071/

    This causes '\#include "something"' to be injected as-is at the end
    of the temporary DTS, and of course, dtc does not cope nicely with
    that... [1]

    Unfortuantely, I don't think we can do a generic fixup for that
    one...

  - some other issues (e.g. deprecated 'partition-type' for geniamge..)

[0] this was fixed in 2014 in the kernel:
      - eeeda4cd06e828b331b15741a204ff9f5874d28d
[1] this was fixed in 2018 in uboot:
      - e5e701c2b8470de044c5c71d2a54ecfc72680d59
      - 0c544115379ed77c1843a194e26960e5b8f3d369

Changes v1 -> v2:
  - don't fail if no file to fix: use 'grep -Z |xargs -0 -r' (Arnout)
  - extend cover-ltter with a pipeline reference and analysese of
    remaining build failures

Regards,
Yann E. MORIN.


----------------------------------------------------------------
Yann E. MORIN (2):
      boot/uboot: fix build with host-gcc 10+
      linux: fix build with host-gcc 10+

 boot/uboot/uboot.mk | 7 +++++++
 linux/linux.mk      | 7 +++++++
 2 files changed, 14 insertions(+)

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