[Bug 1939379] Re: ARM kernel builds fail with GCC 11

[Matthias Klose]

yes, that's what   is supposed to do, but apparently it's not doing
that. Now configured with --with-fpu=vfpv3-d16 again, which lets the
boost build at least succeed again.

Still need to figure out if we need to re-upload packages built after
the gcc-defaults change and before the gcc fix.

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https://bugs.launchpad.net/bugs/1939379

Title:
  ARM kernel builds fail with GCC 11

Status in gcc-11 package in Ubuntu:
  Confirmed
Status in gcc-defaults package in Ubuntu:
  Invalid

Bug description:
  While this might be a kernel build problem (see LP: #1939308) I wanted
  to raise the issue against the toolchain just so we can make sure it's
  *not* a toolchain bug. Basically the following behavior changed from
  gcc 10:

  $ arm-linux-gnueabihf-gcc-10 -march=armv7-a -c -x c /dev/null ; echo $?
  0

  $ arm-linux-gnueabihf-gcc-11 -march=armv7-a -c -x c /dev/null ; echo $?
  cc1: error: ‘-mfloat-abi=hard’: selected architecture lacks an FPU
  1

  Presumably the GCC 11 hard-float compiler now enforces the default
  config --with-float=hard?

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