[Bug 2138929] Re: flags for variant are set despite an incompatible host arch

[Matthias Klose]

wishlist? this completely breaks any cross building with amd64v3 as the
host. Please note that DEB_HOST_ARCH_VARIANT is set on the buildds, not
by myself. Setting DEB_HOST_ARCH for the dpkg-architecture call seems to
be valid behavior, so the variant should not break that.

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Title:
  flags for variant are set despite an incompatible host arch

Status in dpkg package in Ubuntu:
  Confirmed

Bug description:
  seen when trying to get target flags on an amd64v3 buildd, flags for
  variant are set despite an incompatible host arch

  $ DEB_HOST_ARCH_VARIANT=amd64v3 DEB_HOST_ARCH=arm64 dpkg-buildflags --get CFLAGS
  dpkg-buildflags: warning: debian/changelog not found. Not setting ELF package metadata parameter.
  -g -O2 -Werror=implicit-function-declaration -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer -ffile-prefix-map=/home/packages/tmp/m=. -flto=auto -ffat-lto-objects -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -mbranch-protection=standard -march=x86-64-v3

  these are the correct flags for arm64, but -march=x86-64-v3 is added
  for no reason, letting builds fail.

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