On 16.04.21 15:00, Masahiro Yamada wrote:

Since commit d9f4ff50d2aa ("kbuild: spilt cc-option and friends to
scripts/Makefile.compiler"), some kselftests fail to build.

The tools/ directory opted out Kbuild, and went in a different
direction. They copy any kind of files to the tools/ directory
in order to do whatever they want in their world.

tools/build/Build.include mimics scripts/Kbuild.include, but some
tool Makefiles included the Kbuild one to import a feature that is
missing in tools/build/Build.include:

  - Commit ec04aa3ae87b ("tools/thermal: tmon: use "-fstack-protector"
    only if supported") included scripts/Kbuild.include from
    tools/thermal/tmon/Makefile to import the cc-option macro.

  - Commit c2390f16fc5b ("selftests: kvm: fix for compilers that do
    not support -no-pie") included scripts/Kbuild.include from
    tools/testing/selftests/kvm/Makefile to import the try-run macro.

  - Commit 9cae4ace80ef ("selftests/bpf: do not ignore clang
    failures") included scripts/Kbuild.include from
    tools/testing/selftests/bpf/Makefile to import the .DELETE_ON_ERROR
    target.

  - Commit 0695f8bca93e ("selftests/powerpc: Handle Makefile for
    unrecognized option") included scripts/Kbuild.include from
    tools/testing/selftests/powerpc/pmu/ebb/Makefile to import the
    try-run macro.

Copy what they need into tools/build/Build.include, and make them
include it instead of scripts/Kbuild.include.

Link: https://lore.kernel.org/lkml/86dadf33-70f7-a5ac-cb8c-64966d2f45a1@linux.ibm.com/ (local)
Fixes: d9f4ff50d2aa ("kbuild: spilt cc-option and friends to scripts/Makefile.compiler")
Reported-by: Janosch Frank <frankja@linux.ibm.com>
Reported-by: Christian Borntraeger <redacted>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>

looks better.
Tested-by: Christian Borntraeger <redacted>