linux-kernel - Re: [PATCH v2] tools: do not include scripts/Kbuild.include

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Date:   Sat, 17 Apr 2021 23:57:23 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>
Cc:     Janosch Frank <frankja@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Andrii Nakryiko <andrii@...nel.org>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>, Martin KaFai Lau <kafai@...com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Paul Mackerras <paulus@...ba.org>,
        Shuah Khan <shuah@...nel.org>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        bpf <bpf@...r.kernel.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        kvm@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@...r.kernel.org>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        Networking <netdev@...r.kernel.org>
Subject: Re: [PATCH v2] tools: do not include scripts/Kbuild.include

On Fri, Apr 16, 2021 at 10:01 PM Masahiro Yamada <masahiroy@...nel.org> 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/
> Fixes: d9f4ff50d2aa ("kbuild: spilt cc-option and friends to scripts/Makefile.compiler")
> Reported-by: Janosch Frank <frankja@...ux.ibm.com>
> Reported-by: Christian Borntraeger <borntraeger@...ibm.com>
> Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>


Applied to linux-kbuild.




> ---
>
> Changes in v2:
>   - copy macros to tools/build/BUild.include
>
>  tools/build/Build.include                     | 24 +++++++++++++++++++
>  tools/testing/selftests/bpf/Makefile          |  2 +-
>  tools/testing/selftests/kvm/Makefile          |  2 +-
>  .../selftests/powerpc/pmu/ebb/Makefile        |  2 +-
>  tools/thermal/tmon/Makefile                   |  2 +-
>  5 files changed, 28 insertions(+), 4 deletions(-)
>
> diff --git a/tools/build/Build.include b/tools/build/Build.include
> index 585486e40995..2cf3b1bde86e 100644
> --- a/tools/build/Build.include
> +++ b/tools/build/Build.include
> @@ -100,3 +100,27 @@ cxx_flags = -Wp,-MD,$(depfile) -Wp,-MT,$@ $(CXXFLAGS) -D"BUILD_STR(s)=\#s" $(CXX
>  ## HOSTCC C flags
>
>  host_c_flags = -Wp,-MD,$(depfile) -Wp,-MT,$@ $(KBUILD_HOSTCFLAGS) -D"BUILD_STR(s)=\#s" $(HOSTCFLAGS_$(basetarget).o) $(HOSTCFLAGS_$(obj))
> +
> +# output directory for tests below
> +TMPOUT = .tmp_$$$$
> +
> +# try-run
> +# Usage: option = $(call try-run, $(CC)...-o "$$TMP",option-ok,otherwise)
> +# Exit code chooses option. "$$TMP" serves as a temporary file and is
> +# automatically cleaned up.
> +try-run = $(shell set -e;              \
> +       TMP=$(TMPOUT)/tmp;              \
> +       mkdir -p $(TMPOUT);             \
> +       trap "rm -rf $(TMPOUT)" EXIT;   \
> +       if ($(1)) >/dev/null 2>&1;      \
> +       then echo "$(2)";               \
> +       else echo "$(3)";               \
> +       fi)
> +
> +# cc-option
> +# Usage: cflags-y += $(call cc-option,-march=winchip-c6,-march=i586)
> +cc-option = $(call try-run, \
> +       $(CC) -Werror $(1) -c -x c /dev/null -o "$$TMP",$(1),$(2))
> +
> +# delete partially updated (i.e. corrupted) files on error
> +.DELETE_ON_ERROR:
> diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile
> index 044bfdcf5b74..17a5cdf48d37 100644
> --- a/tools/testing/selftests/bpf/Makefile
> +++ b/tools/testing/selftests/bpf/Makefile
> @@ -1,5 +1,5 @@
>  # SPDX-License-Identifier: GPL-2.0
> -include ../../../../scripts/Kbuild.include
> +include ../../../build/Build.include
>  include ../../../scripts/Makefile.arch
>  include ../../../scripts/Makefile.include
>
> diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile
> index a6d61f451f88..5ef141f265bd 100644
> --- a/tools/testing/selftests/kvm/Makefile
> +++ b/tools/testing/selftests/kvm/Makefile
> @@ -1,5 +1,5 @@
>  # SPDX-License-Identifier: GPL-2.0-only
> -include ../../../../scripts/Kbuild.include
> +include ../../../build/Build.include
>
>  all:
>
> diff --git a/tools/testing/selftests/powerpc/pmu/ebb/Makefile b/tools/testing/selftests/powerpc/pmu/ebb/Makefile
> index af3df79d8163..c5ecb4634094 100644
> --- a/tools/testing/selftests/powerpc/pmu/ebb/Makefile
> +++ b/tools/testing/selftests/powerpc/pmu/ebb/Makefile
> @@ -1,5 +1,5 @@
>  # SPDX-License-Identifier: GPL-2.0
> -include ../../../../../../scripts/Kbuild.include
> +include ../../../../../build/Build.include
>
>  noarg:
>         $(MAKE) -C ../../
> diff --git a/tools/thermal/tmon/Makefile b/tools/thermal/tmon/Makefile
> index 59e417ec3e13..9db867df7679 100644
> --- a/tools/thermal/tmon/Makefile
> +++ b/tools/thermal/tmon/Makefile
> @@ -1,6 +1,6 @@
>  # SPDX-License-Identifier: GPL-2.0
>  # We need this for the "cc-option" macro.
> -include ../../../scripts/Kbuild.include
> +include ../../build/Build.include
>
>  VERSION = 1.0
>
> --
> 2.27.0
>
> --
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-- 
Best Regards
Masahiro Yamada