Re: [PATCH 2/2] tools: do not include scripts/Kbuild.include

Paolo Bonzini <pbonzini@xxxxxxxxxx> · Thu, 15 Apr 2021 09:40:20 +0200

On 15/04/21 09:27, 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 to do 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 want there, and stop including scripts/Kbuild.include
from the tool Makefiles.

I think it would make sense to add try-run, cc-option and 
.DELETE_ON_ERROR to tools/build/Build.include?

Paolo

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

  tools/testing/selftests/bpf/Makefile          |  3 ++-
  tools/testing/selftests/kvm/Makefile          | 12 +++++++++++-
  .../selftests/powerpc/pmu/ebb/Makefile        | 11 ++++++++++-
  tools/thermal/tmon/Makefile                   | 19 +++++++++++++++++--
  4 files changed, 40 insertions(+), 5 deletions(-)

diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile
index 044bfdcf5b74..d872b9f41543 100644
--- a/tools/testing/selftests/bpf/Makefile
+++ b/tools/testing/selftests/bpf/Makefile
@@ -1,5 +1,4 @@
  # SPDX-License-Identifier: GPL-2.0
-include ../../../../scripts/Kbuild.include
  include ../../../scripts/Makefile.arch
  include ../../../scripts/Makefile.include
  
@@ -476,3 +475,5 @@ EXTRA_CLEAN := $(TEST_CUSTOM_PROGS) $(SCRATCH_DIR) $(HOST_SCRATCH_DIR)	\
  	prog_tests/tests.h map_tests/tests.h verifier/tests.h		\
  	feature								\
  	$(addprefix $(OUTPUT)/,*.o *.skel.h no_alu32 bpf_gcc bpf_testmod.ko)
+
+.DELETE_ON_ERROR:
diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile
index a6d61f451f88..8b45bc417d83 100644
--- a/tools/testing/selftests/kvm/Makefile
+++ b/tools/testing/selftests/kvm/Makefile
@@ -1,5 +1,15 @@
  # SPDX-License-Identifier: GPL-2.0-only
-include ../../../../scripts/Kbuild.include
+
+TMPOUT = .tmp_$$$$
+
+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)
  
  all:
  
diff --git a/tools/testing/selftests/powerpc/pmu/ebb/Makefile b/tools/testing/selftests/powerpc/pmu/ebb/Makefile
index af3df79d8163..d5d3e869df93 100644
--- a/tools/testing/selftests/powerpc/pmu/ebb/Makefile
+++ b/tools/testing/selftests/powerpc/pmu/ebb/Makefile
@@ -1,5 +1,4 @@
  # SPDX-License-Identifier: GPL-2.0
-include ../../../../../../scripts/Kbuild.include
  
  noarg:
  	$(MAKE) -C ../../
@@ -8,6 +7,16 @@ noarg:
  CFLAGS += -m64
  
  TMPOUT = $(OUTPUT)/TMPDIR/
+
+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)
+
  # Toolchains may build PIE by default which breaks the assembly
  no-pie-option := $(call try-run, echo 'int main() { return 0; }' | \
          $(CC) -Werror $(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS) -no-pie -x c - -o "$$TMP", -no-pie)
diff --git a/tools/thermal/tmon/Makefile b/tools/thermal/tmon/Makefile
index 59e417ec3e13..92a683e4866c 100644
--- a/tools/thermal/tmon/Makefile
+++ b/tools/thermal/tmon/Makefile
@@ -1,6 +1,21 @@
  # SPDX-License-Identifier: GPL-2.0
-# We need this for the "cc-option" macro.
-include ../../../scripts/Kbuild.include
+
+TMPOUT = .tmp_$$$$
+
+try-run = $(shell set -e;		\
+	TMP=$(TMPOUT)/tmp;		\
+	mkdir -p $(TMPOUT);		\
+	trap "rm -rf $(TMPOUT)" EXIT;	\
+	if ($(1)) >/dev/null 2>&1;	\
+	then echo "$(2)";		\
+	else echo "$(3)";		\
+	fi)
+
+__cc-option = $(call try-run,\
+	$(1) -Werror $(2) $(3) -c -x c /dev/null -o "$$TMP",$(3),$(4))
+
+cc-option = $(call __cc-option, $(CC),\
+	$(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS),$(1),$(2))
  
  VERSION = 1.0
  








