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Subject[PATCH RFC] tools: Factor Clang, LLC and LLVM utils definitions
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When dealing with BPF/BTF/pahole and DWARF v5 I wanted to build bpftool.

While looking into the source code I found duplicate assignments
in misc tools for the LLVM eco system, e.g. clang and llvm-objcopy.

Move the Clang, LLC and/or LLVM utils definitions to
tools/scripts/Makefile.include file and add missing
includes where needed.
Honestly, I was inspired by commit c8a950d0d3b9
("tools: Factor HOSTCC, HOSTLD, HOSTAR definitions").

I tested with bpftool and perf on Debian/testing AMD64 and
LLVM/Clang v11.1.0-rc1.

Build instructions:

[ make and make-options ]
MAKE="make V=1"
MAKE_OPTS="HOSTCC=clang HOSTCXX=clang++ HOSTLD=ld.lld CC=clang LD=ld.lld LLVM=1 LLVM_IAS=1"
MAKE_OPTS="$MAKE_OPTS PAHOLE=/opt/pahole/bin/pahole"

[ clean-up ]
$MAKE $MAKE_OPTS -C tools/ clean

[ bpftool ]
$MAKE $MAKE_OPTS -C tools/bpf/bpftool/

[ perf ]
PYTHON=python3 $MAKE $MAKE_OPTS -C tools/perf/

I was careful with respecting the user's wish to override custom compiler,
linker, GNU/binutils and/or LLVM utils settings.

Some personal notes:
1. I have NOT tested with cross-toolchain for other archs (cross compiler/linker etc.).
2. This patch is on top of Linux v5.11-rc3.

I hope to get some feedback from especially Linux-bpf folks.

Signed-off-by: Sedat Dilek <sedat.dilek@gmail.com>
---
tools/bpf/bpftool/Makefile | 2 --
tools/bpf/runqslower/Makefile | 3 ---
tools/build/feature/Makefile | 4 ++--
tools/perf/Makefile.perf | 1 -
tools/scripts/Makefile.include | 7 +++++++
tools/testing/selftests/bpf/Makefile | 3 +--
tools/testing/selftests/tc-testing/Makefile | 3 +--
7 files changed, 11 insertions(+), 12 deletions(-)

diff --git a/tools/bpf/bpftool/Makefile b/tools/bpf/bpftool/Makefile
index f897cb5fb12d..71c14efa6e91 100644
--- a/tools/bpf/bpftool/Makefile
+++ b/tools/bpf/bpftool/Makefile
@@ -75,8 +75,6 @@ endif

INSTALL ?= install
RM ?= rm -f
-CLANG ?= clang
-LLVM_STRIP ?= llvm-strip

FEATURE_USER = .bpftool
FEATURE_TESTS = libbfd disassembler-four-args reallocarray zlib libcap \
diff --git a/tools/bpf/runqslower/Makefile b/tools/bpf/runqslower/Makefile
index 4d5ca54fcd4c..9d9fb6209be1 100644
--- a/tools/bpf/runqslower/Makefile
+++ b/tools/bpf/runqslower/Makefile
@@ -3,9 +3,6 @@ include ../../scripts/Makefile.include

OUTPUT ?= $(abspath .output)/

-CLANG ?= clang
-LLC ?= llc
-LLVM_STRIP ?= llvm-strip
BPFTOOL_OUTPUT := $(OUTPUT)bpftool/
DEFAULT_BPFTOOL := $(BPFTOOL_OUTPUT)bpftool
BPFTOOL ?= $(DEFAULT_BPFTOOL)
diff --git a/tools/build/feature/Makefile b/tools/build/feature/Makefile
index 89ba522e377d..3e55edb3ea54 100644
--- a/tools/build/feature/Makefile
+++ b/tools/build/feature/Makefile
@@ -1,4 +1,6 @@
# SPDX-License-Identifier: GPL-2.0
+include ../../scripts/Makefile.include
+
FILES= \
test-all.bin \
test-backtrace.bin \
@@ -76,8 +78,6 @@ FILES= \
FILES := $(addprefix $(OUTPUT),$(FILES))

PKG_CONFIG ?= $(CROSS_COMPILE)pkg-config
-LLVM_CONFIG ?= llvm-config
-CLANG ?= clang

all: $(FILES)

diff --git a/tools/perf/Makefile.perf b/tools/perf/Makefile.perf
index 62f3deb1d3a8..f4df7534026d 100644
--- a/tools/perf/Makefile.perf
+++ b/tools/perf/Makefile.perf
@@ -176,7 +176,6 @@ endef
LD += $(EXTRA_LDFLAGS)

PKG_CONFIG = $(CROSS_COMPILE)pkg-config
-LLVM_CONFIG ?= llvm-config

RM = rm -f
LN = ln -f
diff --git a/tools/scripts/Makefile.include b/tools/scripts/Makefile.include
index 1358e89cdf7d..4255e71f72b7 100644
--- a/tools/scripts/Makefile.include
+++ b/tools/scripts/Makefile.include
@@ -69,6 +69,13 @@ HOSTCC ?= gcc
HOSTLD ?= ld
endif

+# Some tools require Clang, LLC and/or LLVM utils
+CLANG ?= clang
+LLC ?= llc
+LLVM_CONFIG ?= llvm-config
+LLVM_OBJCOPY ?= llvm-objcopy
+LLVM_STRIP ?= llvm-strip
+
ifeq ($(CC_NO_CLANG), 1)
EXTRA_WARNINGS += -Wstrict-aliasing=3
endif
diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile
index c51df6b91bef..952e2bc5f3bc 100644
--- a/tools/testing/selftests/bpf/Makefile
+++ b/tools/testing/selftests/bpf/Makefile
@@ -1,6 +1,7 @@
# SPDX-License-Identifier: GPL-2.0
include ../../../../scripts/Kbuild.include
include ../../../scripts/Makefile.arch
+include ../../../scripts/Makefile.include

CXX ?= $(CROSS_COMPILE)g++

@@ -18,8 +19,6 @@ ifneq ($(wildcard $(GENHDR)),)
GENFLAGS := -DHAVE_GENHDR
endif

-CLANG ?= clang
-LLVM_OBJCOPY ?= llvm-objcopy
BPF_GCC ?= $(shell command -v bpf-gcc;)
SAN_CFLAGS ?=
CFLAGS += -g -rdynamic -Wall -O2 $(GENFLAGS) $(SAN_CFLAGS) \
diff --git a/tools/testing/selftests/tc-testing/Makefile b/tools/testing/selftests/tc-testing/Makefile
index 91fee5c43274..4d639279f41e 100644
--- a/tools/testing/selftests/tc-testing/Makefile
+++ b/tools/testing/selftests/tc-testing/Makefile
@@ -1,4 +1,5 @@
# SPDX-License-Identifier: GPL-2.0
+include ../../../scripts/Makefile.include

top_srcdir = $(abspath ../../../..)
APIDIR := $(top_scrdir)/include/uapi
@@ -7,8 +8,6 @@ TEST_GEN_FILES = action.o
KSFT_KHDR_INSTALL := 1
include ../lib.mk

-CLANG ?= clang
-LLC ?= llc
PROBE := $(shell $(LLC) -march=bpf -mcpu=probe -filetype=null /dev/null 2>&1)

ifeq ($(PROBE),)
--
2.30.0
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