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[2001:1ae9:1c2:4c00:726e:c10f:8833:ff22]) by smtp.gmail.com with ESMTPSA id qh13-20020a170906ecad00b009b29553b648sm888874ejb.206.2023.11.02.02.29.59 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 02 Nov 2023 02:30:00 -0700 (PDT) From: Jiri Olsa X-Google-Original-From: Jiri Olsa Date: Thu, 2 Nov 2023 10:29:58 +0100 To: =?iso-8859-1?Q?Bj=F6rn_T=F6pel?= Cc: Arnaldo Carvalho de Melo , Jean-Philippe Brucker , linux-kernel@vger.kernel.org, =?iso-8859-1?Q?Bj=F6rn_T=F6pel?= , Nathan Chancellor , Nick Desaulniers , Tom Rix , bpf@vger.kernel.org, Anders Roxell , llvm@lists.linux.dev Subject: Re: [PATCH] tools/build: Add clang cross-compilation flags to feature detection Message-ID: References: <20231102081441.240280-1-bjorn@kernel.org> Precedence: bulk X-Mailing-List: llvm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20231102081441.240280-1-bjorn@kernel.org> On Thu, Nov 02, 2023 at 09:14:41AM +0100, Björn Töpel wrote: > From: Björn Töpel > > When a tool cross-build has LLVM=1 set, the clang cross-compilation > flags are not passed to the feature detection build system. This > results in the host's features are detected instead of the targets. > > E.g, triggering a cross-build of bpftool: > > cd tools/bpf/bpftool > make ARCH=riscv CROSS_COMPILE=riscv64-linux-gnu- LLVM=1 > > would report the host's, and not the target's features. > > Correct the issue by passing the CLANG_CROSS_FLAGS variable to the > feature detection makefile. > > Fixes: cebdb7374577 ("tools: Help cross-building with clang") > Signed-off-by: Björn Töpel > --- > tools/build/Makefile.feature | 2 +- > tools/build/feature/Makefile | 8 ++++---- > 2 files changed, 5 insertions(+), 5 deletions(-) > > diff --git a/tools/build/Makefile.feature b/tools/build/Makefile.feature > index 934e2777a2db..25b009a6c05f 100644 > --- a/tools/build/Makefile.feature > +++ b/tools/build/Makefile.feature > @@ -8,7 +8,7 @@ endif > > feature_check = $(eval $(feature_check_code)) > define feature_check_code > - feature-$(1) := $(shell $(MAKE) OUTPUT=$(OUTPUT_FEATURES) CC="$(CC)" CXX="$(CXX)" CFLAGS="$(EXTRA_CFLAGS) $(FEATURE_CHECK_CFLAGS-$(1))" CXXFLAGS="$(EXTRA_CXXFLAGS) $(FEATURE_CHECK_CXXFLAGS-$(1))" LDFLAGS="$(LDFLAGS) $(FEATURE_CHECK_LDFLAGS-$(1))" -C $(feature_dir) $(OUTPUT_FEATURES)test-$1.bin >/dev/null 2>/dev/null && echo 1 || echo 0) > + feature-$(1) := $(shell $(MAKE) OUTPUT=$(OUTPUT_FEATURES) CC="$(CC)" CXX="$(CXX)" CFLAGS="$(EXTRA_CFLAGS) $(FEATURE_CHECK_CFLAGS-$(1))" CXXFLAGS="$(EXTRA_CXXFLAGS) $(FEATURE_CHECK_CXXFLAGS-$(1))" LDFLAGS="$(LDFLAGS) $(FEATURE_CHECK_LDFLAGS-$(1))" CLANG_CROSS_FLAGS="$(CLANG_CROSS_FLAGS)" -C $(feature_dir) $(OUTPUT_FEATURES)test-$1.bin >/dev/null 2>/dev/null && echo 1 || echo 0) > endef > > feature_set = $(eval $(feature_set_code)) > diff --git a/tools/build/feature/Makefile b/tools/build/feature/Makefile > index dad79ede4e0a..0231a53024c7 100644 > --- a/tools/build/feature/Makefile > +++ b/tools/build/feature/Makefile > @@ -84,12 +84,12 @@ PKG_CONFIG ?= $(CROSS_COMPILE)pkg-config > > all: $(FILES) > > -__BUILD = $(CC) $(CFLAGS) -MD -Wall -Werror -o $@ $(patsubst %.bin,%.c,$(@F)) $(LDFLAGS) > +__BUILD = $(CC) $(CFLAGS) $(CLANG_CROSS_FLAGS) -MD -Wall -Werror -o $@ $(patsubst %.bin,%.c,$(@F)) $(LDFLAGS) > BUILD = $(__BUILD) > $(@:.bin=.make.output) 2>&1 > BUILD_BFD = $(BUILD) -DPACKAGE='"perf"' -lbfd -ldl > BUILD_ALL = $(BUILD) -fstack-protector-all -O2 -D_FORTIFY_SOURCE=2 -ldw -lelf -lnuma -lelf -lslang $(FLAGS_PERL_EMBED) $(FLAGS_PYTHON_EMBED) -DPACKAGE='"perf"' -lbfd -ldl -lz -llzma -lzstd -lcap > > -__BUILDXX = $(CXX) $(CXXFLAGS) -MD -Wall -Werror -o $@ $(patsubst %.bin,%.cpp,$(@F)) $(LDFLAGS) > +__BUILDXX = $(CXX) $(CXXFLAGS) $(CLANG_CROSS_FLAGS) -MD -Wall -Werror -o $@ $(patsubst %.bin,%.cpp,$(@F)) $(LDFLAGS) > BUILDXX = $(__BUILDXX) > $(@:.bin=.make.output) 2>&1 > > ############################### > @@ -259,10 +259,10 @@ $(OUTPUT)test-reallocarray.bin: > $(BUILD) > > $(OUTPUT)test-libbfd-liberty.bin: > - $(CC) $(CFLAGS) -Wall -Werror -o $@ test-libbfd.c -DPACKAGE='"perf"' $(LDFLAGS) -lbfd -ldl -liberty > + $(CC) $(CFLAGS) $(CLANG_CROSS_FLAGS) -Wall -Werror -o $@ test-libbfd.c -DPACKAGE='"perf"' $(LDFLAGS) -lbfd -ldl -liberty > > $(OUTPUT)test-libbfd-liberty-z.bin: > - $(CC) $(CFLAGS) -Wall -Werror -o $@ test-libbfd.c -DPACKAGE='"perf"' $(LDFLAGS) -lbfd -ldl -liberty -lz > + $(CC) $(CFLAGS) $(CLANG_CROSS_FLAGS) -Wall -Werror -o $@ test-libbfd.c -DPACKAGE='"perf"' $(LDFLAGS) -lbfd -ldl -liberty -lz should we add this also to test-compile-32.bin/test-compile-x32.bin targets? jirka > > $(OUTPUT)test-cplus-demangle.bin: > $(BUILD) -liberty > > base-commit: 21e80f3841c01aeaf32d7aee7bbc87b3db1aa0c6 > -- > 2.40.1 > >