From patchwork Thu Nov 2 10:32:52 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?b?QmrDtnJuIFTDtnBlbA==?= X-Patchwork-Id: 13443606 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E64B514A92; Thu, 2 Nov 2023 10:32:59 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="ZJiNlDs4" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 22382C433C7; Thu, 2 Nov 2023 10:32:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1698921179; bh=vCsEm5kYfVokXfpt6FzUVW6m+28U/AvZkO+g4Ew8jFk=; h=From:To:Cc:Subject:Date:From; b=ZJiNlDs4f9oSJYvvei6uvYrpqZq37TUCwF2TSXFU0cathgxMjUlb4jnlSBN4uWgXY h1C9FNJXF8eXE6TTbyrPdzGPap3ZvqTeBycVZLwtI/OBCUOA+yoZaqgqRt9+AtkZYO 1kJ2hdn88SArB44LpXio9JYg3HVTdQLy/72rTKqAFoB3/hWHcAVdzvxYSVIMHY/pmQ uCnjE2dRoZusENcLrLAjYtjG94rH95ydVkXdor2gNtHsd8Jh5z22QhPIQ3qx+ucgsn Hnsk6XReZPEAH78MSG8NTPZp2RwwvCPMNAXDwhxHJEM2hylphICX3Wg97UUqFLlfiL TC+p/kmOFN+ZA== From: =?utf-8?b?QmrDtnJuIFTDtnBlbA==?= To: Arnaldo Carvalho de Melo , Jean-Philippe Brucker , linux-kernel@vger.kernel.org Cc: =?utf-8?b?QmrDtnJuIFTDtnBlbA==?= , Nathan Chancellor , Nick Desaulniers , Tom Rix , bpf@vger.kernel.org, Anders Roxell , llvm@lists.linux.dev, Jiri Olsa Subject: [PATCH v2] tools/build: Add clang cross-compilation flags to feature detection Date: Thu, 2 Nov 2023 11:32:52 +0100 Message-Id: <20231102103252.247147-1-bjorn@kernel.org> X-Mailer: git-send-email 2.40.1 Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 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 Acked-by: Jiri Olsa Reviewed-by: Jean-Philippe Brucker --- tools/build/Makefile.feature | 2 +- tools/build/feature/Makefile | 12 ++++++------ 2 files changed, 7 insertions(+), 7 deletions(-) base-commit: 21e80f3841c01aeaf32d7aee7bbc87b3db1aa0c6 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..c4458345e564 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 $(OUTPUT)test-cplus-demangle.bin: $(BUILD) -liberty @@ -283,10 +283,10 @@ $(OUTPUT)test-libbabeltrace.bin: $(BUILD) # -lbabeltrace provided by $(FEATURE_CHECK_LDFLAGS-libbabeltrace) $(OUTPUT)test-compile-32.bin: - $(CC) -m32 -o $@ test-compile.c + $(CC) $(CLANG_CROSS_FLAGS) -m32 -o $@ test-compile.c $(OUTPUT)test-compile-x32.bin: - $(CC) -mx32 -o $@ test-compile.c + $(CC) $(CLANG_CROSS_FLAGS) -mx32 -o $@ test-compile.c $(OUTPUT)test-zlib.bin: $(BUILD) -lz