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From: Jean-Philippe Brucker <jean-philippe@linaro.org>
To: ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org,
	shuah@kernel.org, nathan@kernel.org, ndesaulniers@google.com
Cc: kafai@fb.com, songliubraving@fb.com, yhs@fb.com,
	john.fastabend@gmail.com, kpsingh@kernel.org,
	quentin@isovalent.com, bpf@vger.kernel.org,
	linux-kselftest@vger.kernel.org, llvm@lists.linux.dev,
	Jean-Philippe Brucker <jean-philippe@linaro.org>
Subject: [PATCH bpf-next v2 3/6] tools/libbpf: Enable cross-building with clang
Date: Thu, 16 Dec 2021 16:38:40 +0000	[thread overview]
Message-ID: <20211216163842.829836-4-jean-philippe@linaro.org> (raw)
In-Reply-To: <20211216163842.829836-1-jean-philippe@linaro.org>

Cross-building using clang requires passing the "-target" flag rather
than using the CROSS_COMPILE prefix. Makefile.include transforms
CROSS_COMPILE into CLANG_CROSS_FLAGS. Add them to the CFLAGS.

Acked-by: Quentin Monnet <quentin@isovalent.com>
Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
---
 tools/lib/bpf/Makefile | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tools/lib/bpf/Makefile b/tools/lib/bpf/Makefile
index 5f7086fae31c..f947b61b2107 100644
--- a/tools/lib/bpf/Makefile
+++ b/tools/lib/bpf/Makefile
@@ -90,6 +90,7 @@ override CFLAGS += -Werror -Wall
 override CFLAGS += $(INCLUDES)
 override CFLAGS += -fvisibility=hidden
 override CFLAGS += -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64
+override CFLAGS += $(CLANG_CROSS_FLAGS)
 
 # flags specific for shared library
 SHLIB_FLAGS := -DSHARED -fPIC
@@ -162,7 +163,7 @@ $(BPF_HELPER_DEFS): $(srctree)/tools/include/uapi/linux/bpf.h
 $(OUTPUT)libbpf.so: $(OUTPUT)libbpf.so.$(LIBBPF_VERSION)
 
 $(OUTPUT)libbpf.so.$(LIBBPF_VERSION): $(BPF_IN_SHARED) $(VERSION_SCRIPT)
-	$(QUIET_LINK)$(CC) $(LDFLAGS) \
+	$(QUIET_LINK)$(CC) $(CFLAGS) $(LDFLAGS) \
 		--shared -Wl,-soname,libbpf.so.$(LIBBPF_MAJOR_VERSION) \
 		-Wl,--version-script=$(VERSION_SCRIPT) $< -lelf -lz -o $@
 	@ln -sf $(@F) $(OUTPUT)libbpf.so
-- 
2.34.1


  parent reply	other threads:[~2021-12-16 16:50 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-12-16 16:38 [PATCH bpf-next v2 0/6] tools/bpf: Enable cross-building with clang Jean-Philippe Brucker
2021-12-16 16:38 ` [PATCH bpf-next v2 1/6] tools: Help " Jean-Philippe Brucker
2021-12-16 19:16   ` Nick Desaulniers
2022-01-29  1:10   ` Nathan Chancellor
2022-01-31 14:10     ` Jean-Philippe Brucker
2022-01-31 17:04       ` Nathan Chancellor
2021-12-16 16:38 ` [PATCH bpf-next v2 2/6] tools/resolve_btfids: Support cross-building the kernel " Jean-Philippe Brucker
2021-12-16 16:38 ` Jean-Philippe Brucker [this message]
2021-12-16 16:38 ` [PATCH bpf-next v2 4/6] bpftool: Enable cross-building " Jean-Philippe Brucker
2021-12-16 16:38 ` [PATCH bpf-next v2 5/6] tools/runqslower: " Jean-Philippe Brucker
2021-12-16 16:38 ` [PATCH bpf-next v2 6/6] selftests/bpf: " Jean-Philippe Brucker
2021-12-16 20:32 ` [PATCH bpf-next v2 0/6] tools/bpf: " patchwork-bot+netdevbpf

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