Commit 4980beb4 authored by Jean-Philippe Brucker's avatar Jean-Philippe Brucker Committed by Andrii Nakryiko
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tools/libbpf: Enable cross-building with clang 



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.

Signed-off-by: default avatarJean-Philippe Brucker <jean-philippe@linaro.org>
Signed-off-by: default avatarAndrii Nakryiko <andrii@kernel.org>
Acked-by: default avatarQuentin Monnet <quentin@isovalent.com>
Link: https://lore.kernel.org/bpf/20211216163842.829836-4-jean-philippe@linaro.org
parent bf1be903

tools/lib/bpf/Makefile

+2 −1
Original line number Diff line number Diff line
@@ -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