selftests/bpf: Use pkg-config for libelf
When linking statically, libraries may require other dependencies to be included to ld flags. In particular, libelf may require libzstd. Use pkg-config to determine such dependencies. Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com> Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Link: https://lore.kernel.org/bpf/20231125084253.85025-4-akihiko.odaki@daynix.com
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@ -29,13 +29,17 @@ SAN_CFLAGS ?=
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SAN_LDFLAGS ?= $(SAN_CFLAGS)
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RELEASE ?=
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OPT_FLAGS ?= $(if $(RELEASE),-O2,-O0)
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LIBELF_CFLAGS := $(shell $(PKG_CONFIG) libelf --cflags 2>/dev/null)
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LIBELF_LIBS := $(shell $(PKG_CONFIG) libelf --libs 2>/dev/null || echo -lelf)
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CFLAGS += -g $(OPT_FLAGS) -rdynamic \
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-Wall -Werror \
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$(GENFLAGS) $(SAN_CFLAGS) \
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$(GENFLAGS) $(SAN_CFLAGS) $(LIBELF_CFLAGS) \
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-I$(CURDIR) -I$(INCLUDE_DIR) -I$(GENDIR) -I$(LIBDIR) \
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-I$(TOOLSINCDIR) -I$(APIDIR) -I$(OUTPUT)
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LDFLAGS += $(SAN_LDFLAGS)
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LDLIBS += -lelf -lz -lrt -lpthread
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LDLIBS += $(LIBELF_LIBS) -lz -lrt -lpthread
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ifneq ($(LLVM),)
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# Silence some warnings when compiled with clang
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