[PATCH RFC bpf-next 03/10] libbpf: Makefile: add C/CXX/LDFLAGS to libbpf.so and test_libpf targets
From: Ivan Khoronzhuk <hidden>
Date: 2019-08-30 00:51:43
Also in:
bpf, linux-arm-kernel, lkml
Subsystem:
bpf [general] (safe dynamic programs and tools), bpf [library] (libbpf), the rest · Maintainers:
Alexei Starovoitov, Daniel Borkmann, Andrii Nakryiko, Eduard Zingerman, Kumar Kartikeya Dwivedi, Linus Torvalds
In case of LDFLAGS and EXTRA_CC flags there is no way to pass them correctly to build command, for instance when --sysroot is used or external libraries are used, like -lelf. In follow patches this is used for samples/bpf cross-compiling. Signed-off-by: Ivan Khoronzhuk <redacted> --- tools/lib/bpf/Makefile | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-)
diff --git a/tools/lib/bpf/Makefile b/tools/lib/bpf/Makefile
index 844f6cd79c03..d606d249e334 100644
--- a/tools/lib/bpf/Makefile
+++ b/tools/lib/bpf/Makefile@@ -99,6 +99,10 @@ else CFLAGS := -g -Wall endif +ifdef EXTRA_CXXFLAGS + CXXFLAGS := $(EXTRA_CXXFLAGS) +endif + ifeq ($(feature-libelf-mmap), 1) override CFLAGS += -DHAVE_LIBELF_MMAP_SUPPORT endif
@@ -179,8 +183,9 @@ $(BPF_IN): force elfdep bpfdep $(OUTPUT)libbpf.so: $(OUTPUT)libbpf.so.$(LIBBPF_VERSION) $(OUTPUT)libbpf.so.$(LIBBPF_VERSION): $(BPF_IN) - $(QUIET_LINK)$(CC) --shared -Wl,-soname,libbpf.so.$(VERSION) \ - -Wl,--version-script=$(VERSION_SCRIPT) $^ -lelf -o $@ + $(QUIET_LINK)$(CC) $(LDFLAGS) \ + --shared -Wl,-soname,libbpf.so.$(VERSION) \ + -Wl,--version-script=$(VERSION_SCRIPT) $^ -lelf -o $@ @ln -sf $(@F) $(OUTPUT)libbpf.so @ln -sf $(@F) $(OUTPUT)libbpf.so.$(VERSION)
@@ -188,7 +193,7 @@ $(OUTPUT)libbpf.a: $(BPF_IN) $(QUIET_LINK)$(RM) $@; $(AR) rcs $@ $^ $(OUTPUT)test_libbpf: test_libbpf.cpp $(OUTPUT)libbpf.a - $(QUIET_LINK)$(CXX) $(INCLUDES) $^ -lelf -o $@ + $(QUIET_LINK)$(CXX) $(CXXFLAGS) $(LDFLAGS) $(INCLUDES) $^ -lelf -o $@ $(OUTPUT)libbpf.pc: $(QUIET_GEN)sed -e "s|@PREFIX@|$(prefix)|" \
--
2.17.1