| Message ID | 20211122192019.1277299-4-jean-philippe@linaro.org (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | tools/bpf: Enable cross-building with clang | expand |
On Mon, Nov 22, 2021 at 11:24 AM Jean-Philippe Brucker <jean-philippe@linaro.org> wrote: > > 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: 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..fe9201862aed 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) $(CLANG_CROSS_FLAGS) $(LDFLAGS) \ I haven't checked, but what would happen if we just use $(CFLAGS) here? Would it still work? > --shared -Wl,-soname,libbpf.so.$(LIBBPF_MAJOR_VERSION) \ > -Wl,--version-script=$(VERSION_SCRIPT) $< -lelf -lz -o $@ > @ln -sf $(@F) $(OUTPUT)libbpf.so > -- > 2.33.1 >
diff --git a/tools/lib/bpf/Makefile b/tools/lib/bpf/Makefile index 5f7086fae31c..fe9201862aed 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) $(CLANG_CROSS_FLAGS) $(LDFLAGS) \ --shared -Wl,-soname,libbpf.so.$(LIBBPF_MAJOR_VERSION) \ -Wl,--version-script=$(VERSION_SCRIPT) $< -lelf -lz -o $@ @ln -sf $(@F) $(OUTPUT)libbpf.so
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: Jean-Philippe Brucker <jean-philippe@linaro.org> --- tools/lib/bpf/Makefile | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)