tools: bpftool: do not link twice against libbpf.a in Makefile
authorQuentin Monnet <quentin.monnet@netronome.com>
Fri, 30 Aug 2019 11:00:40 +0000 (12:00 +0100)
committerDaniel Borkmann <daniel@iogearbox.net>
Fri, 30 Aug 2019 22:38:16 +0000 (00:38 +0200)
In bpftool's Makefile, $(LIBS) includes $(LIBBPF), therefore the library
is used twice in the linking command. No need to have $(LIBBPF) (from
$^) on that command, let's do with "$(OBJS) $(LIBS)" (but move $(LIBBPF)
_before_ the -l flags in $(LIBS)).

Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Signed-off-by: Quentin Monnet <quentin.monnet@netronome.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
tools/bpf/bpftool/Makefile

index b0c5a369f54aa9c969d59396f46276637a2322b0..39bc6f0f4f0bb839ade8b6962bff515729f318ea 100644 (file)
@@ -55,7 +55,7 @@ ifneq ($(EXTRA_LDFLAGS),)
 LDFLAGS += $(EXTRA_LDFLAGS)
 endif
 
-LIBS = -lelf -lz $(LIBBPF)
+LIBS = $(LIBBPF) -lelf -lz
 
 INSTALL ?= install
 RM ?= rm -f
@@ -117,7 +117,7 @@ $(OUTPUT)disasm.o: $(srctree)/kernel/bpf/disasm.c
 $(OUTPUT)feature.o: | zdep
 
 $(OUTPUT)bpftool: $(OBJS) $(LIBBPF)
-       $(QUIET_LINK)$(CC) $(CFLAGS) $(LDFLAGS) -o $@ $^ $(LIBS)
+       $(QUIET_LINK)$(CC) $(CFLAGS) $(LDFLAGS) -o $@ $(OBJS) $(LIBS)
 
 $(OUTPUT)%.o: %.c
        $(QUIET_CC)$(COMPILE.c) -MMD -o $@ $<