selftests: hid: allow to compile hid_bpf with LLVM

clang doesn't like to compile a source to the final binary directly:

clang-14: error: cannot specify -o when generating multiple output files

So split the final rule in 2, and ensure we compile all dependencies
before.

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

diff --git a/tools/testing/selftests/hid/Makefile b/tools/testing/selftests/hid/Makefile
index f6fc5cfff77034315dba0161be648dfc258df364..83e8f87d643a72a9dfa032b2064916ed695301e6 100644 (file)
--- a/tools/testing/selftests/hid/Makefile
+++ b/tools/testing/selftests/hid/Makefile
@@ -91,10 +91,6 @@ $(MAKE_DIRS):
        $(call msg,MKDIR,,$@)
        $(Q)mkdir -p $@
 
-$(OUTPUT)/%.o: %.c
-       $(call msg,CC,,$@)
-       $(Q)$(CC) $(CFLAGS) -c $(filter %.c,$^) $(LDLIBS) -o $@
-
 # LLVM's ld.lld doesn't support all the architectures, so use it only on x86
 ifeq ($(SRCARCH),x86)
 LLD := lld
@@ -223,7 +219,11 @@ $(BPF_SKELS): %.skel.h: %.bpf.o $(BPFTOOL) | $(OUTPUT)
        $(Q)$(BPFTOOL) gen object $(<:.o=.linked1.o) $<
        $(Q)$(BPFTOOL) gen skeleton $(<:.o=.linked1.o) name $(notdir $(<:.bpf.o=)) > $@
 
-$(OUTPUT)/%:%.c $(BPF_SKELS) $(KHDR_INCLUDES)/linux/hid.h
+$(OUTPUT)/%.o: %.c $(BPF_SKELS) $(KHDR_INCLUDES)/linux/hid.h
+       $(call msg,CC,,$@)
+       $(Q)$(CC) $(CFLAGS) -c $(filter %.c,$^) $(LDLIBS) -o $@
+
+$(OUTPUT)/%: $(OUTPUT)/%.o
        $(call msg,BINARY,,$@)
        $(Q)$(LINK.c) $^ $(LDLIBS) -o $@