Merge branch 'bpf-tools-build-improvements'

Jakub Kicinski says:

====================
As promised this series addresses nits and minor issues in tools/bpf
build infra.  One GCC-7 warning which is nice to get rid of.  Dependencies
when built with OUTPUT are fixed.  make clean will now remove the
FEATURE-DUMP.* files.  PHONY target is also updated to match reality.
====================
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>

tools/bpf/Makefile

@@ -81,6 +81,8 @@ clean: bpftool_clean
 	$(call QUIET_CLEAN, bpf-progs)
 	$(Q)rm -rf $(OUTPUT)*.o $(OUTPUT)bpf_jit_disasm $(OUTPUT)bpf_dbg \
 	       $(OUTPUT)bpf_asm $(OUTPUT)bpf_exp.yacc.* $(OUTPUT)bpf_exp.lex.*
+	$(call QUIET_CLEAN, core-gen)
+	$(Q)rm -f $(OUTPUT)FEATURE-DUMP.bpf
 
 install: $(PROGS) bpftool_install
 	$(call QUIET_INSTALL, bpf_jit_disasm)
@@ -100,4 +102,4 @@ bpftool_install:
 bpftool_clean:
 	$(call descend,bpftool,clean)
 
-.PHONY: bpftool FORCE
+.PHONY: all install clean bpftool bpftool_install bpftool_clean

tools/bpf/bpftool/Makefile

@@ -70,7 +70,7 @@ ifeq ($(feature-disassembler-four-args), 1)
 CFLAGS += -DDISASM_FOUR_ARGS_SIGNATURE
 endif
 
-include $(wildcard *.d)
+include $(wildcard $(OUTPUT)*.d)
 
 all: $(OUTPUT)bpftool
 
@@ -89,6 +89,8 @@ $(OUTPUT)%.o: %.c
 clean: $(LIBBPF)-clean
 	$(call QUIET_CLEAN, bpftool)
 	$(Q)$(RM) $(OUTPUT)bpftool $(OUTPUT)*.o $(OUTPUT)*.d
+	$(call QUIET_CLEAN, core-gen)
+	$(Q)$(RM) $(OUTPUT)FEATURE-DUMP.bpftool
 
 install: $(OUTPUT)bpftool
 	$(call QUIET_INSTALL, bpftool)

tools/bpf/bpftool/xlated_dumper.h

@@ -49,7 +49,7 @@ struct dump_data {
 	unsigned long address_call_base;
 	struct kernel_sym *sym_mapping;
 	__u32 sym_count;
-	char scratch_buff[SYM_MAX_NAME];
+	char scratch_buff[SYM_MAX_NAME + 8];
 };
 
 void kernel_syms_load(struct dump_data *dd);