netdev - Re: [bpf PATCH v2] bpf: fix for lex/yacc build error with gcc-5

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Date:   Thu, 26 Apr 2018 10:43:17 +0200
From:   Jiri Benc <jbenc@...hat.com>
To:     John Fastabend <john.fastabend@...il.com>
Cc:     ast@...nel.org, daniel@...earbox.net, netdev@...r.kernel.org
Subject: Re: [bpf PATCH v2] bpf: fix for lex/yacc build error with gcc-5

On Wed, 25 Apr 2018 14:22:45 -0700, John Fastabend wrote:
> --- a/tools/bpf/Makefile
> +++ b/tools/bpf/Makefile
> @@ -76,6 +76,8 @@ $(OUTPUT)bpf_asm: $(OUTPUT)bpf_asm.o $(OUTPUT)bpf_exp.yacc.o $(OUTPUT)bpf_exp.le
>  	$(QUIET_LINK)$(CC) $(CFLAGS) -o $@ $^
>  
>  $(OUTPUT)bpf_exp.lex.c: $(OUTPUT)bpf_exp.yacc.c
> +$(OUTPUT)bpf_exp.yacc.o: $(OUTPUT)bpf_exp.yacc.c
> +$(OUTPUT)bpf_exp.lex.o: $(OUTPUT)bpf_exp.lex.c

Looks better than v1, the first dependency is important.

For some reason, I did not need the other two rules.

By the way, make invoked from tools/bpf/ has never really worked, even
before my patchset. This works correctly:

cd tools
make bpf

 Jiri