linux-kernel - Re: [PATCH v2 0/5] tools: fix compilation failure caused by init_disassemble

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Date:   Sun, 31 Jul 2022 18:40:41 -0700
From:   Andres Freund <andres@...razel.de>
To:     Jiri Olsa <olsajiri@...il.com>
Cc:     bpf@...r.kernel.org, linux-kernel@...r.kernel.org,
        Alexei Starovoitov <ast@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        Sedat Dilek <sedat.dilek@...il.com>,
        Quentin Monnet <quentin@...valent.com>
Subject: Re: [PATCH v2 0/5] tools: fix compilation failure caused by
 init_disassemble_info API changes

Hi,

On 2022-07-05 00:12:37 +0200, Jiri Olsa wrote:
> On Mon, Jul 04, 2022 at 01:19:22PM -0700, Andres Freund wrote:
> > > diff --git a/tools/perf/Makefile.config b/tools/perf/Makefile.config
> > > index ee417c321adb..2aa0bad11f05 100644
> > > --- a/tools/perf/Makefile.config
> > > +++ b/tools/perf/Makefile.config
> > > @@ -914,8 +914,6 @@ ifndef NO_LIBBFD
> > >          FEATURE_CHECK_LDFLAGS-disassembler-init-styled += -liberty -lz -ldl
> > >        endif
> > >      endif
> > > -    $(call feature_check,disassembler-four-args)
> > > -    $(call feature_check,disassembler-init-styled)
> > >    endif
> > >
> > >    ifeq ($(feature-libbfd-buildid), 1)
> > > @@ -1025,6 +1023,9 @@ ifdef HAVE_KVM_STAT_SUPPORT
> > >      CFLAGS += -DHAVE_KVM_STAT_SUPPORT
> > >  endif
> > >
> > > +$(call feature_check,disassembler-four-args)
> > > +$(call feature_check,disassembler-init-styled)
> > > +
> > >  ifeq ($(feature-disassembler-four-args), 1)
> > >      CFLAGS += -DDISASM_FOUR_ARGS_SIGNATURE
> > >  endif
> >
> > This I don't understand - why do we want these to run under NO_LIBBFD etc?
>
> when I was quickly testing that I did not have any of them detected
> and got compile fail.. so I moved it to safe place ;-) it might be
> placed in smarter place

I think that's because you'd removed them from FEATURE_TESTS_BASIC in
Makefile.feature. In v3 I just sent out I just removed them from
FEATURE_DISPLAY, without any more "structural" changes in
tools/perf/Makefile.config. 

Greetings,

Andres Freund