linux-kernel - Re: [PATCH 22/30] perf tools: bfd.h/libbfd detection fails with recent binutils

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Date:	Tue, 25 Sep 2012 08:47:28 +0200
From:	Markus Trippelsdorf <markus@...ppelsdorf.de>
To:	Mike Frysinger <vapier@...too.org>
Cc:	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org,
	Ingo Molnar <mingo@...hat.com>,
	Paul Mackerras <paulus@...ba.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: Re: [PATCH 22/30] perf tools: bfd.h/libbfd detection fails with
 recent binutils

On 2012.09.24 at 19:58 -0400, Mike Frysinger wrote:
> On Monday 24 September 2012 11:59:36 Arnaldo Carvalho de Melo wrote:
> > --- a/tools/perf/Makefile
> > +++ b/tools/perf/Makefile
> >
> > -		FLAGS_BFD=$(ALL_CFLAGS) $(ALL_LDFLAGS) $(EXTLIBS) -lbfd
> > +		FLAGS_BFD=$(ALL_CFLAGS) $(ALL_LDFLAGS) $(EXTLIBS) -DPACKAGE='perf' -
> 
> in this case, if you were to expand PACKAGE, you'd get back the symbol perf 
> (which most likely will be an error, but maybe it won't).  i think this should 
> be instead:
> 	-DPACKAGE='"perf"'
> 
> > --- a/tools/perf/util/symbol.h
> > +++ b/tools/perf/util/symbol.h
> >
> > +#define PACKAGE 'perf'
> 
> this isn't valid C anywhere.  pretty sure this should be:
> 	#define PACKAGE "perf"

The only thing that's really important is that PACKAGE isn't NULL,
because it's just a workaround for this brilliant gem from bfd.h:

  35 /* PR 14072: Ensure that config.h is included first.  */
  36 #if !defined PACKAGE && !defined PACKAGE_VERSION
  37 #error config.h must be included before this header
  38 #endif

So if you feel strongly about it, feel free to post a patch that just
sets PACKAGE to 1. This would avoid all possible ambiguity.

-- 
Markus
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