linux-kernel - Re: [patch] perf: Fix build failure on OpenSuse userspace

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Message-ID: <20120504152613.GB2995@m.brq.redhat.com>
Date:	Fri, 4 May 2012 17:26:13 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Lucas De Marchi <lucas.de.marchi@...il.com>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Greg KH <gregkh@...uxfoundation.org>,
	Arnaud Lacombe <lacombar@...il.com>,
	David Miller <davem@...emloft.net>, namhyung.kim@....com,
	a.p.zijlstra@...llo.nl, paulus@...ba.org, mingo@...hat.com,
	acme@...stprotocols.net, linux-kernel@...r.kernel.org
Subject: Re: [patch] perf: Fix build failure on OpenSuse userspace

On Fri, May 04, 2012 at 12:10:55PM -0300, Lucas De Marchi wrote:
> On Fri, May 4, 2012 at 4:09 AM, Ingo Molnar <mingo@...nel.org> wrote:
> >
> > * Greg KH <gregkh@...uxfoundation.org> wrote:
> >
> >> On Thu, May 03, 2012 at 11:01:54PM -0400, Arnaud Lacombe wrote:
> >> > Hi,
> >> >
> >> > On Thu, May 3, 2012 at 10:47 PM, Greg KH <gregkh@...uxfoundation.org> wrote:
> >> > > On Thu, May 03, 2012 at 10:35:02PM -0400, Arnaud Lacombe wrote:
> >> > >> Hi,
> >> > >>
> >> > >> On Thu, May 3, 2012 at 10:29 PM, Arnaud Lacombe <lacombar@...il.com> wrote:
> >> > >> > [...]
> >> > >> > [0]: http://pkgs.fedoraproject.org/gitweb/?p=flex.git;a=blob;f=flex-2.5.35-hardening.patch;h=7d608ea2371fa3295bdb8eb97c15eeb03029c02b;hb=HEAD
> >> > >> >
> >> > >> as a side note, this patch sounds more being about "silencing" than
> >> > >> "hardening"...
> >> > >
> >> > > That's nice, but I can build the perf version in 3.3 just fine, so
> >> > > something broke here (hint, build regression.)  Do I have to bisect it
> >> > > down to find the problem?
> >> > >
> >> > there is most likely nothing to bisect, `perf' seems to have never
> >> > required any parser before 3.4. The way the rest of the tools
> >> > (especially `kconfig', `genksyms' and `dtc') manage parsers is via
> >> > pre-generated .[ch]_shipped version of the lexer/tokenizer. It's been
> >> > working well for a long time as such. `perf' will certainly have to
> >> > follow the same path.
> >>
> >> Well, it can allow bison to run, but just don't break the build if the
> >> generated code it creates happens to contain warnings.
> >>
> >> I'm using bison 2.5 and flex 2.5.35, and my phone number is...
> >>
> >> Like this really matters?  This needs to work for everyone, if not, you
> >> better put the specific version numbers you need to require in the
> >> Documentation/Changes file.
> >>
> >> So, how do I fix this?
> >
> > Does the (untested) patch below help?
> >
> > If not then please paste me the build failure output (it will
> > most likely change due to the patch), and until we fix this
> > build regression on OpenSuse userspace you can work it around
> > via:
> >
> >  make WERROR=0
> >
> > Thanks,
> >
> >        Ingo
> >
> > diff --git a/tools/perf/Makefile b/tools/perf/Makefile
> > index 7055a00..3174e9b 100644
> > --- a/tools/perf/Makefile
> > +++ b/tools/perf/Makefile
> > @@ -729,10 +729,10 @@ $(OUTPUT)perf.o perf.spec \
> >  # over the general rule for .o
> >
> >  $(OUTPUT)util/%-flex.o: $(OUTPUT)util/%-flex.c $(OUTPUT)PERF-CFLAGS
> > -       $(QUIET_CC)$(CC) -o $@ -c $(ALL_CFLAGS) -Iutil/ -Wno-redundant-decls -Wno-switch-default -Wno-unused-function $<
> > +       $(QUIET_CC)$(CC) -o $@ -c $(ALL_CFLAGS) -Iutil/ -Wno-redundant-decls -Wno-switch-default -Wno-unused-function -Wno-unused-parameter $<
> 
> Nah. What you need is -Wno-sign-compare.
> 
> But you are better off overriding the CFLAGS for these generated
> files. Just put -Wno-error as the last one (untested, but should work)

yep, I think it's good idea..  and plus '-w' to suppres warnings not to
polute the build log

jirka


---
diff --git a/tools/perf/Makefile b/tools/perf/Makefile
index 7055a00..9c734a2 100644
--- a/tools/perf/Makefile
+++ b/tools/perf/Makefile
@@ -729,10 +729,10 @@ $(OUTPUT)perf.o perf.spec \
 # over the general rule for .o
 
 $(OUTPUT)util/%-flex.o: $(OUTPUT)util/%-flex.c $(OUTPUT)PERF-CFLAGS
-	$(QUIET_CC)$(CC) -o $@ -c $(ALL_CFLAGS) -Iutil/ -Wno-redundant-decls -Wno-switch-default -Wno-unused-function $<
+	$(QUIET_CC)$(CC) -o $@ -c $(ALL_CFLAGS) -Iutil/ -Wno-error -w $<
 
 $(OUTPUT)util/%-bison.o: $(OUTPUT)util/%-bison.c $(OUTPUT)PERF-CFLAGS
-	$(QUIET_CC)$(CC) -o $@ -c $(ALL_CFLAGS) -DYYENABLE_NLS=0 -DYYLTYPE_IS_TRIVIAL=0 -Iutil/ -Wno-redundant-decls -Wno-switch-default -Wno-unused-function $<
+	$(QUIET_CC)$(CC) -o $@ -c $(ALL_CFLAGS) -DYYENABLE_NLS=0 -DYYLTYPE_IS_TRIVIAL=0 -Iutil/ -Wno-error -w $<
 
 $(OUTPUT)%.o: %.c $(OUTPUT)PERF-CFLAGS
 	$(QUIET_CC)$(CC) -o $@ -c $(ALL_CFLAGS) $<
--
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