Re: [PATCH] perf tools: Fix build errors with mipsel-linux-uclibc compiler

[Alexey Brodkin <Alexey.Brodkin@synopsys.com>]

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Hello Stephane, Armaldo,

On Tue, 2015-09-22 at 00:06 +0300, Aaro Koskinen wrote:
> Hi,
> 
> On Mon, Sep 21, 2015 at 04:29:39PM +0000, Alexey Brodkin wrote:
> > > Em Fri, Sep 04, 2015 at 04:01:54PM -0700, Petri Gynther escreveu:
> > > > On Fri, Sep 4, 2015 at 3:48 PM, Arnaldo Carvalho de Melo
> > > > <ac...@kernel.org> wrote:
> > > > > Em Fri, Sep 04, 2015 at 03:45:03PM -0700, Petri Gynther escreveu:
> > > > > > This commit breaks the perf tool MIPS build because MIPS doesn't have
> > > > > > CONFIG_PERF_REGS=y in .config-detected:
> > > > > > 
> > > > > > commit bcc84ec65ad1bd9f777a1fade6f8e5e0c5808fa5
> > > > > > Author: Stephane Eranian <era...@google.com>
> > > > > > Date:   Mon Aug 31 18:41:12 2015 +0200
> > > > > > 
> > > > > >     perf record: Add ability to name registers to record
> > > > > 
> > > > > There was a fix for another arch that came after this one.. here it is, already
> > > > > upstream, can you take a look?
> > > > > 
> > > > > commit af4aeadd8c04303c0aa2d112145c3627e2ebd026
> > > > > Author: Stephane Eranian <era...@google.com>
> > > > > Date:   Tue Sep 1 11:30:14 2015 +0200
> > > > > 
> > > > >     perf tools: Fix link time error with sample_reg_masks on non x86
> > > > > 
> > > > >     This patch makes perf compile on non x86 platforms by defining a weak
> > > > >     symbol for sample_reg_masks[] in util/perf_regs.c.
> > > > > 
> > > > >     The patch also moves the REG() and REG_END() macros into the
> > > > >     util/per_regs.h header file. The macros are renamed to
> > > > >     SMPL_REG/SMPL_REG_END to avoid clashes with other header files.
> > > > > 
> > > > > 
> > > > 
> > > > I have the above commit in my tree (as I have the latest Linus' tree
> > > > as of right now).
> > > > The MIPS build is still broken as I reported.
> > > 
> > > Stephane, can you please take a look?
> > 
> > The same problem happens when building perf on ARC.
> > I'm on 4.3-rc2 and that's what I see:
> > ------------------->8-----------------
> >   LINK     .../linux-4.3-rc2/tools/perf/perf
> > .../linux-4.3-rc2/tools/perf/libperf.a(libperf-in.o): In function `parse_regs':
> > .../linux-4.3-rc2/tools/perf/util/parse-regs-options.c:28: undefined reference to `sample_reg_masks'
> > .../linux-4.3-rc2/tools/perf/util/parse-regs-options.c:45: undefined reference to `sample_reg_masks'
> > .../linux-4.3-rc2/tools/perf/util/parse-regs-options.c:38: undefined reference to `sample_reg_masks'
> > collect2: error: ld returned 1 exit status
> > ------------------->8-----------------
> > 
> > Any chance for this to be discussed any further?
> 
> Also (with 4.3-rc2) on PA-RISC, PowerPC and SPARC the same errors are
> seen. 4.2 builds fine.

Any chance to take a look at this issue?

It's already 4.3-rc3 so it would be nice to get some fix to try so there will be time
to make sure that new fix doesn't break stuff for other arches.

Regards,
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