linux-kernel - Re: [PATCH 1/2] perf tools: Fix build on powerpc broken by pt/bts

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Date:	Wed, 26 Aug 2015 09:25:48 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Adrian Hunter <adrian.hunter@...el.com>
Cc:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	linux-kernel@...r.kernel.org,
	Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
Subject: Re: [PATCH 1/2] perf tools: Fix build on powerpc broken by pt/bts

On Wed, Aug 26, 2015 at 09:57:13AM +0300, Adrian Hunter wrote:
> On 25/08/15 18:30, Arnaldo Carvalho de Melo wrote:
> > Em Tue, Aug 25, 2015 at 01:42:27PM +0300, Adrian Hunter escreveu:
> >> It is theoretically possible to process perf.data files created on
> >> x86 and that contain Intel PT or Intel BTS data, on any other
> >> architecture, which is why it is possible for there to be build
> >> errors on powerpc caused by pt/bts.
> >>
> >> The errors were:
> >>
> >> 	util/intel-pt-decoder/intel-pt-insn-decoder.c: In function ‘intel_pt_insn_decoder’:
> >> 	util/intel-pt-decoder/intel-pt-insn-decoder.c:138:3: error: switch missing default case [-Werror=switch-default]
> >> 	   switch (insn->immediate.nbytes) {
> >> 	   ^
> >> 	cc1: all warnings being treated as errors
> >>
> >> 	linux-acme.git/tools/perf/perf-obj/libperf.a(libperf-in.o): In function `intel_pt_synth_branch_sample':
> >> 	sources/linux-acme.git/tools/perf/util/intel-pt.c:871: undefined reference to `tsc_to_perf_time'
> >> 	linux-acme.git/tools/perf/perf-obj/libperf.a(libperf-in.o): In function `intel_pt_sample':
> >> 	sources/linux-acme.git/tools/perf/util/intel-pt.c:915: undefined reference to `tsc_to_perf_time'
> >> 	sources/linux-acme.git/tools/perf/util/intel-pt.c:962: undefined reference to `tsc_to_perf_time'
> >> 	linux-acme.git/tools/perf/perf-obj/libperf.a(libperf-in.o): In function `intel_pt_process_event':
> >> 	sources/linux-acme.git/tools/perf/util/intel-pt.c:1454: undefined reference to `perf_time_to_tsc'
> >>
> >> Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
> >> ---
> >>  tools/perf/util/Build                                    | 2 +-
> >>  tools/perf/util/intel-pt-decoder/intel-pt-insn-decoder.c | 3 +++
> >>  2 files changed, 4 insertions(+), 1 deletion(-)
> >>
> >> diff --git a/tools/perf/util/Build b/tools/perf/util/Build
> >> index e912856cc4e5..8ae31e5131ee 100644
> >> --- a/tools/perf/util/Build
> >> +++ b/tools/perf/util/Build
> >> @@ -74,7 +74,7 @@ libperf-y += stat-shadow.o
> >>  libperf-y += record.o
> >>  libperf-y += srcline.o
> >>  libperf-y += data.o
> >> -libperf-$(CONFIG_X86) += tsc.o
> >> +libperf-$(if $(CONFIG_X86)$(CONFIG_AUXTRACE),y) += tsc.o
> > 
> > I think this is preferred/more clear:
> > 
> > libperf-$(CONFIG_X86) += tsc.o
> > libperf-$(CONFIG_AUXTRACE) += tsc.o
> 
> I tried that first but it doesn't work:
> 
> util/tsc.o: In function `perf_time_to_tsc':
> /mnt/ssd/ahunter/git/linux-perf/tools/perf/util/tsc.c:7: multiple definition of `perf_time_to_tsc'
> util/tsc.o:/mnt/ssd/ahunter/git/linux-perf/tools/perf/util/tsc.c:7: first defined here
> util/tsc.o: In function `tsc_to_perf_time':
> /mnt/ssd/ahunter/git/linux-perf/tools/perf/util/tsc.c:18: multiple definition of `tsc_to_perf_time'
> util/tsc.o:/mnt/ssd/ahunter/git/linux-perf/tools/perf/util/tsc.c:18: first defined here
> make[3]: *** [util/libperf-in.o] Error 1
> make[2]: *** [util] Error 2
> make[1]: *** [libperf-in.o] Error 2
> make: *** [all] Error 2
> 
> I will have a look at why, unless Jiri knows?
> 

I'm now testing attached patch, does it fix it for you?

thanks,
jirka


---
diff --git a/tools/build/Makefile.build b/tools/build/Makefile.build
index 8120af9c0341..0c5f485521d6 100644
--- a/tools/build/Makefile.build
+++ b/tools/build/Makefile.build
@@ -63,7 +63,7 @@ quiet_cmd_gen = GEN      $@
 # If there's nothing to link, create empty $@ object.
 quiet_cmd_ld_multi = LD       $@
       cmd_ld_multi = $(if $(strip $(obj-y)),\
-		       $(LD) -r -o $@ $(obj-y),rm -f $@; $(AR) rcs $@)
+		       $(LD) -r -o $@  $(filter $(obj-y),$^),rm -f $@; $(AR) rcs $@)
 
 # Build rules
 $(OUTPUT)%.o: %.c FORCE
diff --git a/tools/build/tests/ex/Build b/tools/build/tests/ex/Build
index 70d876237c57..429c7d452101 100644
--- a/tools/build/tests/ex/Build
+++ b/tools/build/tests/ex/Build
@@ -1,6 +1,7 @@
 ex-y += ex.o
 ex-y += a.o
 ex-y += b.o
+ex-y += b.o
 ex-y += empty/
 ex-y += empty2/
 
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