[PATCH v2] perf tools: Fix cross compiling error

[Wang Nan]

Cross compiling perf to other platform failed due to missing symbol:

  ...
  AR       /pathofperf/libperf.a
  LD       /pathofperf/tests/perf-in.o
  LD       /pathofperf/perf-in.o
  LINK     /pathofperf/perf
/pathofperf/libperf.a(libperf-in.o): In function `intel_pt_synth_branch_sample':
/usr/src/kernel/tools/perf/util/intel-pt.c:899: undefined reference to `tsc_to_perf_time'
/pathofperf/libperf.a(libperf-in.o): In function `intel_pt_synth_transaction_sample':
/usr/src/kernel/tools/perf/util/intel-pt.c:992: undefined reference to `tsc_to_perf_time'
/pathofperf/libperf.a(libperf-in.o): In function `intel_pt_synth_instruction_sample':
/usr/src/kernel/tools/perf/util/intel-pt.c:943: undefined reference to `tsc_to_perf_time'
  ...

This is because we allow newly introduced intel-pt-decoder to be
compiled to not only X86, but tsc.c which required by it is compiled
for x86 only.

This patch fix the compiling error by allow tsc.c to be compiled if
CONFIG_AUXTRACE is set, no matter the target platform.

Comment from Arnaldo:

There were some changes in this area, i.e. x86 needs tsc, and auxtrace
as well, so both should express that via:

 libperf-$(CONFIG_X86) += tsc.o
 libperf-$(CONFIG_AUXTRACE) += tsc.o

Because on !x86 we want to process perf.data files containing Intel PT.

Signed-off-by: Wang Nan <wangnan0@xxxxxxxxxx>
Cc: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
 tools/perf/util/Build | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tools/perf/util/Build b/tools/perf/util/Build
index fd2f084..e712311 100644
--- a/tools/perf/util/Build
+++ b/tools/perf/util/Build
@@ -75,6 +75,7 @@ libperf-y += record.o
 libperf-y += srcline.o
 libperf-y += data.o
 libperf-$(CONFIG_X86) += tsc.o
+libperf-$(CONFIG_AUXTRACE) += tsc.o
 libperf-y += cloexec.o
 libperf-y += thread-stack.o
 libperf-$(CONFIG_AUXTRACE) += auxtrace.o
-- 
1.8.3.4

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