Re: [PATCH v2] perf tools: Fix cross compiling error

From: Adrian Hunter
Date: Mon Aug 31 2015 - 14:43:57 EST

On 31/08/2015 5:20 p.m., Arnaldo Carvalho de Melo wrote:
Em Mon, Aug 31, 2015 at 02:09:41PM +0000, Wang Nan escreveu:
Cross compiling perf to other platform failed due to missing symbol:

Adrian, I think this one covers what you would resend, no? If it does,
can I have your Acked-by?

There was another chunk as well so I sent V2 of the other patch.

- Arnaldo

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 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
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