On Thu, Sep 22, 2016 at 05:00:22PM +0200, Jiri Olsa wrote:

On Mon, Sep 19, 2016 at 09:28:20PM -0300, Arnaldo Carvalho de Melo wrote:

quoted

Em Mon, Sep 19, 2016 at 09:02:58PM -0300, Arnaldo Carvalho de Melo escreveu:

quoted

Em Mon, Sep 19, 2016 at 08:37:53PM -0300, Arnaldo Carvalho de Melo escreveu:

quoted

yeah, changing that typedef + true def to plain include <stdbool.h>
makes it progress to the next failure, which is in cross compilation
environments, such as using fedora 24 + the Android NDK to try to build
a ARM android binary.

quoted

14 fedora:24-x-ARC-uClibc: FAIL
  GEN      /tmp/build/perf/pmu-events/pmu-events.c
/bin/sh: /tmp/build/perf/pmu-events/jevents: cannot execute binary file: Exec format error
pmu-events/Build:11: recipe for target '/tmp/build/perf/pmu-events/pmu-events.c' failed
make[2]: *** [/tmp/build/perf/pmu-events/pmu-events.c] Error 126
Makefile.perf:461: recipe for target '/tmp/build/perf/pmu-events/pmu-events-in.o' failed
make[1]: *** [/tmp/build/perf/pmu-events/pmu-events-in.o] Error 2
make[1]: *** Waiting for unfinished jobs....

Jiri, we need something similar to scripts/Makefile.host :-\

Calling it a day, perhaps, for now, we should just detect that it is a
corss compile env (CROSS_COMPILE is set) and exclude all this code from
the build, emitting a warning.

I left what I did at the tmp.perf/core branch of my repo at
git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux.git.

as discussed on irc we will disable it for cross builds now,
because we dont have good solution at the moment.. it's
similar case as for fixdep tool:

    3a70fcd3a4db tools build: Fix cross compile build
    ...
    We need to add support for host side tools build, meanwhile
    disabling fixdep usage for cross arch builds.

I'll make a change to disable this for crossbuild and
work on common solution later

could you please give it a try with patch below?
I tested but not with properly cross building...

also,  did you want some message during the cross build that pmu-events are not included?

thanks,
jirka


---

diff --git a/tools/perf/Makefile.config b/tools/perf/Makefile.config
index 24803c58049a..ec3a59d9a56b 100644
--- a/tools/perf/Makefile.config
+++ b/tools/perf/Makefile.config

@@ -755,6 +755,10 @@ ifndef NO_AUXTRACE
   endif
 endif
 
+ifndef CROSS_COMPILE
+  CFLAGS += -DHAVE_PMU_EVENTS_SUPPORT
+endif
+
 # Among the variables below, these:
 #   perfexecdir
 #   template_dir

diff --git a/tools/perf/Makefile.perf b/tools/perf/Makefile.perf
index 0abebcba849f..85257c49d5ab 100644
--- a/tools/perf/Makefile.perf
+++ b/tools/perf/Makefile.perf

@@ -349,7 +349,14 @@ include $(srctree)/tools/build/Makefile.include
 
 JEVENTS       := $(OUTPUT)pmu-events/jevents
 JEVENTS_IN    := $(OUTPUT)pmu-events/jevents-in.o
+
+#
+# Disabling pmu-events for cross compile, as
+# we dont support host CC tools building yet.
+#
+ifndef CROSS_COMPILE
 PMU_EVENTS_IN := $(OUTPUT)pmu-events/pmu-events-in.o
+endif
 
 export JEVENTS
 

diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
index ac097fcaba7b..21a3f21a6f6f 100644
--- a/tools/perf/util/pmu.c
+++ b/tools/perf/util/pmu.c

@@ -482,6 +482,8 @@ static struct cpu_map *pmu_cpumask(const char *name)
 	return cpus;
 }
 
+#ifdef HAVE_PMU_EVENTS_SUPPORT
+
 /*
  * Return the CPU id as a raw string.
  *

@@ -545,6 +547,13 @@ out:
 	return 0;
 }
 
+#else
+static int pmu_add_cpu_aliases(struct list_head *head __maybe_unused)
+{
+	return 0;
+}
+#endif /* HAVE_PMU_EVENTS_SUPPORT */
+
 struct perf_event_attr * __weak
 perf_pmu__get_default_config(struct perf_pmu *pmu __maybe_unused)
 {