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Subject[PATCH 3/3] perf build: Fix traceevent plugins build race
Date
Ingo reported following build failure:

$ make clean install
...
CC plugin_kmem.o
fixdep: error opening depfile: ./.plugin_hrtimer.o.d: No such file or directory
/home/mingo/tip/tools/build/Makefile.build:77: recipe for target
'plugin_hrtimer.o' failed
make[3]: *** [plugin_hrtimer.o] Error 2
Makefile:189: recipe for target 'plugin_hrtimer-in.o' failed
make[2]: *** [plugin_hrtimer-in.o] Error 2
Makefile.perf:414: recipe for target 'libtraceevent_plugins' failed
make[1]: *** [libtraceevent_plugins] Error 2
make[1]: *** Waiting for unfinished jobs....

Currently we have the install-traceevent-plugins target being
dependent on $(LIBTRACEEVENT), which will actualy not build
any plugin. So the install-traceevent-plugins target itself
will try to build plugins, but..

Plugins built is also triggered by perf build itself via
libtraceevent_plugins target.

This might cause a race having one make thread removing
temp files from another and result in above error. Fixing
this by having proper plugins build dependency before
installing plugins.

Reported-and-Tested-by:: Ingo Molnar <mingo@kernel.org>
Link: http://lkml.kernel.org/n/tip-8mlj1skxxg89p4bpo6qnt930@git.kernel.org
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
tools/perf/Makefile.perf | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/Makefile.perf b/tools/perf/Makefile.perf
index d2b20a1f4a21..7338a7e62fcd 100644
--- a/tools/perf/Makefile.perf
+++ b/tools/perf/Makefile.perf
@@ -420,7 +420,7 @@ $(LIBTRACEEVENT)-clean:
$(call QUIET_CLEAN, libtraceevent)
$(Q)$(MAKE) -C $(TRACE_EVENT_DIR) O=$(OUTPUT) clean >/dev/null

-install-traceevent-plugins: $(LIBTRACEEVENT)
+install-traceevent-plugins: libtraceevent_plugins
$(Q)$(MAKE) -C $(TRACE_EVENT_DIR) $(LIBTRACEEVENT_FLAGS) O=$(OUTPUT) install_plugins

$(LIBAPI): fixdep FORCE
--
2.4.3


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