On Mon, May 11, 2015 at 09:35:26AM +0000, He Kuang wrote: > Traceevent plugins need dynamic symbols exported from libtraceevent.a, > otherwise a dlopen error will occur during plugins loading. > > This patch uses dynamic-list-file to export dynamic symbols which will > be used in plugins to perf executable. > > The problem is covered up if feature-libpython is enabled, because > PYTHON_EMBED_LDOPTS contains '-Xlinker --export-dynamic' which adds all > symbols to the dynamic symbol table. So we should reproduce the problem > by setting NO_LIBPYTHON=1.
there's was another patch taking the shortcut: http://marc.info/?l=linux-kernel&m=142885447432384&w=2 it seems it's not merged yet, but I like this one better SNIP > diff --git a/tools/perf/Makefile.perf b/tools/perf/Makefile.perf > index 03409cc..19c61e0 100644 > --- a/tools/perf/Makefile.perf > +++ b/tools/perf/Makefile.perf > @@ -172,6 +172,7 @@ endif > > LIBTRACEEVENT = $(TE_PATH)libtraceevent.a > export LIBTRACEEVENT > +LIBTRACEEVENT_DYNAMIC_LIST = $(TE_PATH)libtraceevent-dynamic-list > > LIBAPI = $(LIB_PATH)libapi.a > export LIBAPI > @@ -278,8 +279,9 @@ build := -f $(srctree)/tools/build/Makefile.build dir=. > obj > $(PERF_IN): $(OUTPUT)PERF-VERSION-FILE $(OUTPUT)common-cmds.h FORCE > $(Q)$(MAKE) $(build)=perf > > -$(OUTPUT)perf: $(PERFLIBS) $(PERF_IN) > - $(QUIET_LINK)$(CC) $(CFLAGS) $(LDFLAGS) $(PERF_IN) $(LIBS) -o $@ > +LD_LIBTRACEEVENT_FLAGS += -Xlinker > --dynamic-list=$(LIBTRACEEVENT_DYNAMIC_LIST) > +$(OUTPUT)perf: $(PERFLIBS) $(PERF_IN) $(LIBTRACEEVENT_DYNAMIC_LIST) > + $(QUIET_LINK)$(CC) $(CFLAGS) $(LDFLAGS) $(LD_LIBTRACEEVENT_FLAGS) > $(PERF_IN) $(LIBS) -o $@ > > $(GTK_IN): FORCE > $(Q)$(MAKE) $(build)=gtk > @@ -375,6 +377,9 @@ LIBTRACEEVENT_FLAGS += plugin_dir=$(plugindir_SQ) > $(LIBTRACEEVENT): FORCE > $(Q)$(MAKE) -C $(TRACE_EVENT_DIR) $(LIBTRACEEVENT_FLAGS) O=$(OUTPUT) > $(OUTPUT)libtraceevent.a plugins > > +$(LIBTRACEEVENT_DYNAMIC_LIST): $(LIBTRACEEVENT) > + $(Q)$(MAKE) -C $(TRACE_EVENT_DIR) $(LIBTRACEEVENT_FLAGS) O=$(OUTPUT) > $(OUTPUT)libtraceevent-dynamic-list hum, do we need extra target in Makefile.perf, it could be rebuilt any time 'plugins:' target in lib/tracevent/Makefile is called jirka -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
