This ended up triggering these warnings when building on Ubuntu 12.04.5:
util/scripting-engines/trace-event-perl.c: In function 'perl_process_callchain':
util/scripting-engines/trace-event-perl.c:293:4: error: value computed is not used [-Werror=unused-value]
util/scripting-engines/trace-event-perl.c:294:4: error: value computed is not used [-Werror=unused-value]
util/scripting-engines/trace-event-perl.c:295:4: error: value computed is not used [-Werror=unused-value]
util/scripting-engines/trace-event-perl.c:297:4: error: value computed is not used [-Werror=unused-value]
util/scripting-engines/trace-event-perl.c:309:4: error: value computed is not used [-Werror=unused-value]
cc1: all warnings being treated as errors
mv: cannot stat `/tmp/build/perf/util/scripting-engines/.trace-event-perl.o.tmp': No such file or directory
make[4]: *** [/tmp/build/perf/util/scripting-engines/trace-event-perl.o] Error 1
Fix it by doing error checking when building the perl data structures
related to callchains.
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Dima Kogan <dima@secretsauce.net>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@gmail.com>
Fixes: f7380c12ec ("perf script perl: Perl scripts now get a backtrace, like the python ones")
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
76e20522b7