[PATCH] perf record: Remove the '--(null)' long_name for --list-opts

From: Yunlong Song
Date: Mon Feb 16 2015 - 06:56:42 EST

If the long_name of a 'struct option' is defined as NULL, --list-opts
will incorrectly print '--(null)' in its output. As a result, '--(null)'
will finally appear in the case of bash completion, e.g. 'perf record --'.


Before this patch:

$ perf record --list-opts

--event --filter --pid --tid --realtime --no-buffering --raw-samples
--all-cpus --cpu --count --output --no-inherit --freq --mmap-pages
--group --(null) --call-graph --verbose --quiet --stat --data
--timestamp --period --no-samples --no-buildid-cache --no-buildid
--cgroup --delay --uid --branch-any --branch-filter --weight
--transaction --per-thread --intr-regs

After this patch:

$ perf record --list-opts

--event --filter --pid --tid --realtime --no-buffering --raw-samples
--all-cpus --cpu --count --output --no-inherit --freq --mmap-pages
--group --call-graph --verbose --quiet --stat --data --timestamp
--period --no-samples --no-buildid-cache --no-buildid --cgroup --delay
--uid --branch-any --branch-filter --weight --transaction --per-thread

Signed-off-by: Yunlong Song <yunlong.song@xxxxxxxxxx>
tools/perf/util/parse-options.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tools/perf/util/parse-options.c b/tools/perf/util/parse-options.c
index 4ee9a86..2bfe0b3 100644
--- a/tools/perf/util/parse-options.c
+++ b/tools/perf/util/parse-options.c
@@ -505,7 +505,8 @@ int parse_options_subcommand(int argc, const char **argv, const struct option *o
while (options->type != OPTION_END) {
- printf("--%s ", options->long_name);
+ if (options->long_name)
+ printf("--%s ", options->long_name);

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