On 12/18/2017 4:49 PM, Stefan Beller wrote:
I was compiling origin/master today with stricter compiler flags today
and was greeted by
t/helper/test-lazy-init-name-hash.c: In function ‘cmd_main’:
t/helper/test-lazy-init-name-hash.c:172:5: error: ‘nr_threads_used’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
printf("avg [size %8d] [single %f] %c [multi %f %d]\n",
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
nr,
~~~
(double)avg_single/1000000000,
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
(avg_single < avg_multi ? '<' : '>'),
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
(double)avg_multi/1000000000,
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
nr_threads_used);
~~~~~~~~~~~~~~~~
t/helper/test-lazy-init-name-hash.c:115:6: note: ‘nr_threads_used’ was declared here
int nr_threads_used;
^~~~~~~~~~~~~~~
I do not see how we can arrive at that line without having `nr_threads_used`
initialized, as we'd have `count > 1` (which asserts that we ran the
loop above at least once, such that it *should* be initialized).
I do not have time to dive into further analysis.
Signed-off-by: Stefan Beller <sbeller@xxxxxxxxxx>
---
t/helper/test-lazy-init-name-hash.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/t/helper/test-lazy-init-name-hash.c b/t/helper/test-lazy-init-name-hash.c
index 6368a89345..297fb01d61 100644
--- a/t/helper/test-lazy-init-name-hash.c
+++ b/t/helper/test-lazy-init-name-hash.c
@@ -112,7 +112,7 @@ static void analyze_run(void)
{
uint64_t t1s, t1m, t2s, t2m;
int cache_nr_limit;
- int nr_threads_used;
+ int nr_threads_used = 0;
int i;
int nr;
Agreed. It should not be a problem. Explicitly initializing it is fine.
Signed-off-by: Jeff Hostetler <jeffhost@xxxxxxxxxxxxx>
