tests: Fix test 3 thread failure

[king258436]

Fix tests/s-thread.c failure from compiler optimization in ubuntu24.04

$ clang -v
Ubuntu clang version 18.1.3 (1ubuntu1)

t003_thread: diff result of clang -pg -O3 
--- expect      2024-09-02 21:38:09.576036102 +0900
+++ result      2024-09-02 21:38:09.576036102 +0900
@@ -21,4 +21,2 @@
      b() {
-       c() {
-       } /* c */
      } /* b */
@@ -29,4 +27,2 @@
      b() {
-       c() {
-       } /* c */
      } /* b */
@@ -37,4 +33,2 @@
      b() {
-       c() {
-       } /* c */
      } /* b */
@@ -45,4 +39,2 @@
      b() {
-       c() {
-       } /* c */
      } /* b */

003 thread              : OK OK OK OK OK  OK OK OK NG OK

[namhyung]

Looks good to me. But can you please add a compiler warning or something to say why it failed? See commit 887f8d2 for example.

[MichelleJin12]

Hi @king258436

You can run
python3 runtest.py 003
python3 runtest.py 003 -c clang -O 3 -p -v
to generate expect and result outputs

[kzall0c]

Thank you @king258436! You can find the verbose results with -vdp options. See #1580

[king258436]

Looks good to me. But can you please add a compiler warning or something to say why it failed? See commit 887f8d2 for example.

I have updated your feedback. Thank you @namhyung very much for the review.