Change #271217

Comments

servers: silence `-Wunused-result` with pragma
In some configurations the `write()` functions gets the
`warn_unused_result` attribute, that makes casting to `(void)`
ineffective to silence this warning. Seen with glibc, in 5 CI jobs.
The warning option appeared in GCC 4.5 and comes enabled by default.

```
tests/server/util.c:329:5: error: ignoring return value of ‘write’ declared with attribute ‘warn_unused_result’ [-Werror=unused-result]
  329 |     write(STDERR_FILENO, msg, sizeof(msg) - 1);
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
```
Ref: https://github.com/curl/curl/actions/runs/27548333990/job/81427544632

Refs:
https://github.com/curl/curl/pull/22023#issuecomment-4708455631
https://gcc.gnu.org/onlinedocs/gcc-16.1.0/gcc/Warning-Options.html#index-Wunused-result
https://gcc.gnu.org/onlinedocs/gcc-16.1.0/gcc/Common-Attributes.html#index-warn_005funused_005fresult
https://stackoverflow.com/questions/40576003/ignoring-warning-wunused-result

Follow-up to c8d8f081fd62c68c588f8963a8e441c730a23b5b #22023
Follow-up to e95f509c66abdd88ae02e3243cdc217f19c4a330 #16852

Closes #22034

Changed files

• tests/server/util.c