RFR: 8346436: Compilation with clang fails [v2]

[Alexey Ivanov]

On Fri, 3 Jan 2025 09:19:34 GMT, Jan Kratochvil <jkratochvil at openjdk.org> wrote:

>> clang-18.1.8-1.fc40.x86_64
>> Fedora 40 x86_64
>> fbd76ca8edd756ff2ebbc9f6477cc1a827df67b0
>> 
>> 
>> src/java.desktop/unix/native/libawt_xawt/xawt/XToolkit.c:695:9: error: ignoring return value of function declared with 'warn_unused_result' attribute [-Werror,-Wunused-result]
>>   695 | write ( AWT_WRITEPIPE, &wakeUp_char, 1 );
>>       | ^~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> src/java.desktop/unix/native/libsplashscreen/splashscreen_sys.c:375:9: error: ignoring return value of function declared with 'warn_unused_result' attribute [-Werror,-Wunused-result]
>>   375 | write(splash->controlpipe[1], &code, 1);
>>       | ^~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> src/java.desktop/unix/native/libsplashscreen/splashscreen_sys.c:713:5: error: ignoring return value of function declared with 'warn_unused_result' attribute [-Werror,-Wunused-result]
>>   713 | pipe(splash->controlpipe);
>>       | ^~~~ ~~~~~~~~~~~~~~~~~~~
>> src/jdk.crypto.cryptoki/share/native/libj2pkcs11/j2secmod.h:45:9: error: 'dprintf' macro redefined [-Werror,-Wmacro-redefined]
>>    45 | #define dprintf(s)
>>       | ^
>> /usr/include/bits/stdio2.h:121:12: note: previous definition is here
>>   121 | # define dprintf(fd, ...) \
>>       | ^
>> src/java.smartcardio/share/native/libj2pcsc/pcsc.c:48:9: error: 'dprintf' macro redefined [-Werror,-Wmacro-redefined]
>>    48 | #define dprintf(s)
>>       | ^
>> /usr/include/bits/stdio2.h:121:12: note: previous definition is here
>>   121 | # define dprintf(fd, ...) \
>>       | ^
>
> Jan Kratochvil has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains three additional commits since the last revision:
> 
>  - Use only (void) casts
>  - Merge branch 'master' into clangbuild
>  - 8346436: Compilation with clang fails

@jankratochvil Seemingly, the same problem is being addressed in #25217 for [JDK-8354316](https://bugs.openjdk.org/browse/JDK-8354316).

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PR Comment: https://git.openjdk.org/jdk/pull/22794#issuecomment-2900771105