RFR: 8346436: Compilation with clang fails

[Jan Kratochvil]

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, ...) \
      | ^

-------------

Commit messages:
 - 8346436: Compilation with clang fails

Changes: https://git.openjdk.org/jdk/pull/22794/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=22794&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8346436
  Stats: 11 lines in 4 files changed: 8 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/22794.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22794/head:pull/22794

PR: https://git.openjdk.org/jdk/pull/22794