The no-dev option is deprecated.  Use -Wno-author instead.
CMake Warning (unused-cli):
  Manually-specified variables were not used by the project:

    CMAKE_LD_FLAGS
    ECM_MKSPECS_INSTALL_DIR


/var/pisi/kfilemetadata-6.30.0-94/work/kfilemetadata-6.30.0/src/extractors/appimageextractor.cpp: In constructor ‘DesktopFileParser::DesktopFileParser(const char*, const QString&)’:
/var/pisi/kfilemetadata-6.30.0-94/work/kfilemetadata-6.30.0/src/extractors/appimageextractor.cpp:204:24: warning: ignoring return value of ‘bool QTemporaryFile::open()’, declared with attribute ‘nodiscard’ [-Wunused-result]
  204 |     tmpDesktopFile.open();
      |     ~~~~~~~~~~~~~~~~~~~^~
In file included from /usr/include/qt6/QtCore/QTemporaryFile:1,
                 from /var/pisi/kfilemetadata-6.30.0-94/work/kfilemetadata-6.30.0/src/extractors/appimageextractor.cpp:14:
/usr/include/qt6/QtCore/qtemporaryfile.h:52:32: note: declared here
   52 |     QFILE_MAYBE_NODISCARD bool open() { return open(QIODevice::ReadWrite); }
      |                                ^~~~