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/kio-6.31.0-102/work/kio-6.31.0/src/core/kmountpoint.cpp: In member function ‘bool KMountPoint::probablySlow() const’:
/var/pisi/kio-6.31.0-102/work/kio-6.31.0/src/core/kmountpoint.cpp:751:50: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses]
  751 |         || d->m_mountType.startsWith("fuse."_L1) && !d->m_mountedFrom.startsWith("/dev/"_L1);
      |            ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/var/pisi/kio-6.31.0-102/work/kio-6.31.0/src/core/workerinterface.cpp:38:24: warning: ‘KIO::filesize_t readFilesize_t(QDataStream&)’ defined but not used [-Wunused-function]
   38 | static KIO::filesize_t readFilesize_t(QDataStream &stream)
      |                        ^~~~~~~~~~~~~~
/var/pisi/kio-6.31.0-102/work/kio-6.31.0/src/kioworkers/help/main.cpp: In function ‘int kdemain(int, char**)’:
/var/pisi/kio-6.31.0-102/work/kio-6.31.0/src/kioworkers/help/main.cpp:56:33: warning: ‘int xmlSubstituteEntitiesDefault(int)’ is deprecated [-Wdeprecated-declarations]
   56 |     xmlSubstituteEntitiesDefault(1);
      |     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~
In file included from /usr/include/libxml2/libxml/tree.h:17,
                 from /usr/include/libxml2/libxml/HTMLtree.h:16,
                 from /var/pisi/kio-6.31.0-102/work/kio-6.31.0/src/kioworkers/help/main.cpp:20:
/usr/include/libxml2/libxml/parser.h:953:17: note: declared here
  953 |                 xmlSubstituteEntitiesDefault(int val);
      |                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/var/pisi/kio-6.31.0-102/work/kio-6.31.0/src/kioworkers/help/main_ghelp.cpp: In function ‘int kdemain(int, char**)’:
/var/pisi/kio-6.31.0-102/work/kio-6.31.0/src/kioworkers/help/main_ghelp.cpp:49:33: warning: ‘int xmlSubstituteEntitiesDefault(int)’ is deprecated [-Wdeprecated-declarations]
   49 |     xmlSubstituteEntitiesDefault(1);
      |     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~
In file included from /usr/include/libxml2/libxml/tree.h:17,
                 from /usr/include/libxml2/libxml/HTMLtree.h:16,
                 from /var/pisi/kio-6.31.0-102/work/kio-6.31.0/src/kioworkers/help/main_ghelp.cpp:16:
/usr/include/libxml2/libxml/parser.h:953:17: note: declared here
  953 |                 xmlSubstituteEntitiesDefault(int val);
      |                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/var/pisi/kio-6.31.0-102/work/kio-6.31.0/src/gui/kemailclientlauncherjob.cpp: In member function ‘QStringList KEMailClientLauncherJob::thunderbirdArguments() const’:
/var/pisi/kio-6.31.0-102/work/kio-6.31.0/src/gui/kemailclientlauncherjob.cpp:191:10: warning: variable ‘addString’ set but not used [-Wunused-but-set-variable]
  191 |     auto addString = [&](const char *token, const QString &str) {
      |          ^~~~~~~~~
/var/pisi/kio-6.31.0-102/work/kio-6.31.0/src/kioworkers/file/file.cpp: In member function ‘KIO::WorkerResult FileProtocol::unmount(const QString&)’:
/var/pisi/kio-6.31.0-102/work/kio-6.31.0/src/kioworkers/file/file.cpp:924:11: warning: ignoring return value of ‘int system(const char*)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
  924 |     system(buffer.constData());
      |     ~~~~~~^~~~~~~~~~~~~~~~~~~~