kde: port kf6-kcoreaddons to Redox + disable Python bindings across KF6

kf6-kcoreaddons (first KF6 framework to build on Redox) needed:
- LibMount made optional (was REQUIRED under CMAKE_SYSTEM_NAME==Linux, which the
  Redox cross toolchain reports); KMountPoint falls back to statfs (relibc has
  it). Same change in kf6-kio.
- BUILD_PYTHON_BINDINGS=OFF (pulled REQUIRED Python3/Shiboken6/PySide6 — dev-only,
  not on Redox). Applied to kf6-{kcoreaddons,knotifications,kwidgetsaddons,
  kguiaddons,kjobwidgets,kxmlgui}.
- kfilesystemtype.cpp: the inner OS #if chain had no #else so Redox got no
  determineFileSystemTypeImpl — added Q_OS_REDOX to the Q_OS_LINUX (statfs) arm
  and guarded <linux/magic.h> (the #ifndef fallbacks define every magic).
- clock-skew engine: CMakeLists compiled the _linux (timerfd) engine on Redox
  but engine.cpp's create() dispatches to the DBus engine when !Q_OS_LINUX —
  compile the _dbus engine on Redox instead so they agree.

local/recipes/kde/kf6-kcoreaddons/recipe.toml

@@ -36,6 +36,7 @@ cmake "${COOKBOOK_SOURCE}" \
     -DCMAKE_BUILD_TYPE=Release \
     -DCMAKE_PREFIX_PATH="${COOKBOOK_SYSROOT}" \
     -DBUILD_TESTING=OFF \
+    -DBUILD_PYTHON_BINDINGS=OFF \
     -DBUILD_QCH=OFF \
     -DKCOREADDONS_USE_QML=OFF \
     -DUSE_DBUS=ON \

local/recipes/kde/kf6-kcoreaddons/source/CMakeLists.txt

@@ -72,7 +72,13 @@ else()
 endif()
 
 if (CMAKE_SYSTEM_NAME MATCHES "Linux")
-    find_package(LibMount REQUIRED)
+    # LibMount (util-linux) parses the Linux mount table (/proc/mounts,
+    # /etc/mtab), which does not exist on Redox — the cross toolchain reports
+    # CMAKE_SYSTEM_NAME=Linux, so this branch runs there too. Make it optional:
+    # when libmount is absent, kfilesystemtype.cpp falls back to statfs(2) +
+    # f_type magic (relibc provides statfs on Redox), which is the correct
+    # filesystem-type path for a scheme-based OS with no mount table.
+    find_package(LibMount)
     set(HAVE_LIB_MOUNT ${LibMount_FOUND})
 endif()
 

local/recipes/kde/kf6-kcoreaddons/source/src/lib/CMakeLists.txt

@@ -186,7 +186,12 @@ target_sources(KF6CoreAddons PRIVATE
     util/kruntimeplatform.h
 )
 
-if(CMAKE_SYSTEM_NAME MATCHES "Linux" OR CMAKE_SYSTEM_NAME MATCHES "Android")
+# Redox reports CMAKE_SYSTEM_NAME=Linux but is NOT Q_OS_LINUX in Qt, so
+# ksystemclockskewnotifierengine.cpp's create() takes the #elif HAVE_QTDBUS
+# path. Compile the matching _dbus.cpp there (not the _linux.cpp timerfd engine),
+# so the two agree. Detect Redox via the cross compiler path since the system
+# name is Linux.
+if((CMAKE_SYSTEM_NAME MATCHES "Linux" OR CMAKE_SYSTEM_NAME MATCHES "Android") AND NOT CMAKE_CXX_COMPILER MATCHES "redox")
     target_sources(KF6CoreAddons PRIVATE util/ksystemclockskewnotifierengine_linux.cpp)
 elseif(HAVE_QTDBUS)
     target_sources(KF6CoreAddons PRIVATE util/ksystemclockskewnotifierengine_dbus.cpp)

local/recipes/kde/kf6-kcoreaddons/source/src/lib/io/kfilesystemtype.cpp

@@ -74,10 +74,19 @@ KFileSystemType::Type determineFileSystemTypeImpl(const QByteArray &path)
     return kde_typeFromName(buf.f_fstypename);
 }
 
-#elif defined(Q_OS_LINUX)
+#elif defined(Q_OS_LINUX) || defined(Q_OS_REDOX)
+// Redox provides statfs(2)/f_type via relibc, so it uses the same
+// magic-number path as Linux. The inner OS #if chain has no #else, so without
+// this a Redox build leaves determineFileSystemTypeImpl undefined. libmount and
+// udev are unavailable (HAVE_LIB_MOUNT/HAVE_UDEV are off), which the branch
+// already compiles cleanly without.
 #include <sys/statfs.h>
 
+#if !defined(Q_OS_REDOX)
 #include <linux/magic.h> // A lot of the filesystem superblock MAGIC numbers
+#endif
+// Redox has no <linux/magic.h>; the #ifndef fallbacks below define every magic
+// this file switches on, so the value table is complete without it.
 #include <sys/stat.h>
 
 // Add known missig magics

local/recipes/kde/kf6-kguiaddons/recipe.toml

@@ -35,6 +35,7 @@ cmake "${COOKBOOK_SOURCE}" \
     -DCMAKE_BUILD_TYPE=Release \
     -DCMAKE_PREFIX_PATH="${COOKBOOK_SYSROOT}" \
     -DBUILD_TESTING=OFF \
+    -DBUILD_PYTHON_BINDINGS=OFF \
     -DBUILD_QCH=OFF \
     -DWITH_WAYLAND=OFF \
     -DWITH_X11=OFF \

local/recipes/kde/kf6-kio/source/CMakeLists.txt

@@ -136,7 +136,10 @@ set_package_properties(ACL PROPERTIES DESCRIPTION "LibACL"
 
 # Used by KMountPoint
 if (CMAKE_SYSTEM_NAME MATCHES "Linux")
-    find_package(LibMount REQUIRED)
+    # Optional on Redox (no /proc/mounts mount table; the cross toolchain still
+    # reports CMAKE_SYSTEM_NAME=Linux). Without libmount, KMountPoint falls back
+    # to statfs(2), which relibc provides. See kf6-kcoreaddons for the rationale.
+    find_package(LibMount)
     set(HAVE_LIB_MOUNT ${LibMount_FOUND})
 endif()
 

local/recipes/kde/kf6-kjobwidgets/recipe.toml

@@ -39,6 +39,7 @@ cmake "${COOKBOOK_SOURCE}" \
     -DCMAKE_BUILD_TYPE=Release \
     -DCMAKE_PREFIX_PATH="${COOKBOOK_SYSROOT}" \
     -DBUILD_TESTING=OFF \
+    -DBUILD_PYTHON_BINDINGS=OFF \
     -DBUILD_QCH=OFF \
     -DUSE_DBUS=ON \
     -DWITH_X11=OFF \

local/recipes/kde/kf6-knotifications/recipe.toml

@@ -63,6 +63,7 @@ cmake "${COOKBOOK_SOURCE}" \
     -DCMAKE_BUILD_TYPE=Release \
     -DCMAKE_PREFIX_PATH="${COOKBOOK_SYSROOT}" \
     -DBUILD_TESTING=OFF \
+    -DBUILD_PYTHON_BINDINGS=OFF \
     -DBUILD_QCH=OFF \
     -DUSE_DBUS=ON \
     -Wno-dev

local/recipes/kde/kf6-kwidgetsaddons/recipe.toml

@@ -38,6 +38,7 @@ cmake "${COOKBOOK_SOURCE}" \
     -DCMAKE_BUILD_TYPE=Release \
     -DCMAKE_PREFIX_PATH="${COOKBOOK_SYSROOT}" \
     -DBUILD_TESTING=OFF \
+    -DBUILD_PYTHON_BINDINGS=OFF \
     -DBUILD_QCH=OFF \
     -Wno-dev
 

local/recipes/kde/kf6-kxmlgui/recipe.toml

@@ -65,6 +65,7 @@ cmake "${COOKBOOK_SOURCE}" \
     -DCMAKE_BUILD_TYPE=Release \
     -DCMAKE_PREFIX_PATH="${COOKBOOK_SYSROOT}" \
     -DBUILD_TESTING=OFF \
+    -DBUILD_PYTHON_BINDINGS=OFF \
     -DBUILD_QCH=OFF \
     -DBUILD_WITH_QML=OFF \
     -DUSE_DBUS=ON \