Fix FTCBFS (Closes: #1023054).

debian/changelog

@@ -3,6 +3,15 @@ qt6-base (6.4.2+dfsg-1) UNRELEASED; urgency=medium
   [ Patrick Franz ]
   * Switch to the official 6.4.2 tarball, the tarball is the same.
 
+  [ Helmut Grohne ]
+  * Fix FTCBFS: Pass QT_HOST_PATH. (Closes: #1023054)
+    + cross.patch: Honour PKG_CONFIG_EXECUTABLE
+    + cross.patch: Allow building android tools
+    + Pass QT_HOST_* variables to build.
+    + Depend on a native qt toolchain for the former.
+    + Do build tools even when cross building.
+    + Add excess files to debian/not-installed.
+
  -- Debian Qt/KDE Maintainers <debian-qt-kde@lists.debian.org>  Sat, 21 Jan 2023 13:42:21 +0100
 
 qt6-base (6.4.2+dfsg~rc1-3) unstable; urgency=medium

debian/control

@@ -71,6 +71,7 @@ Build-Depends: cmake (>= 3.24~),
                ninja-build,
                pkg-config,
                pkg-kde-tools (>= 0.15.17~),
+               qt6-base-dev:native <cross>,
                unixodbc-dev,
                zlib1g-dev,
 Standards-Version: 4.6.2

debian/not-installed

@@ -8,3 +8,8 @@ usr/lib/${DEB_HOST_MULTIARCH}/cmake/Qt6PrintSupport/Qt6PrintSupportPlugins.cmake
 usr/lib/${DEB_HOST_MULTIARCH}/cmake/Qt6Sql/Qt6SqlPlugins.cmake
 usr/lib/qt6/bin/qmake
 usr/lib/qt6/bin/qtpaths
+# cross build specific:
+usr/lib/qt6/bin/host-qmake
+usr/lib/qt6/bin/host-qtpaths
+usr/lib/qt6/bin/target_qt.conf
+usr/lib/${DEB_HOST_MULTIARCH}/qt6/mkspecs/qdevice.pri

debian/patches/cross.patch

@@ -0,0 +1,22 @@
+--- a/cmake/QtBuildInternals/QtBuildInternalsConfig.cmake
++++ b/cmake/QtBuildInternals/QtBuildInternalsConfig.cmake
+@@ -146,8 +146,6 @@
+     set(FEATURE_pkg_config "${pkg_config_enabled}" CACHE STRING "Using pkg-config")
+     if(NOT pkg_config_enabled)
+         qt_build_internals_disable_pkg_config()
+-    else()
+-        unset(PKG_CONFIG_EXECUTABLE CACHE)
+     endif()
+ endfunction()
+ 
+--- a/src/tools/configure.cmake
++++ b/src/tools/configure.cmake
+@@ -2,7 +2,7 @@
+     SECTION "Deployment"
+     LABEL "Android deployment tool"
+     PURPOSE "The Android deployment tool automates the process of creating Android packages."
+-    CONDITION NOT CMAKE_CROSSCOMPILING AND QT_FEATURE_regularexpression)
++    CONDITION QT_FEATURE_regularexpression)
+ 
+ qt_feature("macdeployqt" PRIVATE
+     SECTION "Deployment"

debian/patches/series

@@ -5,6 +5,7 @@ upstream_Add-M68k-detection.patch
 # Debian specific
 remove_privacy_breaches.diff
 build_path_embedded_qtbuildinternalsextra_cmake.patch
+cross.patch
 
 # Don't use yield on CPUs that might not support it
 armel-noyield.patch

debian/rules

@@ -19,6 +19,14 @@ else
         extra_cmake_args += -DFEATURE_sctp=OFF
 endif
 
+# cross-builds
+ifneq ($(DEB_BUILD_ARCH),$(DEB_HOST_ARCH))
+	extra_cmake_args += \
+		-DQT_HOST_PATH=/usr \
+		-DQT_HOST_PATH_CMAKE_DIR=/usr/lib/${DEB_BUILD_MULTIARCH}/cmake \
+		-DQT_BUILD_TOOLS_WHEN_CROSSCOMPILING=ON
+endif
+
 %:
 	dh $@ --with pkgkde_symbolshelper --buildsystem=cmake+ninja