package/qt6/qt6tools: avoid build failures

Since we don't need assistant, designer or linguist on target, and we
don't need assistant or designer on host, we unconditionally disable
these tools, to avoid build failures without inreasing the complexity of
the package.

Fixes target linguist build:
-- Could NOT find Qt6LinguistTools (missing: Qt6LinguistTools_DIR)
CMake Error at <...>/output/build/qt6base-6.8.1/cmake/QtToolHelpers.cmake:768 (message):
  Failed to find the host tool "Qt6::lconvert".  It is part of the
  Qt6LinguistTools package, but the package could not be found.  Make sure
  you have built and installed the host Linguist module, which will ensure
  the creation of the Qt6LinguistTools package.
Call Stack (most recent call first):
  <...>/output/build/qt6base-6.8.1/cmake/QtToolHelpers.cmake:83 (qt_internal_find_tool)
  src/linguist/lconvert/CMakeLists.txt:9 (qt_internal_add_tool)

The following defconfig triggers a target linguist build without
building the necessary lconvert host tool. See:
https://code.qt.io/cgit/qt/qttools.git/tree/src/linguist/CMakeLists.txt?h=6.8.1#n17

BR2_arm=y
BR2_cortex_a9=y
BR2_ARM_ENABLE_VFP=y
BR2_TOOLCHAIN_EXTERNAL=y
BR2_TOOLCHAIN_EXTERNAL_BOOTLIN=y
BR2_TOOLCHAIN_EXTERNAL_BOOTLIN_ARMV7_EABIHF_MUSL_STABLE=y
BR2_PACKAGE_QT6=y
BR2_PACKAGE_QT6BASE_GUI=y
BR2_PACKAGE_QT6BASE_PNG=y
BR2_PACKAGE_QT6BASE_WIDGETS=y
BR2_PACKAGE_QT6TOOLS=y

Fixes target designer build:
CMake Error at <...>/output/build/qt6base-6.8.1/cmake/QtPublicWalkLibsHelpers.cmake:267 (message):
  The Xml target is mentioned as a dependency for Designer, but not declared.
Call Stack (most recent call first):
  <...>/output/build/qt6base-6.8.1/cmake/QtPrlHelpers.cmake:8 (__qt_internal_walk_libs)
  <...>/output/build/qt6base-6.8.1/cmake/QtPrlHelpers.cmake:47 (qt_collect_libs)
  <...>/buildroot/output/build/qt6base-6.8.1/cmake/QtModuleHelpers.cmake:1027 (qt_generate_prl_file)
  <...>/buildroot/output/build/qt6base-6.8.1/cmake/QtScopeFinalizerHelpers.cmake:24:EVAL:1 (qt_finalize_module)
  src/designer/src/lib/CMakeLists.txt:DEFERRED

The following defconfig triggers a target designer build, without
selecting the necessary xml qt6base option. See:
https://code.qt.io/cgit/qt/qttools.git/tree/configure.cmake?h=6.8.1#n64
https://code.qt.io/cgit/qt/qttools.git/tree/src/designer/src/lib/CMakeLists.txt?h=6.8.1#n182

BR2_arm=y
BR2_cortex_a9=y
BR2_ARM_ENABLE_VFP=y
BR2_TOOLCHAIN_EXTERNAL=y
BR2_TOOLCHAIN_EXTERNAL_BOOTLIN=y
BR2_TOOLCHAIN_EXTERNAL_BOOTLIN_ARMV7_EABIHF_MUSL_STABLE=y
BR2_PACKAGE_QT6=y
BR2_PACKAGE_QT6BASE_GUI=y
BR2_PACKAGE_QT6BASE_PNG=y
BR2_PACKAGE_QT6BASE_WIDGETS=y
BR2_PACKAGE_QT6TOOLS=y

Fixes target assistant build:
CMake Error at <...>/output/build/qt6base-6.8.1/cmake/QtToolHelpers.cmake:768 (message):
  Failed to find the host tool "Qt6::qhelpgenerator".  It is part of the
  Qt6ToolsTools package, but the package did not contain the tool.  Make sure
  that the host module Tools was built with all features enabled (no
  explicitly disabled tools).
Call Stack (most recent call first):
  <...>/buildroot/output/build/qt6base-6.8.1/cmake/QtToolHelpers.cmake:83 (qt_internal_find_tool)
  src/assistant/qhelpgenerator/CMakeLists.txt:9 (qt_internal_add_tool)

The following defconfig triggers a target assistant build, without
building the necessary qhelpgenerator host tool. See:
https://code.qt.io/cgit/qt/qttools.git/tree/configure.cmake?h=6.8.1#n45
https://code.qt.io/cgit/qt/qttools.git/tree/src/assistant/CMakeLists.txt?h=6.8.1#n4
https://code.qt.io/cgit/qt/qttools.git/tree/src/assistant/CMakeLists.txt?h=6.8.1#n21

BR2_arm=y
BR2_cortex_a9=y
BR2_ARM_ENABLE_VFP=y
BR2_TOOLCHAIN_EXTERNAL=y
BR2_TOOLCHAIN_EXTERNAL_BOOTLIN=y
BR2_TOOLCHAIN_EXTERNAL_BOOTLIN_ARMV7_EABIHF_MUSL_STABLE=y
BR2_PACKAGE_QT6=y
BR2_PACKAGE_QT6BASE_GUI=y
BR2_PACKAGE_QT6BASE_PNG=y
BR2_PACKAGE_QT6BASE_PRINTSUPPORT=y
BR2_PACKAGE_QT6BASE_SQL=y
BR2_PACKAGE_QT6BASE_SQLITE=y
BR2_PACKAGE_QT6BASE_WIDGETS=y
BR2_PACKAGE_QT6TOOLS=y

Signed-off-by: Roy Kollen Svendsen <roykollensvendsen@gmail.com>
Signed-off-by: Arnout Vandecappelle <arnout@rnout.be>

package/qt6/qt6tools/Config.in.host

@@ -2,9 +2,6 @@ config BR2_PACKAGE_HOST_QT6TOOLS
 	bool "host qt6tools"
 	# The Qt Qt Network module is required
 	select BR2_PACKAGE_HOST_QT6BASE_NETWORK
-	# Requires the Qt Sql module to build the qhelpgenerator
-	# tool, if target support for Sql is present
-	select BR2_PACKAGE_HOST_QT6BASE_SQL if BR2_PACKAGE_QT6BASE_SQL
 	help
 	  Qt is a cross-platform application and UI framework for
 	  developers using C++.

package/qt6/qt6tools/qt6tools.mk

@@ -28,6 +28,9 @@ QT6TOOLS_LICENSE_FILES = \
 	LICENSES/Qt-GPL-exception-1.0.txt
 
 QT6TOOLS_CONF_OPTS = \
+	-DFEATURE_assistant=OFF \
+	-DFEATURE_designer=OFF \
+	-DFEATURE_linguist=OFF \
 	-DQT_HOST_PATH=$(HOST_DIR) \
 	-DBUILD_WITH_PCH=OFF \
 	-DQT_BUILD_EXAMPLES=OFF \
@@ -42,6 +45,8 @@ QT6TOOLS_DEPENDENCIES += qt6declarative
 endif
 
 HOST_QT6TOOLS_CONF_OPTS = \
+	-DFEATURE_assistant=OFF \
+	-DFEATURE_designer=OFF \
 	-DQT_BUILD_EXAMPLES=OFF \
 	-DQT_BUILD_TESTS=OFF