qt5base: also build for host

Although Qt has the functionality of <host_build>'s,
it's supposed to be used and explicitly stated in
project files, so it can't be switched on from the
outside (e.g. via flags or env vars).

On top of that all builds using the <host_build>
directive get linked against libQtBootstrap.a which
is not always desired.

libQtBootstrap.a is also the only file available for
host builds, which means, <host_build>'s can't just make
use of and and link against e.g. libQtCore, as those
objects only get compiled for the target, not for the
host.

Because of above reasons, we build Qt twice now, once
for the host, once for the target.

frameworks/qt5base/Makefile

@@ -21,12 +21,15 @@ PKG_SOURCE:=$(PKG_SYS_NAME).tar.xz
 PKG_SOURCE_URL:=http://download.qt-project.org/official_releases/qt/$(basename $(PKG_VERSION))/$(PKG_VERSION)/submodules
 
 PKG_BUILD_DIR=$(BUILD_DIR)/$(PKG_SYS_NAME)
+HOST_BUILD_DIR=$(BUILD_DIR)/host/$(PKG_SYS_NAME)
 PKG_BUILD_PARALLEL:=1
+HOST_BUILD_PARALLEL:=1
 PKG_BUILD_DEPENDS:=librpc
 PKG_INSTALL:=1
 PKG_USE_MIPS16:=0
 
 include $(INCLUDE_DIR)/package.mk
+include $(INCLUDE_DIR)/host-build.mk
 include $(INCLUDE_DIR)/nls.mk
 include ./files/qmake.mk
 
@@ -283,6 +286,7 @@ define Build/Configure
 			-prefix $(QT_INSTALL_PREFIX) \
 			-extprefix $(QT_EXTPREFIX) \
 			-hostprefix $(QT_HOST_PREFIX) \
+			-hostdatadir $(QT_HOST_PREFIX)/share \
 			-no-gcc-sysroot \
 			-bindir $(QT_INSTALL_BINS) \
 			-headerdir $(QT_INSTALL_HEADERS) \
@@ -390,6 +394,89 @@ define Build/Configure
 	)
 endef
 
+
+define Host/Configure
+	# CROSS/TARGET_* need to be passed to configure, in order to use cross-compiling tools to check for requirements.
+	# Usually used variables such as CC/CXX/CFLAGS/CXXFLAGS/LDFLAGS would be used for compilation of host tools (qmake, moc, etc.),
+	# hence we use the TARGET_* nomenclature.
+	( cd $(HOST_BUILD_DIR) ; \
+		TARGET_CFLAGS="$(HOST_CFLAGS)" \
+		TARGET_CXXFLAGS="$(HOST_CFLAGS) $(HOST_CXXFLAGS)" \
+		TARGET_LDFLAGS="$(HOST_LDFLAGS)" \
+		./configure \
+			-prefix $(STAGING_DIR_HOST) \
+			-hostprefix $(STAGING_DIR_HOST) \
+			-hostdatadir $(STAGING_DIR_HOST)/share \
+			-datadir $(STAGING_DIR_HOST)/share \
+			-archdatadir $(STAGING_DIR_HOST)/lib \
+			-no-gcc-sysroot \
+			-verbose \
+			-opensource \
+			-confirm-license \
+			-release \
+			-no-optimized-tools \
+			-no-strip \
+			-shared \
+			-no-framework \
+			-nomake tools \
+			-nomake examples \
+			-no-compile-examples \
+			-gui \
+			-no-widgets \
+			-no-dbus \
+			-no-accessibility \
+			-no-qml-debug \
+			-qt-doubleconversion \
+			-no-glib \
+			-no-eventfd \
+			-no-inotify \
+			-no-icu \
+			-qt-pcre \
+			-qt-zlib \
+			-no-journald \
+			-no-syslog \
+			-no-ssl \
+			-no-openssl \
+			-no-cups \
+			-no-fontconfig \
+			-qt-freetype \
+			-no-harfbuzz \
+			-no-gtk \
+			-no-opengl \
+			-no-xcb-xlib \
+			-no-xcb \
+			-no-directfb \
+			-no-eglfs \
+			-no-gbm \
+			-no-kms \
+			-no-linuxfb \
+			-no-mirclient \
+			-no-xcb \
+			-evdev \
+			-no-libinput \
+			-no-mtdev \
+			-no-tslib \
+			-no-xinput2 \
+			-no-xkbcommon-x11 \
+			-no-xkbcommon-evdev \
+			-no-gif \
+			-no-ico \
+			-qt-libpng \
+			-no-libjpeg \
+			-no-sql-db2 \
+			-no-sql-ibase \
+			-no-sql-mysql \
+			-no-sql-oci \
+			-no-sql-odbc \
+			-no-sql-psql \
+			-no-sql-sqlite \
+			-no-sql-sqlite2 \
+			-no-sql-tds \
+			-no-libproxy \
+			-no-xkbcommon \
+	)
+endef
+
 define Build/InstallDev
 	$(INSTALL_DIR) \
 		$(STAGING_DIR)/host/mk
@@ -403,6 +490,32 @@ define Build/InstallDev
 	$(call Build/Install/Libs,$(1),*)
 endef
 
+define Host/Install
+	$(call Host/Install/Default)
+
+	$(INSTALL_DIR) \
+	  $(STAGING_DIR_HOST)/bin \
+	  $(STAGING_DIR_HOST)/lib \
+	  $(STAGING_DIR_HOST)/include \
+	  $(STAGING_DIR_HOST)/share
+
+	$(CP) \
+	  $(HOST_INSTALL_DIR)/lib/* \
+	  $(STAGING_DIR_HOST)/lib/
+
+	$(CP) \
+	  $(HOST_INSTALL_DIR)/include/* \
+	  $(STAGING_DIR_HOST)/include/
+
+	$(CP) \
+	  $(HOST_INSTALL_DIR)/share/* \
+	  $(STAGING_DIR_HOST)/share/
+
+	$(CP) \
+	  $(HOST_INSTALL_DIR)/bin/qmake \
+	  $(STAGING_DIR_HOST)/bin/qmake_host
+endef
+
 define Package/qt5base-concurrent/install
 	$(call Build/Install/Libs,$(1),libQt5Concurrent)
 endef
@@ -534,3 +647,4 @@ $(eval $(call BuildPackage,qt5base-plugin-platforms-offscreen))
 $(eval $(call BuildPackage,qt5base-plugin-platforms-vnc))
 #$(eval $(call BuildPackage,qt5base-plugin-sqldrivers-sqlite))
 $(eval $(call BuildPackage,qt5base-examples))
+$(eval $(call HostBuild))

frameworks/qt5base/files/qmake.mk

@@ -37,7 +37,7 @@
 #    objects on the target platform. Tihs behaviour wasn't observed so far, however 
 #    one might use the QT_INSTALL_* variables for some weird reason during runtime.
 
-
+# for target builds (STAGING_DIR)
 QT_EXTPREFIX:=$(STAGING_DIR)/$(CONFIGURE_PREFIX)
 QT_SYSROOT:=
 QT_INSTALL_CONFIGURATION:=/etc/qt5
@@ -56,6 +56,7 @@ QT_INSTALL_IMPORTS:=$(QT_INSTALL_ARCHDATA)/imports
 QT_INSTALL_QML:=$(QT_INSTALL_ARCHDATA)/qml
 QT_INSTALL_EXAMPLES:=$(QT_INSTALL_ARCHDATA)/examples
 QT_INSTALL_DEMOS:=$(QT_INSTALL_EXAMPLES)
+# for host builds defined in target project files (STAGING_DIR)/host
 QT_HOST_EXTPREFIX:=$(STAGING_DIR)/host
 QT_HOST_PREFIX:=$(QT_HOST_EXTPREFIX)
 QT_HOST_DATA:=$(QT_HOST_PREFIX)/share
@@ -68,6 +69,11 @@ QMAKE_XSPEC:=linux-openwrt-g++
 PKG_INSTALL_DIR_ROOT:=$(PKG_INSTALL_DIR)
 PKG_INSTALL_DIR:=$(PKG_INSTALL_DIR_ROOT)/$(STAGING_DIR)
 
+# for target independant host builds (STAGING_DIR_HOST)
+HOST_INSTALL_DIR_ROOT:=$(HOST_INSTALL_DIR)
+HOST_INSTALL_DIR:=$(HOST_INSTALL_DIR_ROOT)/$(STAGING_DIR_HOST)
+#HOST_INSTALL_DIR:=$(HOST_INSTALL_DIR_ROOT)/$(STAGING_DIR)
+
 define Build/Configure/Default
 	TARGET_CROSS="$(TARGET_CROSS)" \
 	TARGET_CFLAGS="$(TARGET_CPPFLAGS) $(TARGET_CFLAGS)" \
@@ -78,6 +84,12 @@ define Build/Configure/Default
 		$(PKG_BUILD_DIR)/$(MAKE_PATH)/$(if $(1),$(1).pro,)
 endef
 
+define Host/Configure/Default
+	qmake_host \
+		-o $(HOST_BUILD_DIR)/$(MAKE_PATH)/Makefile \
+		$(HOST_BUILD_DIR)/$(MAKE_PATH)/$(if $(1),$(1).pro,)
+endef
+
 # We need to pass all qmake related variables to $(MAKE) as well, as (generated) Makefiles may invoke qmake once again for creating further Makefiles.
 # Actually we'd also like to pass $MAKE_VARS and $MAKE_FLAGS to also make ordinary non-qmake generated Makefiles calling toolchain executables
 # like $CC/$CXX/.. work, however this would interfere with qmake generated Makefiles, since they expect variables being set differently.
@@ -93,12 +105,26 @@ define Build/Compile/Default
 			$(1)
 endef
 
+define Host/Compile/Default
+	+TARGET_CFLAGS="$(HOST_CPPFLAGS) $(HOST_CFLAGS)" \
+	TARGET_CXXFLAGS="$(HOST_CPPFLAGS) $(HOST_CXXFLAGS)" \
+	TARGET_LDFLAGS="$(HOST_LDFLAGS)" \
+		$(MAKE) $(PKG_JOBS) -C $(HOST_BUILD_DIR)/$(MAKE_PATH) \
+			$(1)
+endef
+
 define Build/Install/Default
 	INSTALL_ROOT="$(PKG_INSTALL_DIR_ROOT)" \
 		$(MAKE) -C $(PKG_BUILD_DIR)/$(MAKE_PATH) \
 			$(1) install
 endef
 
+define Host/Install/Default
+	INSTALL_ROOT="$(HOST_INSTALL_DIR_ROOT)" \
+		$(MAKE) -C $(HOST_BUILD_DIR)/$(MAKE_PATH) \
+			$(1) install
+endef
+
 define Build/Install/HostFiles
 	$(INSTALL_DIR) \
 		$(1)/host