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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.
176 lines
6.5 KiB
Makefile
176 lines
6.5 KiB
Makefile
#
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# Copyright (C) 2015 OpenWrt.org
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# Author: Mirko Vogt <mirko@openwrt.org>
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# This is free software, licensed under the GNU General Public License v2.
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# See /LICENSE for more information.
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#
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# qmake - oh my.. qmake is supposed to generate Makefiles suitable for cross-compiling
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# however fails itself hard being used in a cross compiling toolchain in any sane way.
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#
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# There are the QT_INSTALL_* variables - which get set via Qt's configure options,
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# containing paths which become hardcoded into the qmake binary.
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# Those paths are supposed to refer to the target system, however are also used for
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# include and linker paths.
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# Hence, setting QT_INSTALL_PREFIX=/usr would result in -I/usr/include,
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# -L/usr/lib, etc., referencing the host headers and libraries.
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# The QT_SYSROOT variable looks most promising for distinguishing between
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# host and target specific paths, however it fails hard and is totally undocumented.
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# The extprefix variable tries to cover the situation, however actually just prepends
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# its path to the QT_INSTALL_* variables - basically cosmetics.
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#
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# The QT_HOST_* variables are used for host tools, libraries, mkspecs and its data.
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#
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# As a consequence we set QT_INSTALL_* and QT_HOST_* to absolute paths, which
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# inevitably results in the following issues:
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#
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# - 'make install' results in paths like:
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# /tmp/install_root/home/cross/openwrt/staging_dir/target-*/usr.
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# This is workarounded by overriding the PKG_INSTALL_DIR, so the Makefiles don't
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# have to care about that.
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# - Once compiled, qmake's location and its requirements (mkspecs, etc.) are fixed,
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# since its absolute paths were hardcoded. No moving around of the toolchain.
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# - Those variables might be used for target binaries for some weird reason, so
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# paths to the host staging_dir would make it to the target, logically leading to
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# errors.
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# - Paths might make it into target binaries, thus referencing non-existing
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# objects on the target platform. Tihs behaviour wasn't observed so far, however
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# one might use the QT_INSTALL_* variables for some weird reason during runtime.
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# for target builds (STAGING_DIR)
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QT_EXTPREFIX:=$(STAGING_DIR)/$(CONFIGURE_PREFIX)
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QT_SYSROOT:=
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QT_INSTALL_CONFIGURATION:=/etc/qt5
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QT_INSTALL_PREFIX:=$(CONFIGURE_PREFIX)
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QT_INSTALL_LIBS:=$(QT_INSTALL_PREFIX)/lib
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QT_INSTALL_DATA:=$(QT_INSTALL_PREFIX)/share/qt5
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QT_INSTALL_HEADERS:=$(QT_INSTALL_PREFIX)/include
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QT_INSTALL_BINS:=$(QT_INSTALL_PREFIX)/bin
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QT_INSTALL_DOCS:=$(QT_INSTALL_DATA)/doc
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QT_INSTALL_TRANSLATIONS:=$(QT_INSTALL_DATA)/translations
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QT_INSTALL_ARCHDATA:=$(QT_INSTALL_LIBS)/qt5
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QT_INSTALL_LIBEXECS:=$(QT_INSTALL_ARCHDATA)
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QT_INSTALL_TESTS:=$(QT_INSTALL_ARCHDATA)/tests
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QT_INSTALL_PLUGINS:=$(QT_INSTALL_ARCHDATA)/plugins
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QT_INSTALL_IMPORTS:=$(QT_INSTALL_ARCHDATA)/imports
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QT_INSTALL_QML:=$(QT_INSTALL_ARCHDATA)/qml
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QT_INSTALL_EXAMPLES:=$(QT_INSTALL_ARCHDATA)/examples
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QT_INSTALL_DEMOS:=$(QT_INSTALL_EXAMPLES)
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# for host builds defined in target project files (STAGING_DIR)/host
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QT_HOST_EXTPREFIX:=$(STAGING_DIR)/host
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QT_HOST_PREFIX:=$(QT_HOST_EXTPREFIX)
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QT_HOST_DATA:=$(QT_HOST_PREFIX)/share
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QT_HOST_BINS:=$(QT_HOST_PREFIX)/bin
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QT_HOST_LIBS:=$(QT_HOST_PREFIX)/lib
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QMAKE_SPEC:=linux-g++
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QMAKE_XSPEC:=linux-openwrt-g++
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PKG_INSTALL_DIR_ROOT:=$(PKG_INSTALL_DIR)
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PKG_INSTALL_DIR:=$(PKG_INSTALL_DIR_ROOT)/$(STAGING_DIR)
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# for target independant host builds (STAGING_DIR_HOST)
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HOST_INSTALL_DIR_ROOT:=$(HOST_INSTALL_DIR)
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HOST_INSTALL_DIR:=$(HOST_INSTALL_DIR_ROOT)/$(STAGING_DIR_HOST)
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#HOST_INSTALL_DIR:=$(HOST_INSTALL_DIR_ROOT)/$(STAGING_DIR)
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define Build/Configure/Default
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TARGET_CROSS="$(TARGET_CROSS)" \
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TARGET_CFLAGS="$(TARGET_CPPFLAGS) $(TARGET_CFLAGS)" \
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TARGET_CXXFLAGS="$(TARGET_CPPFLAGS) $(TARGET_CXXFLAGS)" \
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TARGET_LDFLAGS="$(TARGET_LDFLAGS)" \
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qmake \
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-o $(PKG_BUILD_DIR)/$(MAKE_PATH)/Makefile \
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$(PKG_BUILD_DIR)/$(MAKE_PATH)/$(if $(1),$(1).pro,)
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endef
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define Host/Configure/Default
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qmake_host \
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-o $(HOST_BUILD_DIR)/$(MAKE_PATH)/Makefile \
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$(HOST_BUILD_DIR)/$(MAKE_PATH)/$(if $(1),$(1).pro,)
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endef
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# We need to pass all qmake related variables to $(MAKE) as well, as (generated) Makefiles may invoke qmake once again for creating further Makefiles.
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# Actually we'd also like to pass $MAKE_VARS and $MAKE_FLAGS to also make ordinary non-qmake generated Makefiles calling toolchain executables
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# like $CC/$CXX/.. work, however this would interfere with qmake generated Makefiles, since they expect variables being set differently.
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# For example qmake generated Makefiles expect $AR to also contain ar's arguments, while ordinary Makefiles don't.
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# Until we find a way to disginguish both kinds of Makefiles, we will neglect ordinary Makefiles calling toolchain executables.
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# Mixing qmake generated and ordinary Makfiles - both calling toolchain executables - is probably a very rare case anyway.
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define Build/Compile/Default
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+TARGET_CROSS="$(TARGET_CROSS)" \
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TARGET_CFLAGS="$(TARGET_CPPFLAGS) $(TARGET_CFLAGS)" \
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TARGET_CXXFLAGS="$(TARGET_CPPFLAGS) $(TARGET_CXXFLAGS)" \
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TARGET_LDFLAGS="$(TARGET_LDFLAGS)" \
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$(MAKE) $(PKG_JOBS) -C $(PKG_BUILD_DIR)/$(MAKE_PATH) \
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$(1)
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endef
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define Host/Compile/Default
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+TARGET_CFLAGS="$(HOST_CPPFLAGS) $(HOST_CFLAGS)" \
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TARGET_CXXFLAGS="$(HOST_CPPFLAGS) $(HOST_CXXFLAGS)" \
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TARGET_LDFLAGS="$(HOST_LDFLAGS)" \
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$(MAKE) $(PKG_JOBS) -C $(HOST_BUILD_DIR)/$(MAKE_PATH) \
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$(1)
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endef
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define Build/Install/Default
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INSTALL_ROOT="$(PKG_INSTALL_DIR_ROOT)" \
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$(MAKE) -C $(PKG_BUILD_DIR)/$(MAKE_PATH) \
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$(1) install
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endef
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define Host/Install/Default
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INSTALL_ROOT="$(HOST_INSTALL_DIR_ROOT)" \
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$(MAKE) -C $(HOST_BUILD_DIR)/$(MAKE_PATH) \
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$(1) install
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endef
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define Build/Install/HostFiles
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$(INSTALL_DIR) \
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$(1)/host
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$(CP) \
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$(PKG_INSTALL_DIR)/host/* \
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$(1)/host/
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endef
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define Build/Install/Headers
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$(INSTALL_DIR) \
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$(1)/$(QT_INSTALL_HEADERS)
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$(CP) \
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$(PKG_INSTALL_DIR)/$(QT_INSTALL_HEADERS)/* \
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$(1)/$(QT_INSTALL_HEADERS)/
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endef
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define Build/Install/Libs
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$(INSTALL_DIR) \
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$(1)/$(QT_INSTALL_LIBS)
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$(CP) \
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$(PKG_INSTALL_DIR)/$(QT_INSTALL_LIBS)/$(2).so* \
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$(1)/$(QT_INSTALL_LIBS)/
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endef
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define Build/Install/Plugins
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$(INSTALL_DIR) \
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$(1)/$(QT_INSTALL_PLUGINS)/$(2)
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$(CP) \
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$(PKG_INSTALL_DIR)/$(QT_INSTALL_PLUGINS)/$(2)/$(3).so* \
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$(1)/$(QT_INSTALL_PLUGINS)/$(2)/
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endef
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define Build/Install/Examples
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$(INSTALL_DIR) \
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$(1)/$(QT_INSTALL_EXAMPLES)
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$(CP) \
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$(PKG_INSTALL_DIR)/$(QT_INSTALL_EXAMPLES)/* \
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$(1)/$(QT_INSTALL_EXAMPLES)/
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$(FIND) $(1)/$(QT_INSTALL_EXAMPLES) \
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-type f \( -name '*.cpp' -o -name '*.h' -o -name '*.pro' -o -name '*.pri' \) | \
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$(XARGS) $(RM) -vf
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endef
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