package/qt5base: provide "qt.conf" to make "qmake" relocatable

The file "qt.conf" can be used to override the hard-coded paths that
are compiled into the Qt library. This is required to make "qmake"
relocatable. Actually, we need to specify all variables to overwrite
the compiled in values.

CC: Julien Corjon <corjon.j@ecagroup.com>
CC: Peter Seiderer <ps.report@gmx.net>
Signed-off-by: Wolfgang Grandegger <wg@grandegger.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/qt5/qt5base/qt.conf.in

@@ -0,0 +1,19 @@
+[Paths]
+Prefix=@@HOST_DIR@@
+Sysroot=@@STAGING_DIR@@
+Headers=/usr/include/qt5
+Libraries=/usr/lib
+LibraryExecutables=/usr/libexec
+Binaries=/usr/bin
+Plugins=/usr/lib/qt/plugins
+Examples=/usr/lib/qt/examples
+Qml2Imports=/usr/qml
+Imports=/usr/imports
+Translations=/usr/translations
+Examples=/usr/lib/qt/examples
+Demos=/usr/lib/qt/examples
+Tests=/usr/tests
+Settings=/usr
+Documentation=/usr/doc
+ArchData=/usr
+Data=/usr

package/qt5/qt5base/qt5base.mk

@@ -264,9 +264,17 @@ define QT5BASE_BUILD_CMDS
 	$(TARGET_MAKE_ENV) $(MAKE) -C $(@D)
 endef
 
+# The file "qt.conf" can be used to override the hard-coded paths that are
+# compiled into the Qt library. We need it to make "qmake" relocatable.
+define QT5BASE_INSTALL_QT_CONF
+	sed -e "s|@@HOST_DIR@@|$(HOST_DIR)|" -e "s|@@STAGING_DIR@@|$(STAGING_DIR)|" \
+		$(QT5BASE_PKGDIR)/qt.conf.in > $(HOST_DIR)/bin/qt.conf
+endef
+
 define QT5BASE_INSTALL_STAGING_CMDS
 	$(TARGET_MAKE_ENV) $(MAKE) -C $(@D) install
 	$(QT5_LA_PRL_FILES_FIXUP)
+	$(QT5BASE_INSTALL_QT_CONF)
 endef
 
 define QT5BASE_INSTALL_TARGET_LIBS