[Buildroot] [PATCH] package/qt6/qt6base: Make qmake work

* [Buildroot] [PATCH] package/qt6/qt6base: Make qmake work
@ 2024-04-11 14:55 Ben Hutchings via buildroot
  2024-04-11 14:55 ` [Buildroot] [PATCH] package/qt6/qt6base: Restore DirectFB support Ben Hutchings via buildroot
  2024-09-14 16:16 ` [Buildroot] [PATCH] package/qt6/qt6base: Make qmake work Thomas Petazzoni via buildroot
  0 siblings, 2 replies; 6+ messages in thread
From: Ben Hutchings via buildroot @ 2024-04-11 14:55 UTC (permalink / raw)
  To: buildroot; +Cc: Ben Hutchings

Currently the qt6base package does not install a working qmake
program, so applications can only be built with CMake.

To ease upgrades from Qt 5, make qmake work as well:

- Create a linux-buildroot-g++ device spec, like we do for Qt 5.

- Fix the generated target_qt.conf file.  The Qt build system
  currently generates this with the sysroot directory wrongly added in
  various places.

- Fix the qmake wrapper script in the sysroot to set the QMAKEPATH
  environment variable.

Signed-off-by: Ben Hutchings <ben.hutchings@mind.be>
---
 package/qt6/qt6base/qmake.conf.in     | 34 +++++++++++++++++++++++
 package/qt6/qt6base/qplatformdefs.h   |  1 +
 package/qt6/qt6base/qt6base.mk        | 39 +++++++++++++++++++++++++++
 package/qt6/qt6base/target_qt.conf.in | 11 ++++++++
 4 files changed, 85 insertions(+)
 create mode 100644 package/qt6/qt6base/qmake.conf.in
 create mode 100644 package/qt6/qt6base/qplatformdefs.h
 create mode 100644 package/qt6/qt6base/target_qt.conf.in

diff --git a/package/qt6/qt6base/qmake.conf.in b/package/qt6/qt6base/qmake.conf.in
new file mode 100644
index 0000000000..b62a671c35
--- /dev/null
+++ b/package/qt6/qt6base/qmake.conf.in
@@ -0,0 +1,34 @@
+# Qt6 has a mechanism to support "device" profiles, so that people can
+# specify the compiler, compiler flags and so on for a specific device.
+
+# We leverage this mechanism in the Buildroot packaging of qt6 to
+# simplify cross-compilation: we have our own "device" definition, which
+# allows us to easily pass the cross-compiler paths and flags from our
+# qt6.mk.
+
+CROSS_COMPILE = @CROSS_COMPILE@
+
+include(../common/linux_device_pre.conf)
+
+# modifications to gcc-base.conf
+QMAKE_CFLAGS           += $${BR_COMPILER_CFLAGS}
+QMAKE_CXXFLAGS         += $${BR_COMPILER_CXXFLAGS}
+# Remove all optimisation flags, we really only want our own.
+QMAKE_CFLAGS_OPTIMIZE       =
+QMAKE_CFLAGS_OPTIMIZE_DEBUG =
+QMAKE_CFLAGS_OPTIMIZE_FULL  =
+QMAKE_CFLAGS_OPTIMIZE_SIZE  =
+QMAKE_CFLAGS_DEBUG =
+QMAKE_CXXFLAGS_DEBUG =
+QMAKE_CFLAGS_RELEASE =
+QMAKE_CXXFLAGS_RELEASE =
+CONFIG                 += nostrip
+
+QMAKE_LIBS             += -lrt -lpthread -ldl
+QMAKE_CFLAGS_ISYSTEM   =
+
+# Architecture specific configuration
+include(arch.conf)
+
+include(../common/linux_device_post.conf)
+load(qt_config)
diff --git a/package/qt6/qt6base/qplatformdefs.h b/package/qt6/qt6base/qplatformdefs.h
new file mode 100644
index 0000000000..99e9a27923
--- /dev/null
+++ b/package/qt6/qt6base/qplatformdefs.h
@@ -0,0 +1 @@
+#include "../../linux-g++/qplatformdefs.h"
diff --git a/package/qt6/qt6base/qt6base.mk b/package/qt6/qt6base/qt6base.mk
index 6857725ef5..049d73a84f 100644
--- a/package/qt6/qt6base/qt6base.mk
+++ b/package/qt6/qt6base/qt6base.mk
@@ -78,6 +78,45 @@ QT6BASE_CONF_OPTS += \
 	-DFEATURE_avx512vl=OFF \
 	-DFEATURE_vaes=OFF
 
+ifeq ($(BR2_TOOLCHAIN_HAS_LIBATOMIC),y)
+define QT6BASE_MKSPEC_ARCH_CONFIG
+# Qt 6 needs atomics, which on various architectures are in -latomic
+	printf '!host_build { \n LIBS += -latomic\n }' > \
+		$(STAGING_DIR)/usr/mkspecs/devices/linux-buildroot-g++/arch.conf
+endef
+endif
+
+define QT6BASE_INSTALL_MKSPEC
+	mkdir -p $(STAGING_DIR)/usr/mkspecs/devices/linux-buildroot-g++
+	$(INSTALL) -m 0644 $(QT6BASE_PKGDIR)/qplatformdefs.h \
+		$(STAGING_DIR)/usr/mkspecs/devices/linux-buildroot-g++/
+	sed 's%@CROSS_COMPILE@%$(TARGET_CROSS)%' \
+		< $(QT6BASE_PKGDIR)/qmake.conf.in \
+		> $(STAGING_DIR)/usr/mkspecs/devices/linux-buildroot-g++/qmake.conf
+	touch $(STAGING_DIR)/usr/mkspecs/devices/linux-buildroot-g++/arch.conf
+	$(QT6BASE_MKSPEC_ARCH_CONFIG)
+endef
+
+# The generated broken target_qt.conf is broken, so replace it
+define QT6BASE_INSTALL_TARGET_QT_CONF
+	sed 's%@HOST_DIR@%$(HOST_DIR)%; s%@SYSROOT@%$(STAGING_DIR)%' \
+		< $(QT6BASE_PKGDIR)/target_qt.conf.in \
+		> $(STAGING_DIR)/usr/bin/target_qt.conf
+endef
+
+# The qmake wrapper script doesn't set QMAKEPATH, so qmake doesn't
+# find specs and modules installed for the target
+define QT6BASE_FIX_QMAKE_SCRIPT
+	sed -i '1a\
+export QMAKEPATH=$(STAGING_DIR)/usr' \
+		$(STAGING_DIR)/usr/bin/qmake
+endef
+
+QT6BASE_POST_INSTALL_STAGING_HOOKS += \
+	QT6BASE_INSTALL_MKSPEC \
+	QT6BASE_INSTALL_TARGET_QT_CONF \
+	QT6BASE_FIX_QMAKE_SCRIPT
+
 HOST_QT6BASE_DEPENDENCIES = \
 	host-double-conversion \
 	host-libb2 \
diff --git a/package/qt6/qt6base/target_qt.conf.in b/package/qt6/qt6base/target_qt.conf.in
new file mode 100644
index 0000000000..5702970c47
--- /dev/null
+++ b/package/qt6/qt6base/target_qt.conf.in
@@ -0,0 +1,11 @@
+[Paths]
+Prefix=/usr
+HostPrefix=@HOST_DIR@
+HostBinaries=bin
+HostLibraries=lib
+HostLibraryExecutables=libexec
+HostData=.
+Sysroot=@SYSROOT@
+SysrootifyPrefix=true
+TargetSpec=devices/linux-buildroot-g++
+HostSpec=
-- 
2.39.2

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