关于QT程序交叉编译的环境问题

[RC1844]

最近抽时间尝试了交叉编译 QT 程序，发现了 lua 配置脚本的一些问题。

我仅测试了手上有的一款开发板。

首先是 mkspecsdir 似乎不通用，无法命中 px30Sdk 中的 mkspecs 文件夹，

然后我观察了几个平台(win/linux Q5/6)的”Qmake -query“输出,

# px30 sdk: qmake -query
QT_SYSROOT:/home/android-build/linux/px30/PX30_LINUX_SDK_V0.1/px30/buildroot/output/rockchip_px30_64/host/aarch64-buildroot-linux-gnu/sysroot
QT_INSTALL_PREFIX:/home/android-build/linux/px30/PX30_LINUX_SDK_V0.1/px30/buildroot/output/rockchip_px30_64/host/aarch64-buildroot-linux-gnu/sysroot/home/android-build/linux/px30/PX30_LINUX_SDK_V0.1/px30/buildroot/output/rockchip_px30_64/host
QT_INSTALL_PREFIX/raw:/home/android-build/linux/px30/PX30_LINUX_SDK_V0.1/px30/buildroot/output/rockchip_px30_64/host
QT_INSTALL_ARCHDATA:/home/android-build/linux/px30/PX30_LINUX_SDK_V0.1/px30/buildroot/output/rockchip_px30_64/host/aarch64-buildroot-linux-gnu/sysroot/usr
QT_INSTALL_ARCHDATA/raw:/usr
QT_INSTALL_DATA:/home/android-build/linux/px30/PX30_LINUX_SDK_V0.1/px30/buildroot/output/rockchip_px30_64/host/aarch64-buildroot-linux-gnu/sysroot/usr
QT_INSTALL_DATA/raw:/usr
QT_INSTALL_DOCS:/home/android-build/linux/px30/PX30_LINUX_SDK_V0.1/px30/buildroot/output/rockchip_px30_64/host/aarch64-buildroot-linux-gnu/sysroot/usr/doc
QT_INSTALL_DOCS/raw:/usr/doc
QT_INSTALL_HEADERS:/home/android-build/linux/px30/PX30_LINUX_SDK_V0.1/px30/buildroot/output/rockchip_px30_64/host/aarch64-buildroot-linux-gnu/sysroot/usr/include/qt5
QT_INSTALL_HEADERS/raw:/usr/include/qt5
QT_INSTALL_LIBS:/home/android-build/linux/px30/PX30_LINUX_SDK_V0.1/px30/buildroot/output/rockchip_px30_64/host/aarch64-buildroot-linux-gnu/sysroot/usr/lib
QT_INSTALL_LIBS/raw:/usr/lib
QT_INSTALL_LIBEXECS:/home/android-build/linux/px30/PX30_LINUX_SDK_V0.1/px30/buildroot/output/rockchip_px30_64/host/aarch64-buildroot-linux-gnu/sysroot/usr/libexec
QT_INSTALL_LIBEXECS/raw:/usr/libexec
QT_INSTALL_BINS:/home/android-build/linux/px30/PX30_LINUX_SDK_V0.1/px30/buildroot/output/rockchip_px30_64/host/aarch64-buildroot-linux-gnu/sysroot/usr/bin
QT_INSTALL_BINS/raw:/usr/bin
QT_INSTALL_TESTS:/home/android-build/linux/px30/PX30_LINUX_SDK_V0.1/px30/buildroot/output/rockchip_px30_64/host/aarch64-buildroot-linux-gnu/sysroot/usr/tests
QT_INSTALL_TESTS/raw:/usr/tests
QT_INSTALL_PLUGINS:/home/android-build/linux/px30/PX30_LINUX_SDK_V0.1/px30/buildroot/output/rockchip_px30_64/host/aarch64-buildroot-linux-gnu/sysroot/usr/lib/qt/plugins
QT_INSTALL_PLUGINS/raw:/usr/lib/qt/plugins
QT_INSTALL_IMPORTS:/home/android-build/linux/px30/PX30_LINUX_SDK_V0.1/px30/buildroot/output/rockchip_px30_64/host/aarch64-buildroot-linux-gnu/sysroot/usr/imports
QT_INSTALL_IMPORTS/raw:/usr/imports
QT_INSTALL_QML:/home/android-build/linux/px30/PX30_LINUX_SDK_V0.1/px30/buildroot/output/rockchip_px30_64/host/aarch64-buildroot-linux-gnu/sysroot/usr/qml
QT_INSTALL_QML/raw:/usr/qml
QT_INSTALL_TRANSLATIONS:/home/android-build/linux/px30/PX30_LINUX_SDK_V0.1/px30/buildroot/output/rockchip_px30_64/host/aarch64-buildroot-linux-gnu/sysroot/usr/translations
QT_INSTALL_TRANSLATIONS/raw:/usr/translations
QT_INSTALL_CONFIGURATION:/home/android-build/linux/px30/PX30_LINUX_SDK_V0.1/px30/buildroot/output/rockchip_px30_64/host/aarch64-buildroot-linux-gnu/sysroot/usr
QT_INSTALL_CONFIGURATION/raw:/usr
QT_INSTALL_EXAMPLES:/home/android-build/linux/px30/PX30_LINUX_SDK_V0.1/px30/buildroot/output/rockchip_px30_64/host/aarch64-buildroot-linux-gnu/sysroot/usr/lib/qt/examples
QT_INSTALL_EXAMPLES/raw:/usr/lib/qt/examples
QT_INSTALL_DEMOS:/home/android-build/linux/px30/PX30_LINUX_SDK_V0.1/px30/buildroot/output/rockchip_px30_64/host/aarch64-buildroot-linux-gnu/sysroot/usr/lib/qt/examples
QT_INSTALL_DEMOS/raw:/usr/lib/qt/examples
QT_HOST_PREFIX:/home/android-build/linux/px30/PX30_LINUX_SDK_V0.1/px30/buildroot/output/rockchip_px30_64/host
QT_HOST_DATA:/home/android-build/linux/px30/PX30_LINUX_SDK_V0.1/px30/buildroot/output/rockchip_px30_64/host
QT_HOST_BINS:/home/android-build/linux/px30/PX30_LINUX_SDK_V0.1/px30/buildroot/output/rockchip_px30_64/host/bin
QT_HOST_LIBS:/home/android-build/linux/px30/PX30_LINUX_SDK_V0.1/px30/buildroot/output/rockchip_px30_64/host/lib
QMAKE_SPEC:linux-g++
QMAKE_XSPEC:devices/linux-buildroot-g++
QMAKE_VERSION:3.1
QT_VERSION:5.9.4

# linux qt5: qmake -query
QT_SYSROOT:
QT_INSTALL_PREFIX:/usr
QT_INSTALL_ARCHDATA:/usr/lib/qt
QT_INSTALL_DATA:/usr/share/qt
QT_INSTALL_DOCS:/usr/share/doc/qt
QT_INSTALL_HEADERS:/usr/include/qt
QT_INSTALL_LIBS:/usr/lib
QT_INSTALL_LIBEXECS:/usr/lib/qt/libexec
QT_INSTALL_BINS:/usr/bin
QT_INSTALL_TESTS:/usr/tests
QT_INSTALL_PLUGINS:/usr/lib/qt/plugins
QT_INSTALL_IMPORTS:/usr/lib/qt/imports
QT_INSTALL_QML:/usr/lib/qt/qml
QT_INSTALL_TRANSLATIONS:/usr/share/qt/translations
QT_INSTALL_CONFIGURATION:/etc/xdg
QT_INSTALL_EXAMPLES:/usr/share/doc/qt/examples
QT_INSTALL_DEMOS:/usr/share/doc/qt/examples
QT_HOST_PREFIX:/usr
QT_HOST_DATA:/usr/lib/qt
QT_HOST_BINS:/usr/bin
QT_HOST_LIBS:/usr/lib
QMAKE_SPEC:linux-g++
QMAKE_XSPEC:linux-g++
QMAKE_VERSION:3.1
QT_VERSION:5.15.18

# linux qt6: qmake -query
QT_SYSROOT:
QT_INSTALL_PREFIX:/usr
QT_INSTALL_ARCHDATA:/usr/lib/qt6
QT_INSTALL_DATA:/usr/share/qt6
QT_INSTALL_DOCS:/usr/share/doc/qt6
QT_INSTALL_HEADERS:/usr/include/qt6
QT_INSTALL_LIBS:/usr/lib
QT_INSTALL_LIBEXECS:/usr/lib/qt6
QT_INSTALL_BINS:/usr/lib/qt6/bin
QT_INSTALL_TESTS:/usr/tests
QT_INSTALL_PLUGINS:/usr/lib/qt6/plugins
QT_INSTALL_QML:/usr/lib/qt6/qml
QT_INSTALL_TRANSLATIONS:/usr/share/qt6/translations
QT_INSTALL_CONFIGURATION:
QT_INSTALL_EXAMPLES:/usr/share/doc/qt6/examples
QT_INSTALL_DEMOS:/usr/share/doc/qt6/examples
QT_HOST_PREFIX:/usr
QT_HOST_DATA:/usr/lib/qt6
QT_HOST_BINS:/usr/lib/qt6/bin
QT_HOST_LIBEXECS:/usr/lib/qt6
QT_HOST_LIBS:/usr/lib
QMAKE_SPEC:linux-g++
QMAKE_XSPEC:linux-g++
QMAKE_VERSION:3.1
QT_VERSION:6.10.1

# win qt6: qmake -query
QT_SYSROOT:
QT_INSTALL_PREFIX:D:/Qt/6.8.3/msvc2022_64
QT_INSTALL_ARCHDATA:D:/Qt/6.8.3/msvc2022_64
QT_INSTALL_DATA:D:/Qt/6.8.3/msvc2022_64
QT_INSTALL_DOCS:D:/Qt/Docs/Qt-6.8.3
QT_INSTALL_HEADERS:D:/Qt/6.8.3/msvc2022_64/include
QT_INSTALL_LIBS:D:/Qt/6.8.3/msvc2022_64/lib
QT_INSTALL_LIBEXECS:D:/Qt/6.8.3/msvc2022_64/bin
QT_INSTALL_BINS:D:/Qt/6.8.3/msvc2022_64/bin
QT_INSTALL_TESTS:D:/Qt/6.8.3/msvc2022_64/tests
QT_INSTALL_PLUGINS:D:/Qt/6.8.3/msvc2022_64/plugins
QT_INSTALL_QML:D:/Qt/6.8.3/msvc2022_64/qml
QT_INSTALL_TRANSLATIONS:D:/Qt/6.8.3/msvc2022_64/translations
QT_INSTALL_CONFIGURATION:
QT_INSTALL_EXAMPLES:D:/Qt/Examples/Qt-6.8.3
QT_INSTALL_DEMOS:D:/Qt/Examples/Qt-6.8.3
QT_HOST_PREFIX:D:/Qt/6.8.3/msvc2022_64
QT_HOST_DATA:D:/Qt/6.8.3/msvc2022_64
QT_HOST_BINS:D:/Qt/6.8.3/msvc2022_64/bin
QT_HOST_LIBEXECS:D:/Qt/6.8.3/msvc2022_64/bin
QT_HOST_LIBS:D:/Qt/6.8.3/msvc2022_64/lib
QMAKE_SPEC:win32-msvc
QMAKE_XSPEC:win32-msvc
QMAKE_VERSION:3.1
QT_VERSION:6.8.3

发现用“QT_HOST_DATA”，才能完全命中我测试的几个平台。
后来，我又翻阅了 QT 的源码，确定“QT_HOST_DATA”才是正确的路径
https://github.com/qt/qtbase/blob/73a1e8c60d894701f34806cc4b847aa2814bf389/qtbase.pro#L189
https://github.com/qt/qtbase/blob/73a1e8c60d894701f34806cc4b847aa2814bf389/qmake/library/qmakeevaluator.cpp#L1420-L1441

local mkspecsdir = qtenvs.QMAKE_MKSPECS or path.join(qtenvs.QT_HOST_DATA, "mkspecs")

再者就是 mkspec，lua 配置脚本里完全是根据平台写死的，其实用“QMAKE_XSPEC”会好一些

local mkspec = qtenvs.QMAKE_XSPEC or qtenvs.QMAKE_SPEC

然后就是"QT_SYSROOT",我不知道到底要不要添加到 target 的各个 flags 里，我目前是在 toolchains 中添加，可以正确编译，但是不知道是不是正确的做法

问点题外的，package::add_configs 接口能否指定某个配置不需要加入到 manifest.txt 中，不参与配置检查，比如我添加了一个配置，但是这个配置是不会影响最终二进制产物的，所以不需要添加到 manifest.txt 中

[waruqi]

可以提个 pr 过来

问点题外的，package::add_configs 接口能否指定某个配置不需要加入到 manifest.txt 中，不参与配置检查，比如我添加了一个配置，但是这个配置是不会影响最终二进制产物的，所以不需要添加到 manifest.txt 中

不支持

[RC1844]

请审查#7208