作者：Yuan Jianpeng 邮箱：yuanjp89@163.com

发布时间：2025-6-6 站点：Inside Linux Development

本文不完全记录，移植qt 6.4.3到rk3562 soc的过程。

首先需要移植libdrm和libmali。用来支持gpu加速。

编译后，libdrm和libmali分别位于：

/home/yuanjp/proj/zynqmp/staging/rk3562/app/libdrm/usr/lib/pkgconfig

/home/yuanjp/proj/zynqmp/staging/rk3562/app/libmali/usr/lib/pkgconfig

后面会发现，根本原因是这两个库不是同一个目录。qt6的配置程序不支持。

qt6主要是卡在配置阶段，检测egl，opengl失败的问题上。

交叉编译toolchain.mk如下：

$ cat toolchain.cmake 
cmake_minimum_required(VERSION 3.15)
include_guard(GLOBAL)

set(CMAKE_SYSTEM_NAME Linux)
set(CMAKE_SYSTEM_PROCESSOR arm)

set(ENV{PKG_CONFIG_PATH} "")
set(ENV{PKG_CONFIG_LIBDIR} "/home/yuanjp/proj/zynqmp/staging/rk3562/app/libdrm/usr/lib/pkgconfig:/home/yuanjp/proj/zynqmp/staging/rk3562/app/libmali/usr/lib/pkgconfig")

set(CMAKE_C_COMPILER /home/yuanjp/toolchain/toolchain-rk3562/bin/aarch64-none-linux-gnu-gcc)
set(CMAKE_CXX_COMPILER /home/yuanjp/toolchain/toolchain-rk3562/bin/aarch64-none-linux-gnu-g++)

set(CMAKE_SYSROOT /home/yuanjp/toolchain/toolchain-rk3562/aarch64-none-linux-gnu/libc)

set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)

注意：

1 需要指定CMAKE_SYSROOT，否则configure会检测到host的程序。

2 PKG_CONFIG_LIBDIR指定，libdrm和libmali的.pc搜索路径。

PKG_CONFIG=$(HOST)/scripts/pkg-config $(SDIR)/configure \
        -verbose \
        -prefix /opt/qt6 \
        -extprefix $(STAGING) \
        -opensource \
        -confirm-license \
        -release \
        -shared \
        -nomake examples \
        -nomake tests \
        -no-dbus \
        -no-xcb \
        -skip qtwebengine \
        -skip qtwayland \
        -no-openssl \
        -no-cups \
        -opengles3 \
        -egl \
        -gbm \
        -- \
        -DQT_HOST_PATH=$(qt_host_install) \
        -DCMAKE_TOOLCHAIN_FILE=$(ODIR)/toolchain.cmake

configure失败了。

ERROR: Feature "opengles3": Forcing to "ON" breaks its condition:
    QT_FEATURE_opengles2 AND TEST_opengles3
Condition values dump:
    QT_FEATURE_opengles2 = "OFF"
    TEST_opengles3 = "FALSE"

ERROR: Feature "egl": Forcing to "ON" breaks its condition:
    ( QT_FEATURE_opengl OR QT_FEATURE_openvg ) AND EGL_FOUND AND ( QT_FEATURE_dlopen OR NOT UNIX OR INTEGRITY )
Condition values dump:
    QT_FEATURE_opengl = "OFF"
    QT_FEATURE_openvg = "OFF"
    EGL_FOUND = "FALSE"
    QT_FEATURE_dlopen = "ON"
    UNIX = "1"
    INTEGRITY = "0"

ERROR: Feature "gbm": Forcing to "ON" breaks its condition:
    gbm_FOUND
Condition values dump:
    gbm_FOUND = "FALSE"

查看：./CMakeFiles/CMakeConfigureLog.yaml

3357         [1/2] /home/yuanjp/toolchain/toolchain-rk3562/bin/aarch64-none-linux-gnu-g++ --sysroot=/home/yuanjp/toolchain/toolchain-rk3562/aarch64-none-linux-gnu/libc -DHAVE_EGL  -std=gnu++17 -fPIE -o CMakeFiles/cmTC_75fbf.dir/src.cxx.o -c /home/yuanjp/proj/zynqmp/staging     /rk3562/app/qt-everywhere-src-6.4.3/CMakeFiles/CMakeScratch/TryCompile-KJPgPU/src.cxx
3358         FAILED: CMakeFiles/cmTC_75fbf.dir/src.cxx.o 
3359         /home/yuanjp/toolchain/toolchain-rk3562/bin/aarch64-none-linux-gnu-g++ --sysroot=/home/yuanjp/toolchain/toolchain-rk3562/aarch64-none-linux-gnu/libc -DHAVE_EGL  -std=gnu++17 -fPIE -o CMakeFiles/cmTC_75fbf.dir/src.cxx.o -c /home/yuanjp/proj/zynqmp/staging/rk356     2/app/qt-everywhere-src-6.4.3/CMakeFiles/CMakeScratch/TryCompile-KJPgPU/src.cxx
3360         /home/yuanjp/proj/zynqmp/staging/rk3562/app/qt-everywhere-src-6.4.3/CMakeFiles/CMakeScratch/TryCompile-KJPgPU/src.cxx:2:10: fatal error: EGL/egl.h: No such file or directory
3361             2 | #include <EGL/egl.h>
3362               |          ^~~~~~~~~~~
3363         compilation terminated.
3364         ninja: build stopped: subcommand failed.

发现它编译没有使用egl package里面的头文件路径。

修改：

qtbase/cmake/3rdparty/extra-cmake-modules/find-modules/FindEGL.cmake

 75 
 76 message("============== ${PKG_EGL_INCLUDE_DIRS}")
 77 
 78 find_path(EGL_INCLUDE_DIR
 79     NAMES
 80         EGL/egl.h
 81     HINTS
 82         ${PKG_EGL_INCLUDE_DIRS}
 83 )

加上76行，有多个目录，导致了搜索头文件失败了。

============== /home/yuanjp/proj/zynqmp/staging/rk3562/app/libmali-rk3562/staging/usr/include;/home/yuanjp/proj/zynqmp/staging/rk3562/app/libdrm-2.4.120/staging/usr/include;/home/yuanjp/proj/zynqmp/staging/rk3562/app/libdrm-2.4.120/staging/usr/include/libdrm
-- Could NOT find EGL (missing: EGL_INCLUDE_DIR HAVE_EGL EGL_LIBRARY) 

本地调试：

创建一个CMakeLists.txt，如下：

cmake_minimum_required(VERSION 3.30)
project(Test)

message("====CMAKE_C_COMPILER========== ${CMAKE_C_COMPILER}")

include(CMakePushCheckState)
include(CheckCXXSourceCompiles)

find_package(PkgConfig QUIET)
pkg_check_modules(PKG_EGL QUIET egl)

。。。

find_package一下的内容从FindEGL.cmake复制过来。

将之前的toolchain.cmake复制到这边的同一个目录。

执行，复现了问题。

$ cmake -DCMAKE_TOOLCHAIN_FILE=toolchain.cmake ..
-- The C compiler identification is GNU 10.3.1
-- The CXX compiler identification is GNU 10.3.1
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: /home/yuanjp/toolchain/toolchain-rk3562/bin/aarch64-none-linux-gnu-gcc - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: /home/yuanjp/toolchain/toolchain-rk3562/bin/aarch64-none-linux-gnu-g++ - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
====CMAKE_C_COMPILER========== /home/yuanjp/toolchain/toolchain-rk3562/bin/aarch64-none-linux-gnu-gcc
====PKG_EGL_INCLUDE_DIRS========== /home/yuanjp/proj/zynqmp/staging/rk3562/app/libmali-rk3562/staging/usr/include;/home/yuanjp/proj/zynqmp/staging/rk3562/app/libdrm-2.4.120/staging/usr/include;/home/yuanjp/proj/zynqmp/staging/rk3562/app/libdrm-2.4.120/staging/usr/include/libdrm
====PKG_EGL_CFLAGS_OTHER========== 
====PKG_EGL_LIBRARY_DIRS========== /home/yuanjp/proj/zynqmp/staging/rk3562/app/libmali-rk3562/staging/usr/lib;/home/yuanjp/proj/zynqmp/staging/rk3562/app/libdrm-2.4.120/staging/usr/lib
====EGL_LIBRARY========== EGL_LIBRARY-NOTFOUND
====CMAKE_REQUIRED_LIBRARIES========== EGL_LIBRARY-NOTFOUND
====EGL_INCLUDE_DIR========== EGL_INCLUDE_DIR-NOTFOUND
====CMAKE_REQUIRED_INCLUDES========== EGL_INCLUDE_DIR-NOTFOUND
====EGL_DEFINITIONS========== 
====CMAKE_REQUIRED_DEFINITIONS========== 
-- Performing Test HAVE_EGL
-- Performing Test HAVE_EGL - Failed
-- Could NOT find EGL (missing: EGL_INCLUDE_DIR HAVE_EGL EGL_LIBRARY) 
-- Configuring done (0.5s)
-- Generating done (0.0s)
-- Build files have been written to: /home/yuanjp/test/cmake/build

hook pkg-config

toolchain.cmake指定了pkg-config的搜搜目录：PKG_CONFIG_LIBDIR

我们把pkg-config改成我们封装的wrapper脚本。在wrapper脚本里面打印出参数和输出。

PKG_CONFIG=$(HOST)/scripts/pkg-config $(SDIR)/configure

这种方式，就可以改变pkg-config了。应该是cmake是以这个环境变量确定的。

勾出来的内容如下：

========= --print-errors --short-errors --exists egl
========= --modversion egl
7.10
========= --variable=prefix egl
/home/yuanjp/proj/zynqmp/staging/rk3562/app/libmali-rk3562/staging/usr
========= --variable=includedir egl
/home/yuanjp/proj/zynqmp/staging/rk3562/app/libmali-rk3562/staging/usr/include
========= --variable=libdir egl
/home/yuanjp/proj/zynqmp/staging/rk3562/app/libmali-rk3562/staging/usr/lib
========= --libs-only-l egl
-lmali-hook -lmali-hook-injector -lmali -ldrm
========= --static --libs-only-l egl
-lmali-hook -lmali-hook-injector -lmali -ldrm -lm
========= --libs-only-L egl
-L/home/yuanjp/proj/zynqmp/staging/rk3562/app/libmali-rk3562/staging/usr/lib -L/home/yuanjp/proj/zynqmp/staging/rk3562/app/libdrm-2.4.120/staging/usr/lib
========= --static --libs-only-L egl
-L/home/yuanjp/proj/zynqmp/staging/rk3562/app/libmali-rk3562/staging/usr/lib -L/home/yuanjp/proj/zynqmp/staging/rk3562/app/libdrm-2.4.120/staging/usr/lib
========= --libs egl
-L/home/yuanjp/proj/zynqmp/staging/rk3562/app/libmali-rk3562/staging/usr/lib -lmali-hook -Wl,--whole-archive -lmali-hook-injector -Wl,--no-whole-archive -lmali -L/home/yuanjp/proj/zynqmp/staging/rk3562/app/libdrm-2.4.120/staging/usr/lib -ldrm
========= --static --libs egl
-L/home/yuanjp/proj/zynqmp/staging/rk3562/app/libmali-rk3562/staging/usr/lib -lmali-hook -Wl,--whole-archive -lmali-hook-injector -Wl,--no-whole-archive -lmali -L/home/yuanjp/proj/zynqmp/staging/rk3562/app/libdrm-2.4.120/staging/usr/lib -ldrm -lm
========= --libs-only-other egl
-Wl,--whole-archive -Wl,--no-whole-archive
========= --static --libs-only-other egl
-Wl,--whole-archive -Wl,--no-whole-archive
========= --cflags-only-I egl
-I/home/yuanjp/proj/zynqmp/staging/rk3562/app/libmali-rk3562/staging/usr/include -I/home/yuanjp/proj/zynqmp/staging/rk3562/app/libdrm-2.4.120/staging/usr/include -I/home/yuanjp/proj/zynqmp/staging/rk3562/app/libdrm-2.4.120/staging/usr/include/libdrm
========= --static --cflags-only-I egl
-I/home/yuanjp/proj/zynqmp/staging/rk3562/app/libmali-rk3562/staging/usr/include -I/home/yuanjp/proj/zynqmp/staging/rk3562/app/libdrm-2.4.120/staging/usr/include -I/home/yuanjp/proj/zynqmp/staging/rk3562/app/libdrm-2.4.120/staging/usr/include/libdrm
========= --cflags egl
-I/home/yuanjp/proj/zynqmp/staging/rk3562/app/libmali-rk3562/staging/usr/include -I/home/yuanjp/proj/zynqmp/staging/rk3562/app/libdrm-2.4.120/staging/usr/include -I/home/yuanjp/proj/zynqmp/staging/rk3562/app/libdrm-2.4.120/staging/usr/include/libdrm
========= --static --cflags egl
-I/home/yuanjp/proj/zynqmp/staging/rk3562/app/libmali-rk3562/staging/usr/include -I/home/yuanjp/proj/zynqmp/staging/rk3562/app/libdrm-2.4.120/staging/usr/include -I/home/yuanjp/proj/zynqmp/staging/rk3562/app/libdrm-2.4.120/staging/usr/include/libdrm
========= --cflags-only-other egl

========= --static --cflags-only-other egl

而linux主机勾出来的内容如下：

========= --print-errors --short-errors --exists egl
========= --modversion egl
1.5
========= --variable=prefix egl
/usr
========= --variable=includedir egl
/usr/include
========= --variable=libdir egl
/usr/lib64
========= --libs-only-l egl
-lEGL
========= --static --libs-only-l egl
-lEGL
========= --libs-only-L egl
-L/usr/lib64
========= --static --libs-only-L egl
-L/usr/lib64
========= --libs egl
-L/usr/lib64 -lEGL
========= --static --libs egl
-L/usr/lib64 -lEGL
========= --libs-only-other egl

========= --static --libs-only-other egl

========= --cflags-only-I egl
-I/usr/include
========= --static --cflags-only-I egl
-I/usr/include
========= --cflags egl
-I/usr/include
========= --static --cflags egl
-I/usr/include
========= --cflags-only-other egl

========= --static --cflags-only-other egl

PKG_EGL_LIBRARY_DIRS

这个变量，是一个list，有两个目录。导致

find_library(EGL_LIBRARY
    NAMES
        EGL
    HINTS
        ${PKG_EGL_LIBRARY_DIRS}
)
查找失败了。

Final solution

用pkg-config是不靠谱的。直接为每个package单独指定include_dir和library。

然后要链接的库，使用CMAKE_EXE_LINKER_FLAGS。指定link选项了解决编译问题。

在toolchain.cmake里面添加：

set(CMAKE_SYSROOT /home/yuanjp/toolchain/toolchain-rk3562/aarch64-none-linux-gnu/libc)
set(CMAKE_EXE_LINKER_FLAGS "-Wl,-rpath-link=%APPBLD%/libdrm/usr/lib/")

set(Libdrm_INCLUDE_DIR %APPBLD%/libdrm/usr/include)
set(Libdrm_LIBRARY %APPBLD%/libdrm/usr/lib/libdrm.so)

set(EGL_INCLUDE_DIR %APPBLD%/libmali/usr/include)
set(EGL_LIBRARY %APPBLD%/libmali/usr/lib/libmali.so)

set(GLESv2_INCLUDE_DIR %APPBLD%/libmali/usr/include)
set(GLESv2_LIBRARY %APPBLD%/libmali/usr/lib/libmali.so)

set(gbm_INCLUDE_DIR %APPBLD%/libmali/usr/include)
set(gbm_LIBRARY %APPBLD%/libmali/usr/lib/libmali.so)

配置不用-no-pkg-config

        $(H)[ -f $(ODIR)/.configured ] || { cd $(ODIR) && $(Q) $(SDIR)/configure \
                -verbose \
                -prefix /opt/qt6 \
                -extprefix $(STAGING) \
                -no-pkg-config \
                -opensource \
                -confirm-license \
                -release \
                -shared \
                -nomake examples \
                -nomake tests \
                -no-dbus \
                -no-xcb \
                -skip qtwebengine \
                -skip qtwayland \
                -no-openssl \
                -no-cups \
                -opengles3 \
                -egl \
                -gbm \
                -- \
                -DQT_HOST_PATH=$(qt_host_install) \
                -DCMAKE_TOOLCHAIN_FILE=$(ODIR)/toolchain.cmake \
        && touch $(ODIR)/.configured ; }

参考：

https://doc.qt.io/qt-6/configure-linux-device.html

如何使用message进行打印

https://cmake.org/cmake/help/latest/command/message.html

find_path函数：

https://cmake.org/cmake/help/latest/command/find_path.html

 

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