树莓派的Qt交叉编译:找不到GLESv2 [英] qt cross compilation for raspberry pi: Cannot find GLESv2
问题描述
我正在尝试为我的raspberry pi 3计算模块编译<c0>,并且我主要关注此处的在线指南(
I am trying to compile qt 5.9
for my raspberry pi 3 compute module and I have been following mainly the online guide here (https://wiki.qt.io/RaspberryPi2EGLFS). So, I have set the pi system roots to the mount point /mnt/pi-rootfs
. I have also set the symlinks to be relative using the script sysroot-relativelinks.py
.
使用以下参数调用qtbase配置:
The qtbase configuration was called with the following argument:
./configure -opengl es2 -device linux-rpi3-g++ -device-option
CROSS_COMPILE=/home/osboxes/Downloads/gcc-linaro-6.3.1-2017.05-x86_64_arm-linux-gnueabihf/bin/arm-linux-gnueabihf-
-sysroot /mnt/pi-rootfs -opensource -confirm-license -optimized-qmake
-reduce-exports -release -make libs -prefix /usr/local/qt5pi
-hostprefix /usr/local/qt5pi
这将配置qt但没有openGL,并且我收到消息:
This configures qt but no openGL and I have the message:
ERROR: Feature 'opengles2' was enabled, but the pre-condition 'config.win32 || (!config.watchos && !features.opengl-desktop && libs.opengl_es2)' failed.
ERROR: The OpenGL functionality tests failed!
You might need to modify the include and library search paths by editing QMAKE_INCDIR_OPENGL[_ES2],
QMAKE_LIBDIR_OPENGL[_ES2] and QMAKE_LIBS_OPENGL[_ES2] in the mkspec for your platform.
Check config.log for details.
查看配置文件,我有:
> /home/osboxes/Downloads/gcc-linaro-6.3.1-2017.05-x86_64_arm-linux-gnueabihf/bin/arm-linux-gnueabihf-g++ -c -march=armv8-a -mtune=cortex-a53 -mfpu=crypto-neon-fp-armv8 -mfloat-abi=hard --sysroot=/mnt/pi-rootfs --sysroot=/mnt/pi-rootfs -O2 -Wall -W -fPIC -I. -I/opt/vc/include -I/opt/vc/include/interface/vcos/pthreads -I/opt/vc/include/interface/vmcs_host/linux -I/home/osboxes/Downloads/qt5/qtbase/mkspecs/devices/linux-rpi3-g++ -o opengles2.o opengles2.cpp
> opengles2.cpp:44:25: fatal error: GLES2/gl2.h: No such file or directory
> #include <GLES2/gl2.h>
> ^
> compilation terminated.
> Makefile:179: recipe for target 'opengles2.o' failed
> make: *** [opengles2.o] Error 1
=> source failed verification.
test config.gui.libraries.opengl_es2 FAILED
因此,它无法正确设置路径,因此我为linux-rpi3-g++
编辑了mkspecs
文件.因此,文件的相关部分如下所示:
So, it does not set the paths correctly, so I edited the mkspecs
file for linux-rpi3-g++
. So, the relevant part of the file looks like:
QMAKE_LFLAGS += -Wl,-rpath-link,$$[QT_SYSROOT]/opt/vc/lib
VC_LIBRARY_PATH = /opt/vc/lib
VC_INCLUDE_PATH = /opt/vc/include
# terrible, they do not appear to resolve "=" in rpath!
VC_LINK_LINE = -L=$${VC_LIBRARY_PATH} -Wl,-rpath-link,$$[QT_SYSROOT]$${VC_LIBRARY_PATH}
QMAKE_LIBDIR_OPENGL_ES2 = =$${VC_LIBRARY_PATH}
QMAKE_LIBDIR_EGL = $$QMAKE_LIBDIR_OPENGL_ES2
QMAKE_LIBDIR_OPENVG = $$QMAKE_LIBDIR_OPENGL_ES2
QMAKE_INCDIR_EGL = \
$${VC_INCLUDE_PATH} \
$${VC_INCLUDE_PATH}/interface/vcos/pthreads \
$${VC_INCLUDE_PATH}/interface/vmcs_host/linux
QMAKE_INCDIR_OPENGL_ES2 = $${QMAKE_INCDIR_EGL}
QMAKE_LIBS_OPENGL_ES2 = $${VC_LINK_LINE} -lGLESv2
# The official opt vc EGL references GLESv2 symbols: need to link it
QMAKE_LIBS_EGL = $${VC_LINK_LINE} -lEGL -lGLESv2
因此,我尝试了各种方法,包括在不同的位置添加$$[QT_SYSROOT]
前缀,例如在VC_LIBRARY_PATH
和VC_INCLUDE_PATH
,即使我找到了它不喜欢的GLES2库包含路径(我已验证这些库确实位于正确的位置:/mnt/pi-rootfs/opt/vc/lib
).
So, I tried various things which all included adding $$[QT_SYSROOT]
prefix at various places for example at VC_LIBRARY_PATH
and VC_INCLUDE_PATH
and even though I got it to find the include path it could not like to the GLES2 libraries (I have verified the libs are indeed at the correct location: /mnt/pi-rootfs/opt/vc/lib
).
我想知道是否有人希望在不编辑qt mkspecs文件和进行其他此类黑客攻击的情况下解决该问题.
I wonder if someone has suggestions on how to solve this hopefully without editing qt mkspecs files and doing other such hacks.
编辑 因此,我修改了mkspecs文件,如下所示:
EDIT So, I modified the mkspecs file as follows:
QMAKE_LFLAGS += -Wl,-rpath-link,$$[QT_SYSROOT]/opt/vc/lib
VC_LIBRARY_PATH = $$[QT_SYSROOT]/opt/vc/lib # prepended
VC_INCLUDE_PATH = $$[QT_SYSROOT]/opt/vc/include #prepended
# terrible, they do not appear to resolve "=" in rpath!
VC_LINK_LINE = -L=$${VC_LIBRARY_PATH} -Wl,-rpath-link,$$[QT_SYSROOT]$${VC_LIBRARY_PATH}
QMAKE_LIBDIR_OPENGL_ES2 = =$${VC_LIBRARY_PATH}
QMAKE_LIBDIR_EGL = $$QMAKE_LIBDIR_OPENGL_ES2
QMAKE_LIBDIR_OPENVG = $$QMAKE_LIBDIR_OPENGL_ES2
QMAKE_INCDIR_EGL = \
$${VC_INCLUDE_PATH} \
$${VC_INCLUDE_PATH}/interface/vcos/pthreads \
$${VC_INCLUDE_PATH}/interface/vmcs_host/linux
QMAKE_INCDIR_OPENGL_ES2 = $${QMAKE_INCDIR_EGL}
#QMAKE_LIBS_OPENGL_ES2 = $${VC_LINK_LINE} -lGLESv2 #original
QMAKE_LIBS_OPENGL_ES2 = -lGLESv2 #changed
# The official opt vc EGL references GLESv2 symbols: need to link it
#QMAKE_LIBS_EGL = $${VC_LINK_LINE} -lEGL -lGLESv2 #original
QMAKE_LIBS_EGL = -lEGL -lGLESv2 #changed
这会导致在尝试查找gles时出现链接错误:
And this results in the linking error when trying to find gles:
> /home/osboxes/Downloads/gcc-linaro-6.3.1-2017.05-x86_64_arm-linux-gnueabihf/bin/arm-linux-gnueabihf-g++ -Wl,-rpath-link,/mnt/pi-rootfs/opt/vc/lib -Wl,-rpath-link,/mnt/pi-rootfs/usr/lib/arm-linux-gnueabihf -Wl,-rpath-link,/mnt/pi-rootfs/lib/arm-linux-gnueabihf -mfloat-abi=hard --sysroot=/mnt/pi-rootfs --sysroot=/mnt/pi-rootfs -Wl,-O1 -fuse-ld=gold -o opengles2 opengles2.o -L=/mnt/pi-rootfs/opt/vc/lib -lGLESv2
> /home/osboxes/Downloads/gcc-linaro-6.3.1-2017.05-x86_64_arm-linux-gnueabihf/bin/../lib/gcc/arm-linux-gnueabihf/6.3.1/../../../../arm-linux-gnueabihf/bin/ld.gold: error: cannot find -lGLESv2
> opengles2.o:opengles2.cpp:function main: error: undefined reference to 'glUniform1f'
> opengles2.o:opengles2.cpp:function main: error: undefined reference to 'glClear'
> collect2: error: ld returned 1 exit status
> Makefile:65: recipe for target 'opengles2' failed
路径-L=/mnt/pi-rootfs/opt/vc/lib
是正确的,我确认这是glesv2库所在的位置.
The path -L=/mnt/pi-rootfs/opt/vc/lib
is correct and I verify that this is where the glesv2 library resides.
推荐答案
这是我使用的qmake.conf(对我有用):
This is the qmake.conf I used (it worked for me):
include(../common/linux_device_pre.conf)
QMAKE_LFLAGS += -Wl,-rpath-link,$$[QT_SYSROOT]/opt/vc/lib
QMAKE_LFLAGS += -Wl,-rpath-link,$$[QT_SYSROOT]/home/pi/qtdeps/lib
QMAKE_LIBDIR_OPENGL_ES2 = $$[QT_SYSROOT]/opt/vc/lib
QMAKE_LIBDIR_EGL = $$QMAKE_LIBDIR_OPENGL_ES2
QMAKE_LIBDIR_OPENVG = $$QMAKE_LIBDIR_OPENGL_ES2
QMAKE_INCDIR_EGL = $$[QT_SYSROOT]/opt/vc/include \
$$[QT_SYSROOT]/opt/vc/include/interface/vcos/pthreads \
$$[QT_SYSROOT]/opt/vc/include/interface/vmcs_host/linux
QMAKE_INCDIR_OPENGL_ES2 = $${QMAKE_INCDIR_EGL}
QMAKE_INCDIR_OPENVG = $${QMAKE_INCDIR_EGL}
QMAKE_LIBS_EGL = -lEGL -lGLESv2
QMAKE_LIBS_OPENVG = -lEGL -lOpenVG -lGLESv2
QMAKE_CFLAGS = -march=armv8-a -mtune=cortex-a53 -mfpu=crypto-neon-fp-armv8
QMAKE_CXXFLAGS = $$QMAKE_CFLAGS
DISTRO_OPTS += hard-float
DISTRO_OPTS += deb-multi-arch
# Preferred eglfs backend
EGLFS_DEVICE_INTEGRATION= eglfs_brcm
include(../common/linux_arm_device_post.conf)
load(qt_config)
这篇关于树莓派的Qt交叉编译:找不到GLESv2的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!