Question

大家好我正在用ARM进行c ++应用程序。我有一个应用程序原型，我用交叉编译编译，它在ARM中运行得非常好。我做的是这个：

首先我得到了像这样的.o文件

arm-linux-g++ -c PrototipoTRU.cpp

然后我得到了这样的.exe（我的应用程序使用线程）

arm-linux-g++ PrototipoTRU.o -o tru2 -pthread

一切都很完美。

我的问题是当我尝试编译使用OpenCV的.cpp文件时。我试过了：

首先我试着得到.o：

 arm-linux-g++ -c camera.cpp

这不起作用，我得到了这个输出：

IPCamera.cpp:5:30: error: opencv2/opencv.hpp: No such file or directory
IPCamera.cpp:6:39: error: opencv2/highgui/highgui.hpp: No such file or directory
IPCamera.cpp:7:39: error: opencv2/imgproc/imgproc.hpp: No such file or directory
IPCamera.cpp:11:22: error: X11/Xlib.h: No such file or directory
IPCamera.cpp:16: error: 'cv' is not a namespace-name
IPCamera.cpp:16: error: expected namespace-name before ';' token
IPCamera.cpp: In function 'int main(int, char**)':
IPCamera.cpp:46: error: 'cv' has not been declared
IPCamera.cpp:46: error: expected ';' before 'cap'
IPCamera.cpp:52: error: 'Display' was not declared in this scope
IPCamera.cpp:52: error: 'disp' was not declared in this scope
IPCamera.cpp:52: error: 'XOpenDisplay' was not declared in this scope
IPCamera.cpp:53: error: 'Screen' was not declared in this scope
IPCamera.cpp:53: error: 'scrn' was not declared in this scope
IPCamera.cpp:53: error: 'DefaultScreenOfDisplay' was not declared in this scope
IPCamera.cpp:63: error: 'cv' has not been declared
IPCamera.cpp:63: error: expected ';' before 'frame'
IPCamera.cpp:66: error: 'cv' has not been declared
IPCamera.cpp:66: error: 'CV_WINDOW_NORMAL' was not declared in this scope
IPCamera.cpp:68: error: 'cvMoveWindow' was not declared in this scope
IPCamera.cpp:73: error: 'CV_WND_PROP_FULLSCREEN' was not declared in this scope
IPCamera.cpp:73: error: 'CV_WINDOW_FULLSCREEN' was not declared in this scope
IPCamera.cpp:73: error: 'cvSetWindowProperty' was not declared in this scope
IPCamera.cpp:79: error: 'cap' was not declared in this scope
IPCamera.cpp:82: error: 'frame' was not declared in this scope
IPCamera.cpp:89: error: 'cv' has not been declared
IPCamera.cpp:92: error: 'cv' has not been declared

所以看起来链接存在一些问题，但是如果这样做：

 g++ -c IPCamera.cpp

我得到了.o文件，但很明显当我得到.exe时它在ARM中不起作用。我没有理解的是为什么如果我编译一个没有opencv的应用程序，就像第一个例子一样，arm-linux-g ++可以正常工作，当我尝试编译openCV应用程序时没有。

我尝试编译也是这样的：

 arm-linux-g++ -c IPCamera.cpp `pkg-config opencv --libs --cflags`

但结果相同，但如果我这样做：

 g++ -c IPCamera.cpp `pkg-config opencv --libs --cflags`

有效。所以我想这是一个路径问题，但我不知道如何解决它。

有人可以帮助我吗？

谢谢你们

你好dennisfen这是mi文件的内容：

 set(CMAKE_SYSTEM_NAME Linux)
 set(CMAKE_SYSTEM_VERSION 1)
 set(CMAKE_SYSTEM_PROCESSOR arm)

 set(GCC_COMPILER_VERSION "4.6" CACHE STRING "GCC Compiler version")

 set(FLOAT_ABI_SUFFIX "")

 if (NOT SOFTFP)
   set(FLOAT_ABI_SUFFIX "hf")
 endif()

 set(CMAKE_C_COMPILER    arm-linux- 
 gnueabi${FLOAT_ABI_SUFFIX}-gcc-${GCC_COMPILER_VERSION})
 set(CMAKE_CXX_COMPILER  arm-linux-
 gnueabi${FLOAT_ABI_SUFFIX}-g++-${GCC_COMPILER_VERSION})
 set(ARM_LINUX_SYSROOT /usr/arm-linux-gnueabi${FLOAT_ABI_SUFFIX} CACHE PATH "ARM cross 
 compilation system root")

 set(CMAKE_CXX_FLAGS           ""                    CACHE STRING "c++ flags")
 set(CMAKE_C_FLAGS             ""                    CACHE STRING "c flags")
 set(CMAKE_SHARED_LINKER_FLAGS ""                    CACHE STRING "shared linker flags")
 set(CMAKE_MODULE_LINKER_FLAGS ""                    CACHE STRING "module linker flags")
 set(CMAKE_EXE_LINKER_FLAGS    "-Wl,-z,nocopyreloc"  CACHE STRING "executable linker 
 flags")

 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -mthumb -fdata-sections -Wa,--noexecstack 
 -fsigned-char -Wno-psabi")
 set(CMAKE_C_FLAGS   "${CMAKE_C_FLAGS} -mthumb -fdata-sections -Wa,--noexecstack 
 -fsigned-char -Wno-psabi")

 set(CMAKE_SHARED_LINKER_FLAGS "-Wl,--fix-cortex-a8 -Wl,--no-undefined -Wl,--gc-
 sections -Wl,-z,noexecstack -Wl,-z,relro -Wl,-z,now ${CMAKE_SHARED_LINKER_FLAGS}")
 set(CMAKE_MODULE_LINKER_FLAGS "-Wl,--fix-cortex-a8 -Wl,--no-undefined -Wl,--gc-
 sections -Wl,-z,noexecstack -Wl,-z,relro -Wl,-z,now ${CMAKE_MODULE_LINKER_FLAGS}")
 set(CMAKE_EXE_LINKER_FLAGS    "-Wl,--fix-cortex-a8 -Wl,--no-undefined -Wl,--gc-
 sections -Wl,-z,noexecstack -Wl,-z,relro -Wl,-z,now ${CMAKE_EXE_LINKER_FLAGS}")

Answer 1

您似乎需要为您的跨OpenCV安装设置包含路径：

arm-linux-g++ -I/path/to/opencv/include IPCamera.cpp -o tru2

当您致电pkg-config时，它会报告主机系统的设置，而不是您的手臂交叉工具链。

Answer 2

正如@dennisfen建议您可能需要设置包含路径以及使用您正在使用的库交叉OpenCV的库路径，如下所示：

arm-linux-g++ -I/path/to/opencv/include -L/path/to/library IPCamera.cpp -o tru2 -lopencv_core -pthread

交叉编译openCV应用程序

2 个答案: