Cross compile Opencv for ARM [duplicate] - c++

Question

Hi guys I am doing an application in c++ for ARM. I have a application prototype which I compiled with cross compilation and it works very nice in the ARM. What I did was this:
First I got the .o file like this
arm-linux-g++ -c PrototipoTRU.cpp
Then I got the .exe like this (My application use thread)
arm-linux-g++ PrototipoTRU.o -o tru2 -pthread
and everything works perfect.
My problem is when I tried to compile an .cpp file which use OpenCV. I tried that:
First I tried to got the .o:
arm-linux-g++ -c camera.cpp
That does not work, I got this output:
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
So it seem that there is some problem with the link, however if do this:
g++ -c IPCamera.cpp
I got the .o file, but obviously when I get the .exe it does not work in the ARM . What I do not undestand is why if I compile an application without opencv, like the first example, the arm-linux-g++ works propertly and when I try to compile the openCV application no.
I tried to compiler also like this:
arm-linux-g++ -c IPCamera.cpp `pkg-config opencv --libs --cflags`
but is the same result, however if I do this:
g++ -c IPCamera.cpp `pkg-config opencv --libs --cflags`
It works. So I guess that is a path problem but I do not have idea how I can solved it.
Someone can help me??
Thank you guys
Hi dennisfen this is the content of mi file:
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

It seems that you need to set include path to your cross OpenCV installation:
arm-linux-g++ -I/path/to/opencv/include IPCamera.cpp -o tru2
When you call pkg-config it reports settings for you host system not for your arm cross toolchain.

Answer 2

As #dennisfen suggest you may need to set include path as well as the library path to your cross OpenCV with the libraries you are using as follows:
arm-linux-g++ -I/path/to/opencv/include -L/path/to/library IPCamera.cpp -o tru2 -lopencv_core -pthread