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Build OpenCV under MinGW

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cmake.png (33019 bytes)

download the OpenCV 2.4.6 source

http://sourceforge.net/projects/opencvlibrary/files/opencv-unix/2.4.6.1/opencv-2.4.6.1.tar.gz/download
Unzip the OpenCV 2.4.6 source to: D:\opencv246build\ Create a new folder D:\opencv246build\build-gcc482, this will hold the build objs, libs, binaries.
As we need to build this library, so only source is enough.

download MinGW-Builds Compiler suite

i686-4.8.2-release-posix-dwarf-rt_v3-rev0 - http://sourceforge.net/projects/mingw-w64/files/Toolchains%20targetting%20Win32/Personal%20Builds/mingw-builds/4.8.2/threads-posix/dwarf/i686-4.8.2-release-posix-dwarf-rt_v3-rev0.7z/download

download CMake

Put the bin path of the MinGW-Builds Compiler suite to your PATH

run CMake, and adjust some build options

In my build, the source code location is: D:\opencv246build
the build target location is: D:\opencv246build\build-gcc482
I use the Build type: Debug

So, the generated dll files will have debug information, you can step into its source code:

under command line prompt, run

mingw32-make
mingw32-make install

Now, all the installed files was in

D:\opencv246build\build-gcc482\install
So, you have:
D:\opencv246build\build-gcc482\install\bin to contain all the dlls
D:\opencv246build\build-gcc482\install\include to contain all the header files
D:\opencv246build\build-gcc482\install\lib to contain all the libraries

Note

When building, I have see a build error reporting like:
The linker can't find libvfw32.a when building highgui.
I checked the MinGW-Builds, and see one library named:
D:\mingw-builds\i686-4.8.2-release-posix-dwarf-rt_v3-rev0\mingw32\i686-w64-mingw32\lib\libmsvfw32.a
To solve this build error, you can just make a copy of libmsvfw32.a, and rename to libvfw32.a, then run mingw32-make again.

configure options

This is the configure options I use to build the Opencv library

Detected version of GNU GCC: 48 (408)
Performing Test HAVE_CXX_FNO_OMIT_FRAME_POINTER
Performing Test HAVE_CXX_FNO_OMIT_FRAME_POINTER - Success
Performing Test HAVE_C_FNO_OMIT_FRAME_POINTER
Performing Test HAVE_C_FNO_OMIT_FRAME_POINTER - Success
Could NOT find JNI (missing:  JAVA_AWT_LIBRARY JAVA_JVM_LIBRARY JAVA_INCLUDE_PATH JAVA_INCLUDE_PATH2 JAVA_AWT_INCLUDE_PATH) 

General configuration for OpenCV 2.4.6 =====================================
  Version control:               unknown

  Platform:
    Host:                        Windows 5.1 x86
    CMake:                       2.8.11.2
    CMake generator:             MinGW Makefiles
    CMake build tool:            D:/mingw-builds/i686-4.8.2-release-posix-dwarf-rt_v3-rev0/mingw32/bin/mingw32-make.exe
    Configuration:               Debug

  C/C++:
    Built as dynamic libs?:      YES
    C++ Compiler:                D:/mingw-builds/i686-4.8.2-release-posix-dwarf-rt_v3-rev0/mingw32/bin/i686-w64-mingw32-g++.exe  (ver 4.8.2)
    C++ flags (Release):         -fsigned-char -mstackrealign -W -Wall -Werror=return-type -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wno-narrowing -Wno-delete-non-virtual-dtor -fdiagnostics-show-option -march=i686 -fno-omit-frame-pointer -msse -msse2 -mfpmath=sse -ffunction-sections -O2 -DNDEBUG  -DNDEBUG
    C++ flags (Debug):           -fsigned-char -mstackrealign -W -Wall -Werror=return-type -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wno-narrowing -Wno-delete-non-virtual-dtor -fdiagnostics-show-option -march=i686 -fno-omit-frame-pointer -msse -msse2 -mfpmath=sse -ffunction-sections -g  -O0 -DDEBUG -D_DEBUG -ggdb3
    C Compiler:                  D:/mingw-builds/i686-4.8.2-release-posix-dwarf-rt_v3-rev0/mingw32/bin/i686-w64-mingw32-gcc.exe
    C flags (Release):           -fsigned-char -mstackrealign -W -Wall -Werror=return-type -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wno-narrowing -fdiagnostics-show-option -march=i686 -fno-omit-frame-pointer -msse -msse2 -mfpmath=sse -ffunction-sections -O2 -DNDEBUG  -DNDEBUG
    C flags (Debug):             -fsigned-char -mstackrealign -W -Wall -Werror=return-type -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wno-narrowing -fdiagnostics-show-option -march=i686 -fno-omit-frame-pointer -msse -msse2 -mfpmath=sse -ffunction-sections -g  -O0 -DDEBUG -D_DEBUG -ggdb3
    Linker flags (Release):      
    Linker flags (Debug):        
    Precompiled headers:         YES

  OpenCV modules:
    To be built:                 core imgproc flann highgui features2d calib3d ml video objdetect contrib legacy nonfree photo stitching superres ts videostab
    Disabled:                    gpu world
    Disabled by dependency:      -
    Unavailable:                 androidcamera java ocl python

  GUI: 
    QT:                          NO
    Win32 UI:                    YES
    OpenGL support:              NO

  Media I/O: 
    ZLib:                        build (ver 1.2.7)
    JPEG:                        build (ver 62)
    PNG:                         build (ver 1.5.12)
    TIFF:                        build (ver 42 - 4.0.2)
    JPEG 2000:                   NO
    OpenEXR:                     NO

  Video I/O:
    Video for Windows:           NO
    DC1394 1.x:                  NO
    DC1394 2.x:                  NO
    FFMPEG:                      YES (prebuilt binaries)
      codec:                     YES (ver 53.61.100)
      format:                    YES (ver 53.32.100)
      util:                      YES (ver 51.35.100)
      swscale:                   YES (ver 2.1.100)
      gentoo-style:              YES
    OpenNI:                      NO
    OpenNI PrimeSensor Modules:  NO
    PvAPI:                       NO
    GigEVisionSDK:               NO
    DirectShow:                  YES
    Media Foundation:            NO
    XIMEA:                       NO

  Other third-party libraries:
    Use IPP:                     NO
    Use Eigen:                   NO
    Use TBB:                     NO
    Use OpenMP:                  NO
    Use GCD                      NO
    Use Concurrency              NO
    Use C=:                      NO
    Use Cuda:                    NO
    Use OpenCL:                  NO

  Python:
    Interpreter:                 E:/code/Python27/python.exe (ver 2.7.5)

  Java:
    ant:                         NO
    JNI:                         NO
    Java tests:                  NO

  Tests and samples:
    Tests:                       NO
    Performance tests:           NO
    C/C++ Examples:              NO

  Install path:                  D:/opencv246build/build-gcc482/install

  cvconfig.h is in:              D:/opencv246build/build-gcc482
-----------------------------------------------------------------

Configuring done
Generating done

That's all, happy debugging!

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