If you are here just to cross-compile OpenCV, follow these simple instructions. The older post is a little more detailed, error-prone, pedantic, and maybe out of date.
If you want to cross-compile OpenCV from source code, you can do by next steps.
- Building OpenCV 2.1 requiers CMake. You can easily install it by using MacPorts, or follow the installation instructions at the CMake website.
% sudo port install cmake - Clone this project from github, then move into the project directory
% git clone git://github.com/gonzojive/iphone_opencv_test.git % cd iphone_opencv_test - Download the source code for OpenCV from Sourceforge. Save OpenCV-2.1.0.tar.bz2 into the project root.
- Use the provided Makefile:
% make
This will extract the downloaded archive, apply a patch to the OpenCV code, generate appropriate cmakefile suport using the opencv_cmake.sh script, and finally make the static libraries for simulator and device. The libraries will be in the opencv_{device,simulator} directories, and may be linked in XCode etc.
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[...] Edit November 24, 2010: Building OpenCV [...]
Awesome. Just what I was looking for. Just wondering… do you happen to have an updated patch file for 2.2.0 ?
I don’t, but the patch is pretty minor and may work as-is. I’ll give it a shot in the future. Have there been any iPhone-relevant changes in 2.2?
This script is great! It works. I have one more question: how to enable highgui API in the iphone build?
I haven’t tried. I believe highgui has more dependencies, which would require compiling things like libpng and libtiff for iPhone. I have compiled those libraries for iPhone, too, but haven’t needed highgui. let me know if you find additional instructions for highgui, and I can post them here
Hi,
I hope this web page is still being seen by people that know what they are doing!
When i run the make command i am getting the following output:-
if test -d “OpenCV-2.1.0″; \
then echo “OpenCV-2.1.0″ exists, no need to extract; \
else tar xjf “OpenCV-2.1.0″.tar.bz2; \
fi
cd “OpenCV-2.1.0″; patch -p1 < ../"OpenCV-2.1.0".patch
patching file CMakeLists.txt
patching file src/CMakeLists.txt
mkdir -p build_simulator; \
cd build_simulator; \
../opencv_cmake.sh Simulator ../"OpenCV-2.1.0"; \
make -j 4; \
make install;
Starting cmake…
Target SDK = iPhoneSimulator
iOS SDK Version = 4.1
iOS Deployment Target = 3.0
OpenCV Root = ../OpenCV-2.1.0
OpenCV Install Prefix = /Users/richardfoster/iphone_opencv_test/build_simulator/../opencv_simulator
– The C compiler identification is GNU
– The CXX compiler identification is GNU
– Checking whether C compiler has -isysroot
– Checking whether C compiler has -isysroot – yes
– Checking whether C compiler supports OSX deployment target flag
– Checking whether C compiler supports OSX deployment target flag – yes
– Check for working C compiler: /Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/gcc
– Check for working C compiler: /Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/gcc — broken
CMake Error at /opt/local/share/cmake-2.8/Modules/CMakeTestCCompiler.cmake:52 (MESSAGE):
The C compiler
"/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/gcc" is
not able to compile a simple test program.
It fails with the following output:
Change Dir: /Users/richardfoster/iphone_opencv_test/build_simulator/CMakeFiles/CMakeTmp
Run Build Command:/usr/bin/make "cmTryCompileExec/fast"
/usr/bin/make -f CMakeFiles/cmTryCompileExec.dir/build.make
CMakeFiles/cmTryCompileExec.dir/build
/opt/local/bin/cmake -E cmake_progress_report
/Users/richardfoster/iphone_opencv_test/build_simulator/CMakeFiles/CMakeTmp/CMakeFiles
1
Building C object CMakeFiles/cmTryCompileExec.dir/testCCompiler.c.o
/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/gcc
-isysroot
/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator4.1.sdk
-mmacosx-version-min="10.6" -o
CMakeFiles/cmTryCompileExec.dir/testCCompiler.c.o -c
/Users/richardfoster/iphone_opencv_test/build_simulator/CMakeFiles/CMakeTmp/testCCompiler.c
Linking C executable cmTryCompileExec
/opt/local/bin/cmake -E cmake_link_script
CMakeFiles/cmTryCompileExec.dir/link.txt –verbose=1
/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/gcc
-isysroot
/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator4.1.sdk
-mmacosx-version-min="10.6" -Wl,-search_paths_first
-Wl,-headerpad_max_install_names
CMakeFiles/cmTryCompileExec.dir/testCCompiler.c.o -o cmTryCompileExec
ld: warning: in
/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator4.1.sdk/usr/lib/libSystem.dylib,
file was built for i386 which is not the architecture being linked (x86_64)
Undefined symbols:
"_exit", referenced from:
start in crt1.10.6.o
ld: symbol(s) not found
collect2: ld returned 1 exit status
make[2]: *** [cmTryCompileExec] Error 1
make[1]: *** [cmTryCompileExec/fast] Error 2
CMake will not be able to correctly generate this project.
Call Stack (most recent call first):
CMakeLists.txt:39 (project)
– Configuring incomplete, errors occurred!
make[1]: *** No targets specified and no makefile found. Stop.
make[1]: *** No rule to make target `install'. Stop.
make: *** [opencv-simulator] Error 2
Is there anybody that knows what the problem could be here. Could it be because the version of cmake I have is for the wrong operation system?
Thanks.
I’m having the same issue as Richard. Any suggestions? /Developer has XCode 3.2.6 installed.
I have the same error with Richard, please suggest a solution, thank you!
Hi -
I’m wondering if anyone resolved the issue Richard or Michael was having?
I’m having the same issue as Richard. Any suggestions?
Look at the yoshimasa niwa http://niw.at/articles/2009/03/14/using-opencv-on-iphone/en explaining how to configure version 2.2.0 with Xcode 4 and iOS SDK 4.3
CMake is available as a dmg pkg installer for OSX Leopard and later, here:
http://www.cmake.org/cmake/resources/software.html