opencv framework for iOS error

Question

I am trying to build the opencv framework for Xcode. I am new to the Mac world as well as opencv. I followed the instructions as given on

http://docs.opencv.org/doc/tutorials/introduction/ios_install/ios_install.html

I cloned the repository (opencv 2.4.7) and then tried running the python script - as per the instruction on the link

python opencv/platforms/ios/build_framework.py ios

I get the below error, can someone please help? I am using OSX 10.8.5

Applications/gebos_third_party_apps/opencv/3rdparty/zlib/gzwrite.c:84:15:
note: did you mean 'fwrite'? got = write(state->fd, strm->next_in, strm->avail_in); ^~~~~ fwrite In file included from /Applications/gebos_third_party_apps/opencv/3rdparty/zlib/gzwrite.c:6: In file included from /Applications/gebos_third_party_apps/opencv/3rdparty/zlib/gzguts.h:21:
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator7.0.sdk/usr/include/stdio.h:252:9:
note: 'fwrite' declared here size_t fwrite(const void * __restrict, size_t, size_t, FILE * __restrict) __DARWIN_ALIAS(fwrite); ^ /Applications/gebos_third_party_apps/opencv/3rdparty/zlib/gzwrite.c:573:9: error: implicit declaration of function 'close' is invalid in C99 [-Werror,-Wimplicit-function-declaration] if (close(state->fd) == -1) ^ 2 errors generated.
** INSTALL FAILED **

The following build commands failed: CompileC /Applications/gebos_third_party_apps/ios/build/iPhoneSimulator-x86_64/3rdparty/zlib/OpenCV.build/Release-iphonesimulator/zlib.build/Objects-normal/x86_64/gzwrite.o
3rdparty/zlib/gzwrite.c normal x86_64 c com.apple.compilers.llvm.clang.1_0.compiler CompileC /Applications/gebos_third_party_apps/ios/build/iPhoneSimulator-x86_64/3rdparty/zlib/OpenCV.build/Release-iphonesimulator/zlib.build/Objects-normal/x86_64/gzlib.o 3rdparty/zlib/gzlib.c normal x86_64 c com.apple.compilers.llvm.clang.1_0.compiler CompileC /Applications/gebos_third_party_apps/ios/build/iPhoneSimulator-x86_64/3rdparty/zlib/OpenCV.build/Release-iphonesimulator/zlib.build/Objects-normal/x86_64/gzread.o 3rdparty/zlib/gzread.c normal x86_64 c com.apple.compilers.llvm.clang.1_0.compiler (3 failures) Traceback (most recent call last): File "opencv-lib/opencv/platforms/ios/build_framework.py", line 112, in build_framework(os.path.abspath(os.path.join(os.path.dirname(sys.argv[0]), "../..")), os.path.abspath(sys.argv[1])) File "opencv-lib/opencv/platforms/ios/build_framework.py", line 104, in build_framework put_framework_together(srcroot, dstroot) File "opencv-lib/opencv/platforms/ios/build_framework.py", line 80, in put_framework_together shutil.copytree(tdir0 + "/install/include/opencv2", dstdir + "/Headers") File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/shutil.py", line 168, in copytree names = os.listdir(src) OSError: [Errno 2] No such file or directory: '../build/iPhoneOS-arm64/install/include/opencv2'

tlrobinson · Accepted Answer · 2013-12-14 06:21:01Z

8

Sadly, the best way around this, other than fixing the zlib warnings directly, is to add -Wno-implicit-function-declaration to your C_FLAGS ... this can added to build_framework.py in the cmakeargs list as -DCMAKE_C_FLAGS=\"-Wno-implicit-function-declaration\":

cmakeargs = ("-GXcode " +
            "-DCMAKE_BUILD_TYPE=Release " +
            "-DCMAKE_C_FLAGS=\"-Wno-implicit-function-declaration\" " +
            "-DCMAKE_TOOLCHAIN_FILE=%s/platforms/ios/cmake/Toolchains/Toolchain-%s_Xcode.cmake " +
            "-DBUILD_opencv_world=ON " +
            "-DCMAKE_INSTALL_PREFIX=install") % (srcroot, target)

.....

edited Dec 14, 2013 at 6:21

tlrobinson

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answered Dec 7, 2013 at 17:43

Kaolin Fire

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lobudge · Accepted Answer · 2014-06-20 20:06:46Z

4

I had the same error. The suggested edit to the install instructions mentioned here (http://code.opencv.org/issues/3587) fixed it for me. Specifically, cd to the directory containing build_framework.py and run the install from there with a fully qualified destination directory.

i.e.:

cd ~/<my_working_directory>/opencv/platforms/ios/
python build_framework.py ~/<my_working_directory>/ios

The other note worth mentioning is that as of my testing, it is no longer necessary to create the Developer symlink in the root directory.

answered Jun 20, 2014 at 20:06

lobudge

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