opencv_img_hash prevent from building App Store dynamic framework

[emaschino]

Hi,

Even though I've hit this issue with OpenCV 4.0.1, I think that the problem is still there with current OpenCV, as opencv_img_hash is excluded from opencv_world because of set(OPENCV_MODULE_IS_PART_OF_WORLD OFF) in its CMakeLists.txt.

Trying to build App Store dynamic framework thus failed as both opencv_world and opencv_img_hash are trying to produce opencv2.framework (from my limited understanding):

% python3 build_framework.py --contrib <opencv_contrib> --dynamic

ends up with:

error: Multiple commands produce '<outdir>/build/build-arm64-iphoneos/lib/Release/opencv2.framework/opencv2'
    note: Target 'opencv_img_hash' (project 'OpenCV') has link command with output '<outdir>/build/build-arm64-iphoneos/lib/Release/opencv2.framework/opencv2'
    note: Target 'opencv_world' (project 'OpenCV') has link command with output '<outdir>/build/build-arm64-iphoneos/lib/Release/opencv2.framework/opencv2'
error: Multiple commands produce '<Linked Binary <outdir>/build/build-arm64-iphoneos/lib/Release/opencv2.framework/opencv2>'
    note: Target 'opencv_img_hash' (project 'OpenCV') has link command with output '<outdir>/build/build-arm64-iphoneos/lib/Release/opencv2.framework/opencv2'
    note: Target 'opencv_world' (project 'OpenCV') has link command with output '<outdir>/build/build-arm64-iphoneos/lib/Release/opencv2.framework/opencv2'
error: Multiple commands produce '<MkDir <outdir>/build/build-arm64-iphoneos/lib/Release/opencv2.framework>'
    note: Target 'opencv_img_hash' (project 'OpenCV') has create directory command with output '<outdir>/build/build-arm64-iphoneos/lib/Release/opencv2.framework'
    note: Target 'opencv_world' (project 'OpenCV') has create directory command with output '<outdir>/build/build-arm64-iphoneos/lib/Release/opencv2.framework'
error: Multiple commands produce '<outdir>/build/build-arm64-iphoneos/lib/Release/opencv2.framework/Info.plist'
    note: Target 'opencv_img_hash' (project 'OpenCV') has process command with output '<outdir>/build/build-arm64-iphoneos/lib/Release/opencv2.framework/Info.plist'
    note: Target 'opencv_world' (project 'OpenCV') has process command with output '<outdir>/build/build-arm64-iphoneos/lib/Release/opencv2.framework/Info.plist'
error: Multiple commands produce '<RegisterExecutionPolicyException <outdir>/build/build-arm64-iphoneos/lib/Release/opencv2.framework>'
    note: Target 'opencv_img_hash' (project 'OpenCV'): RegisterExecutionPolicyException <outdir>/build/build-arm64-iphoneos/lib/Release/opencv2.framework
    note: Target 'opencv_world' (project 'OpenCV'): RegisterExecutionPolicyException <outdir>/build/build-arm64-iphoneos/lib/Release/opencv2.framework
error: Multiple commands produce '<Touch <outdir>/build/build-arm64-iphoneos/lib/Release/opencv2.framework>'
    note: Target 'opencv_img_hash' (project 'OpenCV'): Touch <outdir>/build/build-arm64-iphoneos/lib/Release/opencv2.framework
    note: Target 'opencv_world' (project 'OpenCV'): Touch <outdir>/build/build-arm64-iphoneos/lib/Release/opencv2.framework

Excluding opencv_img_hash module is a workaround. Anonymized OpenCV's build log attached, if needed.

opencv_build.log