Issue installing using coccapods

[amjadz]

This is the error I am getting when I install with Coccapods

`[!] /bin/bash -c
set -e
git submodule init
git submodule update
/usr/bin/python opencv/platforms/ios/build_framework.py ios --dynamic
cp -a ./ios/opencv2.framework ./opencv2.framework

Submodule path 'opencv': checked out '1522722fab8016638b2039257f1665e402285768'
Submodule 'opencv' (https://github.com/opencv/opencv.git) registered for path 'opencv'
Cloning into '/Users/zubairamjad/Library/Caches/CocoaPods/Pods/Release/OpenCV-Dynamic/4.0.0-1d0bc/opencv'...
xcode-select: error: tool 'xcodebuild' requires Xcode, but active developer directory '/Library/Developer/CommandLineTools' is a command line tools instance

ERROR: Command '['xcodebuild', '-version']' returned non-zero exit status 1

Traceback (most recent call last):
File "opencv/platforms/ios/build_framework.py", line 113, in build
self._build(outdir)
File "opencv/platforms/ios/build_framework.py", line 81, in _build
xcode_ver = getXCodeMajor()
File "opencv/platforms/ios/build_framework.py", line 41, in getXCodeMajor
ret = check_output(["xcodebuild", "-version"])
File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/subprocess.py", line 573, in check_output
raise CalledProcessError(retcode, cmd, output=output)
CalledProcessError: Command '['xcodebuild', '-version']' returned non-zero exit status 1`

Like i have no idea what is going on

[jondwillis]

Edit) Looks like this is an Xcode 10 issue. Updating CMake resolved it for me! opencv/opencv#12646

brew upgrade cmake

I tried updating OpenCV submodule and OpenCV-Dynamic's submodules, but this error still occurred.

To add to the error log for search engines:

The following build commands failed:
	CompileC /Users/jon/Library/Caches/CocoaPods/Pods/External/OpenCV-Dynamic/0bb9aeaef20d9b04170e14a14286f932/ios/build/build-iphoneos/modules/world/OpenCV.build/Release-iphoneos/opencv_world.build/Objects-normal/armv7s/opencl_kernels_video.o /Users/jon/Library/Caches/CocoaPods/Pods/External/OpenCV-Dynamic/0bb9aeaef20d9b04170e14a14286f932/ios/build/build-iphoneos/modules/world/opencl_kernels_video.cpp normal armv7s c++ com.apple.compilers.llvm.clang.1_0.compiler
(1 failure)
============================================================
ERROR: Command '['xcodebuild', 'IPHONEOS_DEPLOYMENT_TARGET=8.0', 'ONLY_ACTIVE_ARCH=NO', 'BITCODE_GENERATION_MODE=bitcode', '-arch', 'armv7', '-arch', 'armv7s', '-arch', 'arm64', '-sdk', 'iphoneos', '-configuration', 'Release', '-parallelizeTargets', '-jobs', '8', '-target', 'ALL_BUILD', '-target', 'ALL_BUILD', 'build']' returned non-zero exit status 65
============================================================
Traceback (most recent call last):
  File "opencv/platforms/ios/build_framework.py", line 117, in build
    self._build(outdir)
  File "opencv/platforms/ios/build_framework.py", line 109, in _build
    self.buildOne(t[0], t[1], mainBD, cmake_flags)
  File "opencv/platforms/ios/build_framework.py", line 205, in buildOne
    execute(buildcmd + ["-target", "ALL_BUILD", "build"], cwd = builddir)
  File "opencv/platforms/ios/build_framework.py", line 39, in execute
    retcode = check_call(cmd, cwd = cwd)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/subprocess.py", line 540, in check_call
    raise CalledProcessError(retcode, cmd)
CalledProcessError: Command '['xcodebuild', 'IPHONEOS_DEPLOYMENT_TARGET=8.0', 'ONLY_ACTIVE_ARCH=NO', 'BITCODE_GENERATION_MODE=bitcode', '-arch', 'armv7', '-arch', 'armv7s', '-arch', 'arm64', '-sdk', 'iphoneos', '-configuration', 'Release', '-parallelizeTargets', '-jobs', '8', '-target', 'ALL_BUILD', '-target', 'ALL_BUILD', 'build']' returned non-zero exit status 65

[ianboru]

@jondwillis were you able to successfully use LegoCV in XCode 10? I used the LegoCV pod and I'm getting tons of semantic warnings, plus errors about non existent members and functions. For example "no matching function for call to 'rectangle' OCVImageOperation.mm

[t0rn]

try
sudo xcode-select -s /Applications/Xcode.app/Contents/Developer