Open Source Computer Vision Library https://opencv.org/
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#!/usr/bin/env python
"""
The script builds OpenCV.framework for iOS.
The built framework is universal, it can be used to build app and run it on either iOS simulator or real device.
Usage:
./build_framework.py <outputdir>
By cmake conventions (and especially if you work with OpenCV repository),
the output dir should not be a subdirectory of OpenCV source tree.
Script will create <outputdir>, if it's missing, and a few its subdirectories:
<outputdir>
build/
iPhoneOS-*/
[cmake-generated build tree for an iOS device target]
iPhoneSimulator-*/
[cmake-generated build tree for iOS simulator]
{framework_name}.framework/
[the framework content]
samples/
[sample projects]
docs/
[documentation]
The script should handle minor OpenCV updates efficiently
- it does not recompile the library from scratch each time.
However, {framework_name}.framework directory is erased and recreated on each run.
Adding --dynamic parameter will build {framework_name}.framework as App Store dynamic framework. Only iOS 8+ versions are supported.
"""
from __future__ import print_function
import glob, re, os, os.path, shutil, string, sys, argparse, traceback, multiprocessing
from subprocess import check_call, check_output, CalledProcessError
from distutils.dir_util import copy_tree
IPHONEOS_DEPLOYMENT_TARGET='8.0' # default, can be changed via command line options or environment variable
def execute(cmd, cwd = None):
print("Executing: %s in %s" % (cmd, cwd), file=sys.stderr)
print('Executing: ' + ' '.join(cmd))
retcode = check_call(cmd, cwd = cwd)
if retcode != 0:
raise Exception("Child returned:", retcode)
def getXCodeMajor():
ret = check_output(["xcodebuild", "-version"])
m = re.match(r'Xcode\s+(\d+)\..*', ret, flags=re.IGNORECASE)
if m:
return int(m.group(1))
else:
raise Exception("Failed to parse Xcode version")
def getXCodeSetting(var, projectdir):
ret = check_output(["xcodebuild", "-showBuildSettings"], cwd = projectdir)
m = re.search("\s" + var + " = (.*)", ret)
if m:
return m.group(1)
else:
raise Exception("Failed to parse Xcode settings")
class Builder:
def __init__(self, opencv, contrib, dynamic, bitcodedisabled, exclude, disable, enablenonfree, targets, debug, debug_info, framework_name, run_tests, build_docs):
self.opencv = os.path.abspath(opencv)
self.contrib = None
if contrib:
modpath = os.path.join(contrib, "modules")
if os.path.isdir(modpath):
self.contrib = os.path.abspath(modpath)
else:
print("Note: contrib repository is bad - modules subfolder not found", file=sys.stderr)
self.dynamic = dynamic
self.bitcodedisabled = bitcodedisabled
self.exclude = exclude
self.build_objc_wrapper = not "objc" in self.exclude
self.disable = disable
self.enablenonfree = enablenonfree
self.targets = targets
self.debug = debug
self.debug_info = debug_info
self.framework_name = framework_name
self.run_tests = run_tests
self.build_docs = build_docs
def getBuildDir(self, parent, target):
res = os.path.join(parent, 'build-%s-%s' % (target[0].lower(), target[1].lower()))
if not os.path.isdir(res):
os.makedirs(res)
return os.path.abspath(res)
def _build(self, outdir):
outdir = os.path.abspath(outdir)
if not os.path.isdir(outdir):
os.makedirs(outdir)
main_working_dir = os.path.join(outdir, "build")
dirs = []
xcode_ver = getXCodeMajor()
# build each architecture separately
alltargets = []
for target_group in self.targets:
for arch in target_group[0]:
current = ( arch, target_group[1] )
alltargets.append(current)
for target in alltargets:
main_build_dir = self.getBuildDir(main_working_dir, target)
dirs.append(main_build_dir)
cmake_flags = []
if self.contrib:
cmake_flags.append("-DOPENCV_EXTRA_MODULES_PATH=%s" % self.contrib)
if xcode_ver >= 7 and target[1] == 'iPhoneOS' and self.bitcodedisabled == False:
cmake_flags.append("-DCMAKE_C_FLAGS=-fembed-bitcode")
cmake_flags.append("-DCMAKE_CXX_FLAGS=-fembed-bitcode")
self.buildOne(target[0], target[1], main_build_dir, cmake_flags)
if not self.dynamic:
self.mergeLibs(main_build_dir)
else:
self.makeDynamicLib(main_build_dir)
self.makeFramework(outdir, dirs)
if self.build_objc_wrapper:
if self.run_tests:
check_call([sys.argv[0].replace("build_framework", "run_tests"), "--framework_dir=" + outdir, "--framework_name=" + self.framework_name, dirs[0] + "/modules/objc/test"])
else:
print("To run tests call:")
print(sys.argv[0].replace("build_framework", "run_tests") + " --framework_dir=" + outdir + " --framework_name=" + self.framework_name + " " + dirs[0] + "/modules/objc/test")
if self.build_docs:
check_call([sys.argv[0].replace("build_framework", "build_docs"), dirs[0] + "/modules/objc/framework_build"])
doc_path = os.path.join(dirs[0], "modules", "objc", "doc_build", "docs")
if os.path.exists(doc_path):
shutil.copytree(doc_path, os.path.join(outdir, "docs"))
shutil.copyfile(os.path.join(self.opencv, "doc", "opencv.ico"), os.path.join(outdir, "docs", "favicon.ico"))
else:
print("To build docs call:")
print(sys.argv[0].replace("build_framework", "build_docs") + " " + dirs[0] + "/modules/objc/framework_build")
self.copy_samples(outdir)
def build(self, outdir):
try:
self._build(outdir)
except Exception as e:
print("="*60, file=sys.stderr)
print("ERROR: %s" % e, file=sys.stderr)
print("="*60, file=sys.stderr)
traceback.print_exc(file=sys.stderr)
sys.exit(1)
def getToolchain(self, arch, target):
return None
def getConfiguration(self):
return "Debug" if self.debug else "Release"
def getCMakeArgs(self, arch, target):
args = [
"cmake",
"-GXcode",
"-DAPPLE_FRAMEWORK=ON",
"-DCMAKE_INSTALL_PREFIX=install",
"-DCMAKE_BUILD_TYPE=%s" % self.getConfiguration(),
"-DOPENCV_INCLUDE_INSTALL_PATH=include",
"-DOPENCV_3P_LIB_INSTALL_PATH=lib/3rdparty",
"-DFRAMEWORK_NAME=%s" % self.framework_name,
] + ([
"-DBUILD_SHARED_LIBS=ON",
"-DCMAKE_MACOSX_BUNDLE=ON",
"-DCMAKE_XCODE_ATTRIBUTE_CODE_SIGNING_REQUIRED=NO",
] if self.dynamic and not self.build_objc_wrapper else []) + ([
"-DDYNAMIC_PLIST=ON"
] if self.dynamic else []) + ([
"-DOPENCV_ENABLE_NONFREE=ON"
] if self.enablenonfree else []) + ([
"-DBUILD_WITH_DEBUG_INFO=ON"
] if self.debug_info else [])
if len(self.exclude) > 0:
args += ["-DBUILD_opencv_%s=OFF" % m for m in self.exclude]
if len(self.disable) > 0:
args += ["-DWITH_%s=OFF" % f for f in self.disable]
return args
def getBuildCommand(self, arch, target):
buildcmd = [
"xcodebuild",
]
if (self.dynamic or self.build_objc_wrapper) and not self.bitcodedisabled and target == "iPhoneOS":
buildcmd.append("BITCODE_GENERATION_MODE=bitcode")
buildcmd += [
"IPHONEOS_DEPLOYMENT_TARGET=" + os.environ['IPHONEOS_DEPLOYMENT_TARGET'],
"ARCHS=%s" % arch,
]
buildcmd += [
"-sdk", target.lower(),
"-configuration", self.getConfiguration(),
"-parallelizeTargets",
"-jobs", str(multiprocessing.cpu_count()),
]
return buildcmd
def getInfoPlist(self, builddirs):
return os.path.join(builddirs[0], "ios", "Info.plist")
def makeCMakeCmd(self, arch, target, dir, cmakeargs = []):
toolchain = self.getToolchain(arch, target)
cmakecmd = self.getCMakeArgs(arch, target) + \
(["-DCMAKE_TOOLCHAIN_FILE=%s" % toolchain] if toolchain is not None else [])
if target.lower().startswith("iphoneos"):
cmakecmd.append("-DCPU_BASELINE=DETECT")
if target.lower() == "macosx":
build_arch = check_output(["uname", "-m"]).rstrip()
if build_arch != arch:
cmakecmd.append("-DCMAKE_SYSTEM_PROCESSOR=" + arch)
cmakecmd.append("-DCMAKE_OSX_ARCHITECTURES=" + arch)
cmakecmd.append("-DCPU_BASELINE=DETECT")
cmakecmd.append("-DCMAKE_CROSSCOMPILING=ON")
cmakecmd.append("-DOPENCV_WORKAROUND_CMAKE_20989=ON")
cmakecmd.append(dir)
cmakecmd.extend(cmakeargs)
return cmakecmd
def buildOne(self, arch, target, builddir, cmakeargs = []):
# Run cmake
#toolchain = self.getToolchain(arch, target)
#cmakecmd = self.getCMakeArgs(arch, target) + \
# (["-DCMAKE_TOOLCHAIN_FILE=%s" % toolchain] if toolchain is not None else [])
#if target.lower().startswith("iphoneos"):
# cmakecmd.append("-DCPU_BASELINE=DETECT")
#cmakecmd.append(self.opencv)
#cmakecmd.extend(cmakeargs)
cmakecmd = self.makeCMakeCmd(arch, target, self.opencv, cmakeargs)
execute(cmakecmd, cwd = builddir)
# Clean and build
clean_dir = os.path.join(builddir, "install")
if os.path.isdir(clean_dir):
shutil.rmtree(clean_dir)
buildcmd = self.getBuildCommand(arch, target)
execute(buildcmd + ["-target", "ALL_BUILD", "build"], cwd = builddir)
execute(["cmake", "-DBUILD_TYPE=%s" % self.getConfiguration(), "-P", "cmake_install.cmake"], cwd = builddir)
if self.build_objc_wrapper:
cmakecmd = self.makeCMakeCmd(arch, target, builddir + "/modules/objc/gen", cmakeargs)
cmakecmd.append("-DBUILD_ROOT=%s" % builddir)
cmakecmd.append("-DCMAKE_INSTALL_NAME_TOOL=install_name_tool")
cmakecmd.append("--no-warn-unused-cli")
execute(cmakecmd, cwd = builddir + "/modules/objc/framework_build")
execute(buildcmd + ["-target", "ALL_BUILD", "build"], cwd = builddir + "/modules/objc/framework_build")
execute(["cmake", "-DBUILD_TYPE=%s" % self.getConfiguration(), "-DCMAKE_INSTALL_PREFIX=%s" % (builddir + "/install"), "-P", "cmake_install.cmake"], cwd = builddir + "/modules/objc/framework_build")
def mergeLibs(self, builddir):
res = os.path.join(builddir, "lib", self.getConfiguration(), "libopencv_merged.a")
libs = glob.glob(os.path.join(builddir, "install", "lib", "*.a"))
module = [os.path.join(builddir, "install", "lib", self.framework_name + ".framework", self.framework_name)] if self.build_objc_wrapper else []
libs3 = glob.glob(os.path.join(builddir, "install", "lib", "3rdparty", "*.a"))
print("Merging libraries:\n\t%s" % "\n\t".join(libs + libs3 + module), file=sys.stderr)
execute(["libtool", "-static", "-o", res] + libs + libs3 + module)
def makeDynamicLib(self, builddir):
target = builddir[(builddir.rfind("build-") + 6):]
target_platform = target[(target.rfind("-") + 1):]
is_device = target_platform == "iphoneos"
res = os.path.join(builddir, "install", "lib", self.framework_name + ".framework", self.framework_name)
libs = glob.glob(os.path.join(builddir, "install", "lib", "*.a"))
module = [os.path.join(builddir, "lib", self.getConfiguration(), self.framework_name + ".framework", self.framework_name)]
libs3 = glob.glob(os.path.join(builddir, "install", "lib", "3rdparty", "*.a"))
link_target = target[:target.find("-")] + "-apple-ios" + os.environ['IPHONEOS_DEPLOYMENT_TARGET'] + ("-simulator" if target.endswith("simulator") else "")
bitcode_flags = ["-fembed-bitcode", "-Xlinker", "-bitcode_verify"] if is_device and not self.bitcodedisabled else []
toolchain_dir = getXCodeSetting("TOOLCHAIN_DIR", builddir)
swift_link_dirs = ["-L" + toolchain_dir + "/usr/lib/swift/" + target_platform, "-L/usr/lib/swift"]
sdk_dir = getXCodeSetting("SDK_DIR", builddir)
execute([
"clang++",
"-Xlinker", "-rpath",
"-Xlinker", "/usr/lib/swift",
"-target", link_target,
"-isysroot", sdk_dir,
"-install_name", "@rpath/" + self.framework_name + ".framework/" + self.framework_name,
"-dynamiclib", "-dead_strip", "-fobjc-link-runtime", "-all_load",
"-o", res
] + swift_link_dirs + bitcode_flags + module + libs + libs3)
def makeFramework(self, outdir, builddirs):
name = self.framework_name
# set the current dir to the dst root
framework_dir = os.path.join(outdir, "%s.framework" % name)
if os.path.isdir(framework_dir):
shutil.rmtree(framework_dir)
os.makedirs(framework_dir)
if self.dynamic:
dstdir = framework_dir
else:
dstdir = os.path.join(framework_dir, "Versions", "A")
# copy headers from one of build folders
shutil.copytree(os.path.join(builddirs[0], "install", "include", "opencv2"), os.path.join(dstdir, "Headers"))
if name != "opencv2":
for dirname, dirs, files in os.walk(os.path.join(dstdir, "Headers")):
for filename in files:
filepath = os.path.join(dirname, filename)
with open(filepath) as file:
body = file.read()
body = body.replace("include \"opencv2/", "include \"" + name + "/")
body = body.replace("include <opencv2/", "include <" + name + "/")
with open(filepath, "w") as file:
file.write(body)
if self.build_objc_wrapper:
copy_tree(os.path.join(builddirs[0], "install", "lib", name + ".framework", "Headers"), os.path.join(dstdir, "Headers"))
platform_name_map = {
"arm": "armv7-apple-ios",
"arm64": "arm64-apple-ios",
"i386": "i386-apple-ios-simulator",
"x86_64": "x86_64-apple-ios-simulator",
} if builddirs[0].find("iphone") != -1 else {
"x86_64": "x86_64-apple-macos",
"arm64": "arm64-apple-macos",
}
for d in builddirs:
copy_tree(os.path.join(d, "install", "lib", name + ".framework", "Modules"), os.path.join(dstdir, "Modules"))
for dirname, dirs, files in os.walk(os.path.join(dstdir, "Modules")):
for filename in files:
filestem = os.path.splitext(filename)[0]
fileext = os.path.splitext(filename)[1]
if filestem in platform_name_map:
os.rename(os.path.join(dirname, filename), os.path.join(dirname, platform_name_map[filestem] + fileext))
# make universal static lib
if self.dynamic:
libs = [os.path.join(d, "install", "lib", name + ".framework", name) for d in builddirs]
else:
libs = [os.path.join(d, "lib", self.getConfiguration(), "libopencv_merged.a") for d in builddirs]
lipocmd = ["lipo", "-create"]
lipocmd.extend(libs)
lipocmd.extend(["-o", os.path.join(dstdir, name)])
print("Creating universal library from:\n\t%s" % "\n\t".join(libs), file=sys.stderr)
execute(lipocmd)
# dynamic framework has different structure, just copy the Plist directly
if self.dynamic:
resdir = dstdir
shutil.copyfile(self.getInfoPlist(builddirs), os.path.join(resdir, "Info.plist"))
else:
# copy Info.plist
resdir = os.path.join(dstdir, "Resources")
os.makedirs(resdir)
shutil.copyfile(self.getInfoPlist(builddirs), os.path.join(resdir, "Info.plist"))
# make symbolic links
links = [
(["A"], ["Versions", "Current"]),
(["Versions", "Current", "Headers"], ["Headers"]),
(["Versions", "Current", "Resources"], ["Resources"]),
(["Versions", "Current", "Modules"], ["Modules"]),
(["Versions", "Current", name], [name])
]
for l in links:
s = os.path.join(*l[0])
d = os.path.join(framework_dir, *l[1])
os.symlink(s, d)
def copy_samples(self, outdir):
return
class iOSBuilder(Builder):
def getToolchain(self, arch, target):
toolchain = os.path.join(self.opencv, "platforms", "ios", "cmake", "Toolchains", "Toolchain-%s_Xcode.cmake" % target)
return toolchain
def getCMakeArgs(self, arch, target):
args = Builder.getCMakeArgs(self, arch, target)
args = args + [
'-DIOS_ARCH=%s' % arch
]
return args
def copy_samples(self, outdir):
print('Copying samples to: ' + outdir)
samples_dir = os.path.join(outdir, "samples")
shutil.copytree(os.path.join(self.opencv, "samples", "swift", "ios"), samples_dir)
if self.framework_name != "OpenCV":
for dirname, dirs, files in os.walk(samples_dir):
for filename in files:
if not filename.endswith((".h", ".swift", ".pbxproj")):
continue
filepath = os.path.join(dirname, filename)
with open(filepath) as file:
body = file.read()
body = body.replace("import OpenCV", "import " + self.framework_name)
body = body.replace("#import <OpenCV/OpenCV.h>", "#import <" + self.framework_name + "/" + self.framework_name + ".h>")
body = body.replace("OpenCV.framework", self.framework_name + ".framework")
body = body.replace("../../OpenCV/**", "../../" + self.framework_name + "/**")
with open(filepath, "w") as file:
file.write(body)
if __name__ == "__main__":
folder = os.path.abspath(os.path.join(os.path.dirname(sys.argv[0]), "../.."))
parser = argparse.ArgumentParser(description='The script builds OpenCV.framework for iOS.')
parser.add_argument('out', metavar='OUTDIR', help='folder to put built framework')
parser.add_argument('--opencv', metavar='DIR', default=folder, help='folder with opencv repository (default is "../.." relative to script location)')
parser.add_argument('--contrib', metavar='DIR', default=None, help='folder with opencv_contrib repository (default is "None" - build only main framework)')
parser.add_argument('--without', metavar='MODULE', default=[], action='append', help='OpenCV modules to exclude from the framework')
parser.add_argument('--disable', metavar='FEATURE', default=[], action='append', help='OpenCV features to disable (add WITH_*=OFF)')
parser.add_argument('--dynamic', default=False, action='store_true', help='build dynamic framework (default is "False" - builds static framework)')
parser.add_argument('--disable-bitcode', default=False, dest='bitcodedisabled', action='store_true', help='disable bitcode (enabled by default)')
parser.add_argument('--iphoneos_deployment_target', default=os.environ.get('IPHONEOS_DEPLOYMENT_TARGET', IPHONEOS_DEPLOYMENT_TARGET), help='specify IPHONEOS_DEPLOYMENT_TARGET')
parser.add_argument('--iphoneos_archs', default='armv7,armv7s,arm64', help='select iPhoneOS target ARCHS')
parser.add_argument('--iphonesimulator_archs', default='i386,x86_64', help='select iPhoneSimulator target ARCHS')
parser.add_argument('--enable_nonfree', default=False, dest='enablenonfree', action='store_true', help='enable non-free modules (disabled by default)')
parser.add_argument('--debug', default=False, dest='debug', action='store_true', help='Build "Debug" binaries (disabled by default)')
parser.add_argument('--debug_info', default=False, dest='debug_info', action='store_true', help='Build with debug information (useful for Release mode: BUILD_WITH_DEBUG_INFO=ON)')
parser.add_argument('--framework_name', default='opencv2', dest='framework_name', help='Name of OpenCV framework (default: opencv2, will change to OpenCV in future version)')
parser.add_argument('--legacy_build', default=False, dest='legacy_build', action='store_true', help='Build legacy opencv2 framework (default: False, equivalent to "--framework_name=opencv2 --without=objc")')
parser.add_argument('--run_tests', default=False, dest='run_tests', action='store_true', help='Run tests')
parser.add_argument('--build_docs', default=False, dest='build_docs', action='store_true', help='Build docs')
args = parser.parse_args()
os.environ['IPHONEOS_DEPLOYMENT_TARGET'] = args.iphoneos_deployment_target
print('Using IPHONEOS_DEPLOYMENT_TARGET=' + os.environ['IPHONEOS_DEPLOYMENT_TARGET'])
iphoneos_archs = args.iphoneos_archs.split(',')
print('Using iPhoneOS ARCHS=' + str(iphoneos_archs))
iphonesimulator_archs = args.iphonesimulator_archs.split(',')
print('Using iPhoneSimulator ARCHS=' + str(iphonesimulator_archs))
if args.legacy_build:
args.framework_name = "opencv2"
if not "objc" in args.without:
args.without.append("objc")
b = iOSBuilder(args.opencv, args.contrib, args.dynamic, args.bitcodedisabled, args.without, args.disable, args.enablenonfree,
[
(iphoneos_archs, "iPhoneOS"),
] if os.environ.get('BUILD_PRECOMMIT', None) else
[
(iphoneos_archs, "iPhoneOS"),
(iphonesimulator_archs, "iPhoneSimulator"),
], args.debug, args.debug_info, args.framework_name, args.run_tests, args.build_docs)
b.build(args.out)