c36dd6a35e
Fix Python utility compatibility issues - #29755 ### Problem Several repository Python utilities emit invalid escape sequence SyntaxWarnings under Python 3.13. The Java test checker also attempts to parse non-Java assets as UTF-8, causing UnicodeDecodeError, and relies on a global parser instance. The Apple build utility accepts malformed CMake version strings because one version separator is an unescaped regex wildcard. ### Changes - Use raw strings for regular expressions and replacement templates. - Skip non-Java files in the Java test checker. - Use the current JavaParser instance instead of global state. - Require literal dots in parsed CMake versions. ### Verification - Compiled every tracked Python file with SyntaxWarning treated as an error. - Ran the Java checker against modules/java/test successfully. - Verified valid CMake versions are accepted and malformed versions rejected. - Ran git diff --check.
Building for Apple Platforms
build_xcframework.py creates an xcframework supporting a variety of Apple platforms.
You'll need the following to run these steps:
- MacOS 10.15 or later
- Python 3.6 or later
- CMake 3.18.5/3.19.0 or later (make sure the
cmakecommand is available on your PATH) - Xcode 12.2 or later (and its command line tools)
You can then run build_xcframework.py, as below:
cd ~/<my_working_directory>
python opencv/platforms/apple/build_xcframework.py --out ./build_xcframework
Grab a coffee, because you'll be here for a while. By default this builds OpenCV for 8 architectures across 4 platforms:
- iOS (
--iphoneos_archs): arm64, armv7 - iOS Simulator (
--iphonesimulator_archs): x86_64, arm64 - macOS (
--macos_archs): x86_64, arm64 - Mac Catalyst (
--catalyst_archs): x86_64, arm64
If everything's fine, you will eventually get opencv2.xcframework in the output directory.
The script has some configuration options to exclude platforms and architectures you don't want to build for. Use the --help flag for more information.
How it Works
This script generates a fat .framework for each platform you specify, and stitches them together into a .xcframework. This file can be used to support the same architecture on different platforms, which fat .frameworks don't allow. To build the intermediate .frameworks, build_xcframework.py leverages the build_framework.py scripts in the ios and osx platform folders.
Passthrough Arguments
Any arguments that aren't recognized by build_xcframework.py will be passed to the platform-specific build_framework.py scripts. The --without flag mentioned in the examples is an example of this in action. For more info, see the --help info for those scripts.
Examples
You may override the defaults by specifying a value for any of the *_archs flags. For example, if you want to build for arm64 on every platform, you can do this:
python build_xcframework.py --out somedir --iphoneos_archs arm64 --iphonesimulator_archs arm64 --macos_archs arm64 --catalyst_archs arm64
If you want to build only for certain platforms, you can supply the --build_only_specified_archs flag, which makes the script build only the archs you directly ask for. For example, to build only for Catalyst, you can do this:
python build_xcframework.py --out somedir --catalyst_archs x86_64,arm64 --build_only_specified_archs
You can also build without OpenCV functionality you don't need. You can do this by using the --without flag, which you use once per item you want to go without. For example, if you wanted to compile without video or objc, you'd can do this:
python build_xcframework.py --out somedir --without video --without objc
(if you have issues with this, try using =, e.g. --without=video --without=objc, and file an issue on GitHub.)