Clang-tools-extra Doxygen (.tar.xz) Pre-Built Binaries: These binaries include Clang, LLD, compiler-rt, various LLVM tools, etc. Varying slightly between platforms. Clang Static Analyzer. The Clang Static Analyzer is a source code analysis tool that finds bugs in C, C, and Objective-C programs. Currently it can be run either from the command line or if you use macOS then within Xcode.
macOS (previously known as OS X or Mac OS X) is Apple's operating system for the Mac line of computers. It's a UNIX platform, based on the Darwin kernel, and behaves largely similar to other UNIX-like platforms. The main difference is that X11 is not used as the windowing system. Instead, macOS uses its own native windowing system that is accessible through the Cocoa API.
To download and install Qt for macOS, follow the instructions on the Getting Started with Qt page.
Supported Versions
When talking about version support on macOS, it's important to distinguish between the build environment; the platform you're building on or with, and the target platforms; the platforms you are building for. The following macOS versions are supported.
| Target Platform | Architecture | Build Environment |
|---|---|---|
| macOS 10.13, 10.14, 10.15 | x86_64 and x86_64h | Xcode 11 (10.15 SDK) |
Build Environment
The build environment on macOS is defined entirely by the Xcode version used to build your application. Xcode contains both a toolchain (compiler, linker, and other tools), and a macOS platform-SDK (headers and libraries). Together these define how your application is built.
Note: The version of macOS that you are running Xcode on does not matter. As long as Apple ships a given Xcode version that runs on your operating system, the build environment will be defined by that Xcode version.
Xcode can be downloaded from Apple's developer website (including older versions of Xcode). Once installed, choosing an Xcode installation is done using the xcode-select tool.
You can inspect the globally selected Xcode installation using the same tool.
The xcrun command can then be used to find a particular tool in the toolchain.
or show the platform SDK path used when building.
Target Platforms
Building for macOS utilizes a technique called weak linking that allows you to build your application against the headers and libraries of the latest platform SDK, while still allowing your application to be deployed to macOS versions lower than the SDK version. When the binary is run on a macOS version lower than the SDK it was built with, Qt will check at runtime whether or not a platform feature is available before utilizing it.
In theory this would allow running your application on every single macOS version released, but for practical (and technical) reasons there is a lower limit to this range, known as the deployment target of your application. If the binary is launched on a macOS version below the deployment target macOS or Qt will give an error message and the application will not run.
Qt expresses the deployment target via the QMAKE_MACOSX_DEPLOYMENT_TARGET qmake variable, which has a default value set via the makespec for macOS. You should not need to change this default, but if needed you can increase it in your project file:
Note: You should not lower the deployment target beyond the default value set by Qt. Doing so will likely lead to crashes at runtime if the binary is then deployed to a macOS version lower than what Qt expected to run on.
By always building against the latest available platform SDK, you ensure that Qt can take advantage of new features introduced in recent versions of macOS.
For more information about SDK-based development on macOS, see Apple's developer documentation.
Opting out of macOS behavior changes
One caveat to using the latest Xcode version and SDK to build your application is that macOS's system frameworks will sometimes decide whether or not to enable behavior changes based on the SDK you built your application with.
For example, when dark-mode was introduced in macOS 10.14 Mojave, macOS would only treat applications built against the 10.14 SDK as supporting dark-mode, and would leave applications built against earlier SDKs with the default light mode look. This technique allows Apple to ensure that binaries built long before the new SDK and operating system was released will still continue to run without regressions on new macOS releases.
A consequence of this is that if Qt has problems dealing with some of these macOS features (dark-mode, layer-backed views), the only way to opt out of them is building with an earlier SDK (the 10.13 SDK, available through Xcode 9). This is a last-resort solution, and should only be applied if your application has no other ways of working around the problem.
Architectures
By default, Qt is built for x86_64. To build for x86_64h (Haswell). use the QMAKE_APPLE_DEVICE_ARCHSqmake variable. This is selectable at configure time:
QMAKE_APPLE_DEVICE_ARCHS can also be specified as a space-delimited list in order to build for multiple architectures simultaneously:
Additional Command-Line Options
On the command-line, applications can be built using qmake and make. Optionally, qmake can generate project files for Xcode with -spec macx-xcode. If you are using the binary package, qmake generates Xcode projects by default; use -spec macx-gcc to generate makefiles. For example:
Configuring with -spec macx-xcode generates an Xcode project file from project.pro. With qmake you do not have to worry about rules for Qt's preprocessors (moc and uic) since qmake automatically handles them and ensures that everything necessary is linked into your application.
Qt does not entirely interact with the development environment (for example plugins to set a file to 'mocable' from within the Xcode user interface).
The result of the build process is an application bundle, which is a directory structure that contains the actual application executable. The application can be launched by double-clicking it in Finder, or by referring directly to its executable from the command line, for example, myApp.app/Contents/MacOS/myApp.
If you wish to have a command-line tool that does not use the GUI for example, moc, uic or ls, you can tell qmake to disable bundle creation from the CONFIG variable in the project file:
Deploying Applications on macOS
macOS applications are typically deployed as self-contained application bundles. The application bundle contains the application executable as well as dependencies such as the Qt libraries, plugins, translations and other resources you may need. Third party libraries like Qt are normally not installed system-wide; each application provides its own copy.
A common way to distribute applications is to provide a compressed disk image (.dmg file) that the user can mount in Finder. The deployment tool, macdeployqt (available from the macOS installers), can be used to create the self-contained bundles, and optionally also create a .dmg archive. Applications can also be distributed through the Mac App Store. Qt 5 aims to stay within the app store sandbox rules. macdeployqt (bin/macdeployqt) can be used as a starting point for app store deployment.
Note: For selling applications in the macOS App Store, special rules apply. In order to pass validation, the application must verify the existence of a valid receipt before executing any code. Since this is a copy protection mechanism, steps should be taken to avoid common patterns and obfuscate the code that validates the receipt as much as possible. Thus, this cannot be automated by Qt, but requires some platform-specific code written specifically for the application itself. More information can be found in Apple's documentation.
macOS Issues
Dcs world mac download. The page below covers specific issues and recommendations for creating macOS applications.
Where to Go from Here
We invite you to explore the rest of Qt. We prepared overviews to help you decide which APIs to use and our examples demonstrate how to use our API.
- Qt Overviews - list of topics about application development
- Examples and Tutorials - code samples and tutorials
- Qt Reference Pages - a listing of C++ and QML APIs
Qt's vibrant and active community site, http://qt.io houses a wiki, a forum, and additional learning guides and presentations.
© 2020 The Qt Company Ltd. Documentation contributions included herein are the copyrights of their respective owners. The documentation provided herein is licensed under the terms of the GNU Free Documentation License version 1.3 as published by the Free Software Foundation. Qt and respective logos are trademarks of The Qt Company Ltd. in Finland and/or other countries worldwide. All other trademarks are property of their respective owners.
libc++ is an implementation of the C++ standard library, targeting C++11, C++14 and above.
All of the code in libc++ is dual licensed under the MIT license and the UIUC License (a BSD-like license).
New Documentation Coming Soon!
Looking for documentation on how to use, build and test libc++? If so checkout the new libc++ documentation.
Features and Goals
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- Correctness as defined by the C++11 standard.
- Fast execution.
- Minimal memory use.
- Fast compile times.
- ABI compatibility with gcc's libstdc++ for some low-level features such as exception objects, rtti and memory allocation.
- Extensive unit tests.
Why a new C++ Standard Library for C++11?
After its initial introduction, many people have asked 'why start a new library instead of contributing to an existing library?' (like Apache's libstdcxx, GNU's libstdc++, STLport, etc). There are many contributing reasons, but some of the major ones are:
From years of experience (including having implemented the standard library before), we've learned many things about implementing the standard containers which require ABI breakage and fundamental changes to how they are implemented. For example, it is generally accepted that building std::string using the 'short string optimization' instead of using Copy On Write (COW) is a superior approach for multicore machines (particularly in C++11, which has rvalue references). Breaking ABI compatibility with old versions of the library was determined to be critical to achieving the performance goals of libc++.
Mainline libstdc++ has switched to GPL3, a license which the developers of libc++ cannot use. libstdc++ 4.2 (the last GPL2 version) could be independently extended to support C++11, but this would be a fork of the codebase (which is often seen as worse for a project than starting a new independent one). Another problem with libstdc++ is that it is tightly integrated with G++ development, tending to be tied fairly closely to the matching version of G++.
STLport and the Apache libstdcxx library are two other popular candidates, but both lack C++11 support. Our experience (and the experience of libstdc++ developers) is that adding support for C++11 (in particular rvalue references and move-only types) requires changes to almost every class and function, essentially amounting to a rewrite. Faced with a rewrite, we decided to start from scratch and evaluate every design decision from first principles based on experience.
Further, both projects are apparently abandoned: STLport 5.2.1 was released in Oct'08, and STDCXX 4.2.1 in May'08.
Platform Support
libc++ is known to work on the following platforms, using g++ and clang. Note that functionality provided by <atomic> is only functional with clang.
- Mac OS X i386
- Mac OS X x86_64
- FreeBSD 10+ i386
- FreeBSD 10+ x86_64
- FreeBSD 10+ ARM
- Linux i386
- Linux x86_64
Current Status
libc++ is a 100% complete C++11 implementation on Apple's OS X.
LLVM and Clang can self host in C++ and C++11 mode with libc++ on Linux.
libc++ is also a 100% complete C++14 implementation. A list of new features and changes for C++14 can be found here.
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libc++'s C++17 implementation is not yet complete. A list of features and changes for C++17 can be found here.
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A list of features and changes for the next C++ standard, known here as 'C++2a' (probably to be C++20) can be found here.
Implementation of the post-C++14 Technical Specifications is in progress. A list of features and the current status of these features can be found here.
As features get moved from the Technical Specifications into the main standard, we will (after a period for migration) remove them from the TS implementation. This process is detailed here.
Build Bots
The latest libc++ build results can be found at the following locations.
Get it and get involved!
First please review our Developer's Policy. The documentation for building and using libc++ can be found below.
- Using libc++ Documentation on using the library in your programs
- Building libc++ Documentation on building the library using CMake
- Testing libc++ Documentation for developers wishing to test the library
Notes and Known Issues
- Building libc++ with
-fno-rttiis not supported. However linking against it with-fno-rttiis supported.
Send discussions to the libc++ mailing list.
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Bug reports and patches
If you think you've found a bug in libc++, please report it using the LLVM Bugzilla. If you're not sure, you can post a message to the libcxx-dev mailing list or on IRC.
If you want to contribute a patch to libc++, the best place for that is Phabricator. Please add libcxx-commits as a subscriber.
Design Documents