harmony 鸿蒙libc++

  • 2023-10-30
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libc++

Currently, OpenHarmony uses the C++ standard library (libc++) of the LLVM project.

Version

From OpenHarmony 3.0, libc++ uses Clang/LLVM 10.0.1.

From OpenHarmony 3.2, libc++ is upgraded to Clang/LLVM 12.0.1.

From OpenHarmony 4.0, libc++ is upgraded to Clang/LLVM 15.0.4.

Supported Capabilities

The C++11 and C++14 standards are supported, and the C++17 and C++20 standards are on the way. For details about the standards supported by language features, see the corresponding Release Notes at https://libcxx.llvm.org/.

ABI Compatibility

In OpenHarmony, both the system library and application native library use the libc++. However, the two libc++ are different. The libc++ of the system library is updated with the image version, while the libc++ of the application native library is updated with the SDK version used for compilation. Both the libc++ libraries cross multiple major versions, which may cause Application Binary Interface (ABI) compatibility issues. To solve this problem, OpenHarmony differentiates the libc++ libraries as follows: * System library: uses libc++.so, which is released with the system image. * Application native library: uses libc++_shared.so, which is released with the application.

The two libc++ libraries use different namespaces. libc++_shared.so uses __n1 as the namespace for C++ symbols, and libc++.so uses __h as the namespace for C++ symbols.

CAUTION

Currently, the Native API supports C only. The system library can use any programming language.

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