04521fd10e
Add the unstable option to reduce the binary size of dynamic library… # Motivation The average length of symbol names in the rust standard library is about 100 bytes, while the average length of symbol names in the C++ standard library is about 65 bytes. In some embedded environments where dynamic library are widely used, rust dynamic library symbol name space hash become one of the key bottlenecks of application, Especially when the existing C/C++ module is reconstructed into the rust module. The unstable option `-Z symbol_mangling_version=hashed` is added to solve the bottleneck caused by too long dynamic library symbol names. ## Test data The following is a set of test data on the ubuntu 18.04 LTS environment. With this plug-in, the space saving rate of dynamic libraries can reach about 20%. The test object is the standard library of rust (built based on Xargo), tokio crate, and hyper crate. The contents of the Cargo.toml file in the construction project of the three dynamic libraries are as follows: ```txt # Cargo.toml [profile.release] panic = "abort" opt-leve="z" codegen-units=1 strip=true debug=true ``` The built dynamic library also removes the `.rustc` segments that are not needed at run time and then compares the size. The detailed data is as follows: 1. libstd.so > | symbol_mangling_version | size | saving rate | > | --- | --- | --- | > | legacy | 804896 || > | hashed | 608288 | 0.244 | > | v0 | 858144 || > | hashed | 608288 | 0.291 | 2. libhyper.so > | symbol_mangling_version(libhyper.so) | symbol_mangling_version(libstd.so) | size | saving rate | > | --- | --- | --- | --- | > | legacy | legacy | 866312 || > | hashed | legacy | 645128 |0.255| > | legacy | hashed | 854024 || > | hashed | hashed | 632840 |0.259| |
||
|---|---|---|
| .github | ||
| .reuse | ||
| compiler | ||
| library | ||
| LICENSES | ||
| src | ||
| tests | ||
| .editorconfig | ||
| .git-blame-ignore-revs | ||
| .gitattributes | ||
| .gitignore | ||
| .gitmodules | ||
| .mailmap | ||
| Cargo.lock | ||
| Cargo.toml | ||
| CODE_OF_CONDUCT.md | ||
| config.example.toml | ||
| configure | ||
| CONTRIBUTING.md | ||
| COPYRIGHT | ||
| INSTALL.md | ||
| LICENSE-APACHE | ||
| LICENSE-MIT | ||
| README.md | ||
| RELEASES.md | ||
| rust-bors.toml | ||
| rustfmt.toml | ||
| triagebot.toml | ||
| x | ||
| x.ps1 | ||
| x.py | ||
The Rust Programming Language
This is the main source code repository for Rust. It contains the compiler, standard library, and documentation.
Note: this README is for users rather than contributors. If you wish to contribute to the compiler, you should read CONTRIBUTING.md instead.
Table of Contents
Quick Start
Read "Installation" from The Book.
Installing from Source
If you really want to install from source (though this is not recommended), see INSTALL.md.
Getting Help
See https://www.rust-lang.org/community for a list of chat platforms and forums.
Contributing
See CONTRIBUTING.md.
License
Rust is primarily distributed under the terms of both the MIT license and the Apache License (Version 2.0), with portions covered by various BSD-like licenses.
See LICENSE-APACHE, LICENSE-MIT, and COPYRIGHT for details.
Trademark
The Rust Foundation owns and protects the Rust and Cargo trademarks and logos (the "Rust Trademarks").
If you want to use these names or brands, please read the media guide.
Third-party logos may be subject to third-party copyrights and trademarks. See Licenses for details.