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https://gitee.com/openharmony/third_party_rust_link-cplusplus
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80 lines
2.6 KiB
Markdown
80 lines
2.6 KiB
Markdown
`-lstdc++` or `-lc++`
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=====================
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[<img alt="github" src="https://img.shields.io/badge/github-dtolnay/link--cplusplus-8da0cb?style=for-the-badge&labelColor=555555&logo=github" height="20">](https://github.com/dtolnay/link-cplusplus)
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[<img alt="crates.io" src="https://img.shields.io/crates/v/link-cplusplus.svg?style=for-the-badge&color=fc8d62&logo=rust" height="20">](https://crates.io/crates/link-cplusplus)
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[<img alt="docs.rs" src="https://img.shields.io/badge/docs.rs-link--cplusplus-66c2a5?style=for-the-badge&labelColor=555555&logo=docs.rs" height="20">](https://docs.rs/link-cplusplus)
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[<img alt="build status" src="https://img.shields.io/github/actions/workflow/status/dtolnay/link-cplusplus/ci.yml?branch=master&style=for-the-badge" height="20">](https://github.com/dtolnay/link-cplusplus/actions?query=branch%3Amaster)
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This crate exists for the purpose of passing `-lstdc++` or `-lc++` to the
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linker, while making it possible for an application to make that choice on
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behalf of its library dependencies.
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Without this crate, a library would need to:
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- pick one or the other to link, with no way for downstream applications to
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override the choice;
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- or link neither and require an explicit link flag provided by downstream
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applications even if they would be fine with a default choice;
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neither of which are good experiences.
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<br>
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## Options
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An application or library that is fine with either of libstdc++ or libc++ being
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linked, whichever is the platform's default, should use the following in
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Cargo.toml:
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```toml
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[dependencies]
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link-cplusplus = "1.0"
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```
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An application that wants a particular one or the other linked should use:
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```toml
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[dependencies]
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link-cplusplus = { version = "1.0", features = ["libstdc++"] }
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# or
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link-cplusplus = { version = "1.0", features = ["libc++"] }
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```
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An application that wants to handle its own more complicated logic for link
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flags from its build script can make this crate do nothing by using:
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```toml
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[dependencies]
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link-cplusplus = { version = "1.0", features = ["nothing"] }
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```
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Lastly, make sure to add an explicit `extern crate` dependency to your crate
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root, since the link-cplusplus crate will be otherwise unused and its link flags
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dropped.
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```rust
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// src/lib.rs
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extern crate link_cplusplus;
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```
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<br>
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#### License
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<sup>
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Licensed under either of <a href="LICENSE-APACHE">Apache License, Version
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2.0</a> or <a href="LICENSE-MIT">MIT license</a> at your option.
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</sup>
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<br>
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<sub>
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Unless you explicitly state otherwise, any contribution intentionally submitted
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for inclusion in this project by you, as defined in the Apache-2.0 license,
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shall be dual licensed as above, without any additional terms or conditions.
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</sub>
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