11

运行时cargo build：

error: multiple matching crates for `url`

然后列出候选人：

  • ./target/deps/liburl-11a95471847b9e04.rlib
  • /usr/local/lib/rustlib/x86_64-unknown-linux-gnu/lib/liburl-4e7c5e5c.{so,rlib}

...然后中止，因为它无法决定哪一个。

src/http/lib.rs:18:1: 18:18 error: can't find crate for `url`
src/http/lib.rs:18 extern crate url;
                   ^~~~~~~~~~~~~~~~~
error: aborting due to 2 previous errors

如何解决此问题或解决此问题？

笔记：

这个问题 和这个提交 似乎与问题有关，来自评论：

+//! rust-url’s crate is also named `url`.
+//! Cargo will automatically resolve the name conflict,
+//! but that means that you can not also use the old `url` in the same crate.

安装细节：

$ rustc -v
rustc 0.12.0-pre-nightly (7a25cf3f3 2014-07-30 17:06:18 +0000)
$ cargo -V
0.0.1-pre-nightly (4a69ffa 2014-07-29 21:30:40 +0000)

Cargo.toml：

[package]

name = "nickel-demo"
version = "0.1.0"
authors = [ "your-name@gmail.com" ]

[[bin]]

name = "nickel-demo"
path = "src/main.rs"

[dependencies.nickel]

git = "https://github.com/nickel-org/nickel.rs.git"

[dependencies.rust-postgres]

git = "https://github.com/sfackler/rust-postgres.git"

（从http://nickel.rs/getting-started.html复制并添加了一个额外的依赖项）

我得到的完整错误是：

   Compiling rust-postgres v0.0.0 (https://github.com/sfackler/rust-postgres.git#7d842441)
Build failed, waiting for other jobs to finish...
Could not compile `rust-postgres`.

--- stderr
src/lib.rs:70:1: 70:18 error: multiple matching crates for `url`
src/lib.rs:70 extern crate url;
              ^~~~~~~~~~~~~~~~~
note: candidates:
note: path: /usr/local/lib/rustlib/x86_64-unknown-linux-gnu/lib/liburl-4e7c5e5c.so
note: path: /usr/local/lib/rustlib/x86_64-unknown-linux-gnu/lib/liburl-4e7c5e5c.rlib
note: crate name: url
note: path: /home/bojangle/k/nickel-demo/target/deps/liburl-11a95471847b9e04.rlib
note: crate name: url
src/lib.rs:70:1: 70:18 error: can't find crate for `url`
src/lib.rs:70 extern crate url;
              ^~~~~~~~~~~~~~~~~
error: aborting due to 2 previous errors


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4

1 回答 1

1

现在（今天的 Cargo 版本）在获取包时也会出现这个错误：

native library `openssl` is being linked to by more than one package, and can only be linked to by one package

  openssl-sys v0.2.13 (https://github.com/sfackler/rust-openssl.git#2f5d1e57)
  openssl-sys v0.2.15

在这两种情况下，您所能做的就是通过Cargo.toml在克隆的 rustlib 或镍（或在 openssl-sys 情况下的 curl-rust ）中更改它们的权利，将您的一个依赖项重新指向相同的传递依赖项，然后将您Cargo.toml重新指向更改后的依赖项：http：/ /doc.crates.io/build-script.html#overriding-build-scripts，所以它只是你的 .cargo/config 中的一行： 

 paths = ["/path/to/overridden/dependency"]

/path/to/overridden/dependency/Cargo.toml 中的类似内容：

 [dependencies]
 transitive-dependency-name = "choosed-version"

你可以把它指向这里的 git。

更多关于多链接问题：https ://github.com/rust-lang/cargo/issues/886

于 2015-01-11T07:35:46.027 回答