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Rollup merge of #74521 - andjo403:readme, r=nikic

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older toolchains not valid anymore

with the change to llvm 10 the parameter
LLVM_TEMPORARILY_ALLOW_OLD_TOOLCHAIN do not do anything as min and soft error is the same.
see 86b120e6f3/llvm/cmake/modules/CheckCompilerVersion.cmake
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Yuki Okushi 2020-08-12 12:07:06 +09:00 committed by GitHub
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README.md
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@ -1,9 +1,9 @@
<a href = "https://www.rust-lang.org/">
<a href = "https://www.rust-lang.org/">
<img width = "90%" height = "auto" src = "https://img.shields.io/badge/Rust-Programming%20Language-black?style=flat&logo=rust" alt = "The Rust Programming Language">
</a>
This is the main source code repository for [Rust]. It contains the compiler,
standard library, and documentation.
standard library, and documentation.
[Rust]: https://www.rust-lang.org
@ -23,7 +23,7 @@ Read ["Installation"] from [The Book].
section.**
The Rust build system uses a Python script called `x.py` to build the compiler,
which manages the bootstrapping process. More information about it can be found
which manages the bootstrapping process. More information about it can be found
by running `./x.py --help` or reading the [rustc dev guide][rustcguidebuild].
[gettingstarted]: https://rustc-dev-guide.rust-lang.org/getting-started.html
@ -157,17 +157,6 @@ by manually calling the appropriate vcvars file before running the bootstrap.
> python x.py build
```
### Building rustc with older host toolchains
It is still possible to build Rust with the older toolchain versions listed below, but only if the
LLVM_TEMPORARILY_ALLOW_OLD_TOOLCHAIN option is set to true in the config.toml file.
* Clang 3.1
* Apple Clang 3.1
* GCC 4.8
* Visual Studio 2015 (Update 3)
Toolchain versions older than what is listed above cannot be used to build rustc.
#### Specifying an ABI
Each specific ABI can also be used from either environment (for example, using