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Some changes to Readme.md

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`rustup override set nightly` is not needed, because there is a `rust-toolchain` file.

cc #165
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bjorn3 2018-11-17 12:24:35 +01:00 committed by GitHub
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@ -22,7 +22,7 @@ $ rustc -Zcodegen-backend=$(pwd)/target/debug/librustc_codegen_cranelift.so my_c
## Build sysroot and test
```bash
$ rustup component add rust-src # Make sure the sysroot source is availablr
$ rustup component add rust-src # Make sure the sysroot source is available
$ ./prepare_libcore.sh # Patch the sysroot source for some not yet supported things
$ ./build.sh
```
@ -36,3 +36,13 @@ $ ./build.sh
* libstd (needs varargs and some other stuff) ([tracked here](https://github.com/bjorn3/rustc_codegen_cranelift/issues/146))
* u128 and i128 ([no cranelift support](https://github.com/CraneStation/cranelift/issues/354))
* SIMD (huge amount of work to get all intrinsics implemented, so may never be supported)
## Troubleshooting
### Can't compile
Try updating your nightly compiler. You can try to use an nightly a day or two older if updating rustc doesn't fix it. If you still can't compile it, please fill an issue.
### error[E0463]: can't find crate for `std` while compiling a no_std crate
If you use `RUSTFLAGS` to pass `-Zcodegen-backend` to rustc, cargo will compile `build-dependencies` with those flags too. Because this project doesn't support libstd yet, that will result in an error. I don't know of any way to fix this. :(