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Update macOS installation instructions

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Richard Feldman 2021-06-07 21:51:28 -04:00
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BUILDING_FROM_SOURCE.md
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@ -54,13 +54,15 @@ If you want to install it manually, you can also download Zig directly [here](ht
### LLVM ### LLVM
**version: 12.0.x** **version: 12.0.x**
For macOS, you can install LLVM 12 using `brew install llvm@12` and then adding
`/usr/local/opt/llvm/bin` to your `PATH`. You can confirm this worked by
running `llc --version` - it should mention "LLVM version 12.0.0" at the top.
For Ubuntu and Debian, you can use the `Automatic installation script` at [apt.llvm.org](https://apt.llvm.org): For Ubuntu and Debian, you can use the `Automatic installation script` at [apt.llvm.org](https://apt.llvm.org):
``` ```
sudo bash -c "$(wget -O - https://apt.llvm.org/llvm.sh)" sudo bash -c "$(wget -O - https://apt.llvm.org/llvm.sh)"
``` ```
For macOS, check the troubleshooting section below.
There are also plenty of alternative options at http://releases.llvm.org/download.html There are also plenty of alternative options at http://releases.llvm.org/download.html
## Using Nix ## Using Nix
@ -143,31 +145,15 @@ If you encounter `cannot find -lz` run `sudo apt install zlib1g-dev`.
### LLVM installation on macOS ### LLVM installation on macOS
By default homebrew will try to install llvm 11, which is currently If installing LLVM fails, it might help to run `sudo xcode-select -r` before installing again.
unsupported. You need to install an older version (10.0.0_3) by doing:
```
$ brew edit llvm
# Replace the contents of the file with https://raw.githubusercontent.com/Homebrew/homebrew-core/6616d50fb0b24dbe30f5e975210bdad63257f517/Formula/llvm.rb
# we expect llvm-as-10 to be present
$ ln -s /usr/local/opt/llvm/bin/{llvm-as,llvm-as-10}
# "pinning" ensures that homebrew doesn't update it automatically
$ brew pin llvm
```
It might also be useful to add these exports to your shell: It might also be useful to add these exports to your shell:
``` ```
export PATH="/usr/local/opt/llvm/bin:$PATH"
export LDFLAGS="-L/usr/local/opt/llvm/lib -Wl,-rpath,/usr/local/opt/llvm/lib" export LDFLAGS="-L/usr/local/opt/llvm/lib -Wl,-rpath,/usr/local/opt/llvm/lib"
export CPPFLAGS="-I/usr/local/opt/llvm/include" export CPPFLAGS="-I/usr/local/opt/llvm/include"
``` ```
If installing LLVM still fails, it might help to run `sudo xcode-select -r` before installing again.
### LLVM installation on Windows ### LLVM installation on Windows
Installing LLVM's prebuilt binaries doesn't seem to be enough for the `llvm-sys` crate that Roc depends on, so I had to build LLVM from source Installing LLVM's prebuilt binaries doesn't seem to be enough for the `llvm-sys` crate that Roc depends on, so I had to build LLVM from source