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update documentation for Ubuntu build (#2825)

Summary:
*Description*: updating Ubuntu build documentation with llvm-8 as tested on CI
*Testing*: CI
Pull Request resolved: #2825

Differential Revision: D15350270

Pulled By: bertmaher

fbshipit-source-id: 06027467e8243ed11d61de5c6796c8aab1ac8567
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mortzur authored and facebook-github-bot committed May 15, 2019
1 parent 204e71e commit 079b4b4e0c1c80d4cd8aef4f6f560364299f0237
Showing with 6 additions and 4 deletions.
  1. +6 −4 README.md
@@ -122,19 +122,21 @@ In order to build Glow on Ubuntu it is necessary to install a few packages. The
following command should install the required dependencies:

```bash
sudo apt-get install clang clang-6.0 cmake graphviz libpng-dev \
libprotobuf-dev llvm-6.0 ninja-build protobuf-compiler wget \
sudo apt-get install clang clang-8 cmake graphviz libpng-dev \
libprotobuf-dev llvm-8 llvm-8-dev ninja-build protobuf-compiler wget \
opencl-headers libgoogle-glog-dev
```
[Note: building Glow on Ubuntu 16.04 with llvm-7 fails because llvm-7 xenial distribution
uses an older c++ ABI]

It may be desirable to use `update-alternatives` to manage the version of
clang/clang++:

```bash
sudo update-alternatives --install /usr/bin/clang clang \
/usr/lib/llvm-6.0/bin/clang 50
/usr/lib/llvm-8/bin/clang 50
sudo update-alternatives --install /usr/bin/clang++ clang++ \
/usr/lib/llvm-6.0/bin/clang++ 50
/usr/lib/llvm-8/bin/clang++ 50
```

Glow uses the system default C/C++ compiler (/usr/bin/c++), and so you may also

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