tc-build: Python rewrite

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Something isn't working properly
+title: ''
+label: ''
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Go to '...'
+2. Click on '....'
+3. Scroll down to '....'
+4. See error
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Environment (please complete the following information):**
+  - Command you ran: [e.g. `./build-llvm.py`]
+  - Distribution: [e.g. Debian stretch or Arch Linux]
+  - Python version: [e.g. 3.7.3]
+  - Shell: [e.g. zsh]

.gitignore

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+/.idea/
+/venv/
+*.pyc
+llvm-project/
+build/

LICENSE

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README.md

@@ -1,2 +1,61 @@
-# tc-build
-A set of scripts to build LLVM and binutils
+# Toolchain build scripts
+
+There are times where a tip of tree LLVM build will have some issue fixed and it isn't available to you, maybe because it isn't in a release or it isn't available through your distribution's package management system. At that point, to get that fix, LLVM needs to be compiled, which sounds scary but is [rather simple](https://llvm.org/docs/GettingStarted.html). The `build-llvm.py` script takes it a step farther by trying to optimize both LLVM's build time by:
+
+* Trimming down a lot of things that kernel developers don't care about:
+  * Documentation
+  * LLVM tests
+  * Ocaml bindings
+  * libfuzzer
+* Building with the faster tools available (in order of fastest to slowest):
+  * clang + lld
+  * clang/gcc + ld.gold
+  * clang/gcc + ld.bfd
+
+It also aims to make kernel compilation go a little bit faster by generating a toolchain that is optimized for the host CPU (using `-O2 -march=native -mtune=native`).
+
+## Getting started
+
+These scripts have been tested in a Docker image of the following distributions, with the following packages installed:
+
+* ### Debian/Ubuntu
+
+  ```
+  apt install ca-certificates ccache clang cmake curl file gcc g++ git make ninja-build python3 texinfo zlib1g-dev
+  ```
+
+  On Debian Buster or Ubuntu Bionic/Cosmic/Disco, `apt install lld` should be added as well for faster compiles.
+
+* ### Fedora
+
+  ```
+  dnf install ccache clang cmake gcc gcc-c++ git lld make ninja-build python3 zlib-devel
+  ```
+
+* ### Arch Linux
+
+  ```
+  pacman -S base-devel ccache clang cmake git lld ninja python3
+  ```
+
+Python 3.5.3+ is recommended, as that is what the script has been tested against. These scripts should be distribution agnostic. Please feel free to add different distribution install commands here through a pull request.
+
+## build-llvm.py
+
+By default, `./build-llvm.py` will clone LLVM, grab the latest binutils tarball (for the LLVMgold.so plugin), and build LLVM, clang, and lld, and install them into `build`. Run `./build-llvm.py -h` for more options.
+
+## build-binutils.py
+
+This script builds a standalone copy of binutils. By default, `./build-binutils.py` will download binutils 2.32, build for all architectures we currently care about (arm32, aarch64, powerpc32, powerpc64le, and x86_64), and install them into `build`. Run `./build-binutils.py -h` for more options.
+
+Building a standalone copy of binutils might be needed because certain distributions like Arch Linux (whose options the script uses) might symlink `/usr/lib/LLVMgold.so` to `/usr/lib/bfd-plugins` ([source](https://bugs.archlinux.org/task/28479)), which can cause issues when using the system's linker for LTO (even with `LD_LIBRARY_PATH`):
+
+```
+bfd plugin: LLVM gold plugin has failed to create LTO module: Unknown attribute kind (60) (Producer: 'LLVM9.0.0svn' Reader: 'LLVM 7.0.1')
+```
+
+Having a standalone copy of binutils (ideally in the same folder at the LLVM toolchain so that only one `PATH` modification is needed) works around this without any adverse side effects. Another workaround is bind mounting the new `LLVMgold.so` to `/usr/lib/LLVMgold.so`.
+
+## Getting help
+
+Please open an issue on this repo and include your distribution, shell, the command you ran, and the error output.