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tc-build: Add initial scripts and update README
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
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# tc-build | ||
A set of scripts to build LLVM and binutils | ||
# Toolchain build scripts | ||
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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.sh` script takes it a step farther by trying to optimize both LLVM's build time by: | ||
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* 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 | ||
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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`). | ||
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## Getting started | ||
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These scripts have been tested in a Docker image of the following distributions, with the following packages installed: | ||
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* ### Debian/Ubuntu | ||
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``` | ||
apt install ca-certificates ccache clang cmake curl file gcc g++ git make ninja-build python texinfo zlib1g-dev | ||
``` | ||
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On Debian Buster or Ubuntu Bionic/Cosmic/Disco, `apt-get install lld` should be added as well for faster compiles. | ||
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* ### Fedora | ||
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``` | ||
dnf install ccache clang cmake gcc gcc-c++ git lld ninja-build python zlib-devel | ||
``` | ||
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* ### Arch Linux | ||
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``` | ||
pacman -S base-devel ccache clang cmake git lld ninja python | ||
``` | ||
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These scripts should be distribution agnostic. Please feel free to add different distribution install commands here through a pull request. | ||
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## build-llvm.sh | ||
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By default, `./build-llvm.sh` will clone LLVM, grab the latest binutils tarball (for the LLVMgold.so plugin), and build LLVM, clang, and lld. Run `./build-llvm.sh -h` for more options. | ||
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## build-binutils.sh | ||
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This script builds a standalone copy of binutils. This 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`): | ||
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``` | ||
bfd plugin: LLVM gold plugin has failed to create LTO module: Unknown attribute kind (60) (Producer: 'LLVM9.0.0svn' Reader: 'LLVM 7.0.1') | ||
``` | ||
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Having a standalone copy of binutils (ideally in the same folder at the LLVM toolchain so that 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`. | ||
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## Getting help | ||
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Please open an issue on this repo and include your distribution, shell, the command you ran, and the error output. |
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Usage: ./build-binutils.sh [options] | ||
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Description: Fetchs and builds binutils | ||
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Parameters: | ||
-I | --install-folder: | ||
By default, the script will create a "usr" folder in the same folder as this script | ||
and install binutils there. If you'd like to have it installed somewhere else, pass | ||
it to this parameter. This can either be an absolute or relative path. | ||
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For example: -I ~/binutils | ||
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-t | --target: | ||
The script can build binutils targeting arm-linux-gnueabi, aarch64-linux-gnu, | ||
powerpc-linux-gnu, powerpc64le-linux-gnu, and x86_64-linux-gnu (host if on x86_64). | ||
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You can either pass the full target or just the first part (arm, aarch64, etc) or all | ||
if you want to build all targets. | ||
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Example: -t all, -t aarch64, -t arm-linux-gnueabi |
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