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Update LibAFL_CC README.md (#1483)

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Updated with steps to compile LLVM from source tree
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kiwids 2023-08-29 11:09:28 -05:00 committed by GitHub
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@ -6,3 +6,26 @@ The online documentation for this crate is available [here](https://docs.rs/crat
Currently, we support LLVM version 11 up to 18, but other versions may work.
To install LLVM, use the official [download page](https://releases.llvm.org/download.html).
The LLVM tools (including clang, clang++) are needed (newer than LLVM 11.0.0 up to LLVM 17.0.0)
- When compiling LLVM tools on Windows, you can try to compile LLVM with the below commands (tested on LLVM 16.0.6).
- NOTE: This assumes you have Visual Studio 17 2022 and MSVC v143 Tools installed under "Individual Components"
```sh
## Start x64 Native Tools Command Prompt for VS 2022
RUN AS ADMINISTRATOR: %comspec% /k "C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Auxiliary\Build\vcvars64.bat"
## Cloning the LLVM project repo
git clone https://github.com/llvm/llvm-project.git llvm
## Building Clang project first, the CMAKE_INSTALL_PREFIX is important here, make sure to select a folder path that doesn't contain any spaces in it
$ cmake -S llvm\llvm -B build -DLLVM_ENABLE_PROJECTS=clang -DLLVM_TARGETS_TO_BUILD=X86 -Thost=x64 -DCMAKE_INSTALL_PREFIX=C:\llvm
$ cd build
$ cmake --build . --target install --config release
## Building lld project first, the CMAKE_INSTALL_PREFIX is important here, make sure to select a folder path that doesn't contain any spaces in it
## Changing back to the previous directory
$ cd ..
$ cmake -S llvm\llvm -B build -DLLVM_ENABLE_PROJECTS=lld -DLLVM_TARGETS_TO_BUILD=X86 -Thost=x64 -DCMAKE_INSTALL_PREFIX=C:\llvm
$ cd build
$ cmake --build . --target install --config release
```