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# The Ethereum EVM JIT
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EVM JIT is a library for just-in-time compilation of Ethereum EVM code.
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It can be used to substitute classic interpreter-like EVM Virtual Machine in Ethereum client.
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## Build
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### Linux / Ubuntu
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1. Install llvm-3.5-dev package
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1. For Ubuntu 14.04 using LLVM deb packages source: http://llvm.org/apt
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2. For Ubuntu 14.10 using Ubuntu packages
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2. Build library with cmake
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1. `mkdir build && cd $_`
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2. `cmake .. && make`
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3. Install library
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1. `sudo make install`
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2. `sudo ldconfig`
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### OSX
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1. Install llvm35
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1. `brew install llvm35 --disable-shared --HEAD`
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2. Build library with cmake
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1. `mkdir build && cd $_`
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2. `cmake -DLLVM_DIR=/usr/local/lib/llvm-3.5/share/llvm/cmake .. && make`
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3. Install library
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1. `make install` (with admin rights?)
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### Windows
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Ask me.
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## Options
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Options to evmjit library can be passed by environmental variables, e.g. `EVMJIT_CACHE=0 testeth --jit`.
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Option | Default value | Description
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------------- | ------------- | ----------------------------------------------
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EVMJIT_CACHE | 1 | Enables on disk cache for compiled EVM objects
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EVMJIT_DUMP | 0 | Dumps generated LLVM module to standard output
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