47 lines
1.7 KiB
Markdown
47 lines
1.7 KiB
Markdown
# Ethereum smart contracts in Nim
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Disclaimer: WIP
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This is a sample of how building eWASM contracts in Nim is possible.
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Requirements:
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* clang 7.0 or later with WebAssembly support. Most likely has to be built manually.
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* 32bit version of libc. On linuxes it is usually provided by the package manager.
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* `wasm2wat` and `wat2wasm` from [wabt (WebAssembly binary toolkit)](https://github.com/WebAssembly/wabt). They need to be in the `PATH`.
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* [optional] [wasm-gc](https://github.com/alexcrichton/wasm-gc) optimizer
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## Compiling examples
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```
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export WASM_LLVM_BIN=/path/to/llvm/bin/folder
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nimble examples
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```
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## Troubleshooting
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* **Emscripten doesn't work!** It is not expected to. Use clang with wasm target enabled.
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* **clang is difficult to build.** No, it's easy. Follow these steps:
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```
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tag=release_70
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INSTALL_PREFIX=$(pwd)/llvm-wasm
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git clone --depth 1 --branch $tag https://github.com/llvm-mirror/llvm.git
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cd llvm/tools
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git clone --depth 1 --branch $tag https://github.com/llvm-mirror/clang
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git clone --depth 1 --branch $tag https://github.com/llvm-mirror/lld
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cd ..
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mkdir build
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cd build
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cmake -G "Unix Makefiles" -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=$INSTALL_PREFIX -DLLVM_TARGETS_TO_BUILD= -DLLVM_EXPERIMENTAL_TARGETS_TO_BUILD=WebAssembly ..
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make -j 4 install
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```
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* **C compiler errors: headers not found.** Make sure you have 32bit libc installed and visible to your clang.
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## License
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Licensed and distributed under either of
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* MIT license: [LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT
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or
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* Apache License, Version 2.0, ([LICENSE-APACHEv2](LICENSE-APACHEv2) or http://www.apache.org/licenses/LICENSE-2.0)
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at your option. This file may not be copied, modified, or distributed except according to those terms.
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