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nim-eth-contracts
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Update README.md

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Yuriy Glukhov 2018-11-13 14:15:28 +02:00 committed by GitHub
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@ -4,7 +4,8 @@ Disclaimer: WIP
This is a sample of how building eWASM contracts in Nim is possible.
Requirements:
* clang 6.0 or later with WebAssembly support. Most likely has to be built manually.
* clang 7.0 or later with WebAssembly support. Most likely has to be built manually.
* 32bit version of libc. On linuxes it is usually provided by the package manager.
* `wasm2wat` and `wat2wasm` from [wabt (WebAssembly binary toolkit)](https://github.com/WebAssembly/wabt)
* [optional] [wasm-gc](https://github.com/alexcrichton/wasm-gc) optimizer
@ -14,6 +15,25 @@ export WASM_LLVM_BIN=/path/to/llvm/bin/folder
nimble examples
```
## Troubleshooting
* **Emscripten doesn't work!** It is not expected to. Use clang with wasm target enabled.
* **clang is difficult to build.** No, it's easy. Follow these steps:
```
tag=release_70
INSTALL_PREFIX=$(pwd)/llvm-wasm
git clone --depth 1 --branch $tag https://github.com/llvm-mirror/llvm.git
cd llvm/tools
git clone --depth 1 --branch $tag https://github.com/llvm-mirror/clang
git clone --depth 1 --branch $tag https://github.com/llvm-mirror/lld
cd ..
mkdir build
cd build
cmake -G "Unix Makefiles" -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=$INSTALL_PREFIX -DLLVM_TARGETS_TO_BUILD= -DLLVM_EXPERIMENTAL_TARGETS_TO_BUILD=WebAssembly ..
make -j 4 install
```
* **C compiler errors: headers not found.** Make sure you have 32bit libc installed and visible to your clang.
## License
Licensed under one of the following: