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# M3/Wasm development notes
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M3/Wasm project uses CMake. It can also be easily integarted into any build system.
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General build steps look like:
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```sh
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mkdir -p build
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cd build
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cmake ..
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make -j8
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```
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It's recommended to use Clang/Ninja to build the project.
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**Note:** When using GCC or Microsoft C++ Compiler, all `.c` files are forced to be comiled as `C++` to eliminate some errors.
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Currently, support for these compilers was added for evaluation purposes.
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## Build on Linux
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### Clang (recommended)
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```sh
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mkdir -p build
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cd build
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cmake -GNinja -DCLANG_SUFFIX="-9" ..
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ninja
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```
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### GCC
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```sh
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cmake -GNinja ..
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ninja
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```
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## Build on Windows
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You may need to install:
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- [Build Tools for Visual Studio 2019](https://visualstudio.microsoft.com/downloads/#build-tools-for-visual-studio-2019)
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- [CMake](https://cmake.org/download/)
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- [Ninja](https://github.com/ninja-build/ninja/releases)
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- [Clang 9](https://releases.llvm.org/download.html#9.0.0)
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```bat
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REM Prepare environment (if needed):
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"C:\Program Files (x86)\Microsoft Visual Studio\2019\BuildTools\VC\Auxiliary\Build\vcvars64.bat"
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set PATH=C:\Program Files\CMake\bin;%PATH%
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set PATH=C:\Program Files\LLVM\bin;%PATH%
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set PATH=C:\Python36-32\;C:\Python36-32\Scripts\;%PATH%
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```
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### Clang with Ninja (recommended)
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```bat
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mkdir build
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cd build
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cmake -GNinja -DCLANG_CL=1 ..
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ninja
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```
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### Clang with MSBuild
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```bat
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cmake -G"Visual Studio 16 2019" -A x64 -T ClangCL ..
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MSBuild /p:Configuration=Release wasm3.sln
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```
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### MSVC with MSBuild
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```bat
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cmake -G"Visual Studio 16 2019" -A x64 ..
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MSBuild /p:Configuration=Release wasm3.sln
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```
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### MSVC with Ninja
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```bat
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cmake -GNinja ..
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ninja
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```
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## Build using Emscripten
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```sh
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source /opt/emsdk/emsdk_env.sh --build=Release
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mkdir -p build
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cd build
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cmake -GNinja -DEMSCRIPTEN=1 ..
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ninja
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```
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**Note:** the build uses tail-call WebAssembly extension.
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This is currently available in V8:
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```sh
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chrome --js-flags="--experimental-wasm-return-call --wasm-opt"
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```
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## Running WebAssembly spec tests
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To run spec tests, you need `python3` and `WABT` (The WebAssembly Binary Toolkit).
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```sh
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cd test
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python3 ./run-spec-test.py
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```
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It will automatically download, extract, preprocess the WebAssembly core test suite.
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