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Wasm3 development notes

This project uses CMake. General build steps look like:

mkdir -p build
cd build
cmake ..
make -j8

Wasm3 is continuously tested with Clang, GCC, MSVC compilers, and on multiple platforms. It can be easily integrated into any build system, as shown in platforms.

Build on Linux, OS X


mkdir build
cd build
cmake -GNinja -DCLANG_SUFFIX="-9" ..


mkdir build
cd build
cmake -GNinja ..

Build on Windows


Recommended tools:

# Prepare environment (if needed):
"C:\Program Files (x86)\Microsoft Visual Studio\2019\BuildTools\VC\Auxiliary\Build\vcvars64.bat"
set PATH=C:\Python36-32\;C:\Python36-32\Scripts\;%PATH%

Build with MSBuild

# Create a build directory as usual, then build a specific configuration
mkdir build
cd build

# Configure Clang, x64
cmake -G"Visual Studio 16 2019" -A x64 -T ClangCL ..

# Configure Clang, x86
cmake -G"Visual Studio 16 2019" -A Win32 -T ClangCL ..

# Configure MSVC, x64
cmake -G"Visual Studio 16 2019" -A x64 ..

# Configure MSVC, x86
cmake -G"Visual Studio 16 2019" -A Win32 ..

# Build
cmake --build . --config Release
cp ./Release/wasm3.exe ./

Build with Ninja

set PATH=C:\Program Files\CMake\bin;%PATH%
set PATH=C:\Program Files\LLVM\bin;%PATH%

# Clang
cmake -GNinja -DCLANG_CL=1 ..

cmake -GNinja ..

Build using compiler directly

This can be useful for cross-compilation, quick builds or when a build system (CMake, Ninja, etc.) is not available.


gcc -O3 -g0 -s -Isource -Dd_m3HasWASI source/*.c platforms/app/main.c -lm -o wasm3


cl source/*.c platforms/app/main.c /Isource /MD /Ox /Oy /Gw /GS- /W0 /Dd_m3HasWASI /Fewasm3.exe /link advapi32.lib


x86_64-w64-mingw32-gcc -O3 -g0 -s -Isource -Dd_m3HasWASI source/*.c platforms/app/main.c -lm -lpthread -static -o wasm3.exe

Build for microcontrollers

In ./platforms/ folder you can find projects for different targets. Some of them are using Platformio, so you can follow the regular pio build process. Others have custom instructions in respective README.md files.

Build with WasiEnv

wasimake cmake -GNinja ..

If you want to enable experimental WASM features during the build:

export CFLAGS="-Xclang -target-feature -Xclang +tail-call"
wasimake cmake -GNinja ..

Here's how some options can be used with different tools:

Clang target-feature option          WABT option                        Chromium --js-flags option
+multivalue                          --enable-multi-value               --experimental-wasm-mv
+tail-call                           --enable-tail-call                 --experimental-wasm-return-call
+bulk-memory                         --enable-bulk-memory               --experimental-wasm-bulk-memory
+nontrapping-fptoint                 --enable-saturating-float-to-int   --experimental-wasm-sat-f2i-conversions
+sign-ext                            --enable-sign-extension            --experimental-wasm-se
+simd128, +unimplemented-simd128     --enable-simd                      --experimental-wasm-simd
# List clang options:
llc -march=wasm32 -mattr=help

# List Chromium options:
chromium-browser --single-process --js-flags="--help" 2>&1 | grep wasm