int256/.github/workflows/wasm.yml at develop · cppalliance/int256 · GitHub

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# Copyright 2026 Matt Borland
# Distributed under the Boost Software License, Version 1.0.
# (See accompanying file LICENSE_1_0.txt or copy at http://boost.org/LICENSE_1_0.txt)
#
# Builds the full test suite for WebAssembly (wasm32) with Emscripten and runs it
# under node. wasm32 is a 32-bit platform (ILP32), so this exercises the library
# without native 64-bit registers and with the compiler-rt software fallbacks for
# 64-bit and 256-bit division (e.g. __udivdi3 and friends). See issue discussion
# about 32-bit targets that lack a native 64-bit division instruction.

name: wasm

on:
  pull_request:
  push:
    branches:
      - master
      - develop
      - feature/**

concurrency:
  group: ${{format('wasm-{0}:{1}', github.repository, github.ref)}}
  cancel-in-progress: true

jobs:
  emscripten-cmake-test:
    strategy:
      fail-fast: false
      matrix:
        include:
          - cxxstd: '14'
          - cxxstd: '17'
          - cxxstd: '20'

    runs-on: ubuntu-24.04
    container: emscripten/emsdk:latest

    steps:
      - uses: actions/checkout@v6

      - name: Setup Boost
        run: |
          echo GITHUB_REPOSITORY: $GITHUB_REPOSITORY
          LIBRARY=${GITHUB_REPOSITORY#*/}
          echo LIBRARY: $LIBRARY
          echo "LIBRARY=$LIBRARY" >> $GITHUB_ENV
          echo GITHUB_BASE_REF: $GITHUB_BASE_REF
          echo GITHUB_REF: $GITHUB_REF
          REF=${GITHUB_BASE_REF:-$GITHUB_REF}
          REF=${REF#refs/heads/}
          echo REF: $REF
          BOOST_BRANCH=develop && [ "$REF" == "master" ] && BOOST_BRANCH=master || true
          echo BOOST_BRANCH: $BOOST_BRANCH
          cd ..
          git clone -b $BOOST_BRANCH --depth 1 https://github.com/boostorg/boost.git boost-root
          cd boost-root
          mkdir -p libs/$LIBRARY
          cp -r $GITHUB_WORKSPACE/* libs/$LIBRARY
          git submodule update --init tools/boostdep
          python3 tools/boostdep/depinst/depinst.py --git_args "--jobs 3" $LIBRARY

      - name: Configure
        run: |
          cd ../boost-root
          mkdir __build__ && cd __build__
          # Boost.Config does not define BOOST_HAS_PTHREADS for Emscripten, which sends
          # Boost.Container's thread_mutex down its Windows path and fails to compile.
          # Emscripten always provides the pthread API (single-threaded no-op stubs
          # without -pthread), so defining it here is correct for this target.
          # The wasm stack defaults to 64 KB; raise it to the typical desktop 8 MB so
          # examples with large stack arrays behave as they do on other platforms.
          emcmake cmake -DBOOST_INCLUDE_LIBRARIES=$LIBRARY -DBUILD_TESTING=ON -DCMAKE_CXX_STANDARD=${{matrix.cxxstd}} -DCMAKE_CXX_FLAGS="-DBOOST_HAS_PTHREADS" -DCMAKE_EXE_LINKER_FLAGS="-sSTACK_SIZE=8388608" ..

      - name: Build tests
        run: |
          cd ../boost-root/__build__
          cmake --build . --target tests -j $(nproc)

      - name: Run tests
        run: |
          cd ../boost-root/__build__
          ctest --output-on-failure --no-tests=error -j $(nproc)