cross.yml

name: Cross

on:
  pull_request:
    branches:
      - master
  push:
    branches:
      - master
    tags: '*'

concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true

jobs:
  build-cross-qemu:
    runs-on: ubuntu-24.04
    timeout-minutes: 10
    name: build-cross-qemu-${{ matrix.config.arch }}
    strategy:
      fail-fast: false
      matrix:
        config:
          - { arch: arm,         triple: arm-linux-gnueabihf }
          - { arch: aarch64,     triple: aarch64-linux-gnu }
          - { arch: ppc,         triple: powerpc-linux-gnu }
          - { arch: ppc64,       triple: powerpc64-linux-gnu }
          - { arch: ppc64le,     triple: powerpc64le-linux-gnu }
          - { arch: mips,        triple: mips-linux-gnu }
          - { arch: mipsel,      triple: mipsel-linux-gnu }
          # mips64 / mips64el disabled. Tests fail under Ubuntu 24.04's
          # qemu 8.2 (spurious FPU exception flags); Ubuntu 26.04 has
          # newer qemu but dropped the mips64 cross-toolchain entirely.
          # See #347.
          # - { arch: mips64,    triple: mips64-linux-gnuabi64 }
          # - { arch: mips64el,  triple: mips64el-linux-gnuabi64 }
          - { arch: riscv64,     triple: riscv64-linux-gnu }
          - { arch: s390x,       triple: s390x-linux-gnu }
          # loongarch64 has no unversioned apt package; pin to gcc-14.
          - { arch: loongarch64, triple: loongarch64-linux-gnu,
              gcc_pkg: gcc-14-loongarch64-linux-gnu,
              cc: loongarch64-linux-gnu-gcc-14,
              ar: loongarch64-linux-gnu-gcc-ar-14 }
    env:
      ARCH: ${{ matrix.config.arch }}
      TRIPLE: ${{ matrix.config.triple }}
      CC: ${{ matrix.config.cc }}
      AR: ${{ matrix.config.ar }}
    steps:
      - uses: actions/checkout@v7
      - name: Install qemu and toolchain
        run: |
          sudo apt update
          sudo apt install -y qemu-user qemu-user-binfmt \
            ${{ matrix.config.gcc_pkg || format('gcc-{0}', matrix.config.triple) }}
      - name: Build with ${{ matrix.config.triple }}-gcc
        run: make -j$(nproc) ARCH=$ARCH TOOLPREFIX=$TRIPLE- ${CC:+CC=$CC} ${AR:+AR=$AR}
      - name: Build tests
        # Build the regression programs with the cross toolchain too, so the
        # run step below only executes them (under qemu) rather than trying to
        # rebuild them with the host compiler.
        run: make -j$(nproc) -C test all regression-build ARCH=$ARCH TOOLPREFIX=$TRIPLE- ${CC:+CC=$CC} ${AR:+AR=$AR}
      - name: Run tests under qemu
        env:
          QEMU_LD_PREFIX: /usr/${{ matrix.config.triple }}
          LD_LIBRARY_PATH: .
        run: make test ARCH=$ARCH TOOLPREFIX=$TRIPLE- ${CC:+CC=$CC} ${AR:+AR=$AR}

  # Regression test for #262 / #349: the RISC-V single-float ABI (lp64f /
  # ilp32f) used to be rejected by include/openlibm_fenv_riscv.h with an
  # `#error`. This job rebuilds the whole library with `-mabi=lp64f` to make
  # sure the header (and the rest of openlibm) accepts that ABI.
  #
  # This is a COMPILE-ONLY check (build the static libopenlibm.a, no qemu run).
  # Ubuntu's gcc-riscv64-linux-gnu ships only the default lp64d sysroot, so a
  # full shared-library link or a qemu execution under lp64f is impossible
  # without a custom single-float sysroot the distro does not provide. Building
  # the static archive needs no libc/CRT link, so it compiles every source file
  # (including riscv64/fenv.c, which pulls in the fixed header) under the
  # single-float ABI and directly regresses the removed `#error`. Adding a
  # bespoke lp64f sysroot would be exactly the kind of fragile, unmaintainable
  # toolchain dependency that got mips64 disabled in #347, so we deliberately
  # avoid it.
  build-cross-riscv64-lp64f:
    runs-on: ubuntu-24.04
    timeout-minutes: 10
    name: build-cross-riscv64-lp64f
    steps:
      - uses: actions/checkout@v7
      - name: Install RISC-V toolchain
        run: |
          sudo apt update
          sudo apt install -y gcc-riscv64-linux-gnu
      - name: Build libopenlibm.a for the single-float ABI (lp64f)
        run: |
          make -j$(nproc) ARCH=riscv64 TOOLPREFIX=riscv64-linux-gnu- \
            CFLAGS_arch='-march=rv64imafc -mabi=lp64f' \
            SFLAGS_arch='-march=rv64imafc -mabi=lp64f' \
            libopenlibm.a