Add build workflow and build script

.github/workflows/build.yml

@@ -0,0 +1,43 @@
+name: CI
+
+on:
+  push:
+  pull_request:
+  workflow_dispatch:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    container: emscripten/emsdk:latest
+
+    strategy:
+      matrix:
+        processor: #  ARM ARM (thumb) AArch64 Mips (32) Mips (64) PowerPC (32) PowerPC (64) Sparc x86 (16) x86 (32) x86 (64)
+          - arm
+          - arm64
+          - mips
+          - mips64
+          - powerpc
+          - powerpc64
+          - sparc
+          - i386
+          - x86_64
+          - riscv
+          - riscv64
+          - loongarch
+          - loongarch64
+          - wasm32
+
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Build
+        id: build
+        run: |
+          chmod +x ./build.sh
+          ./build.sh ${{ matrix.processor }}-unknown-linux-gnu
+
+      - uses: actions/upload-artifact@v4
+        with:
+          name: build-${{ matrix.processor }}
+          path: ${{ steps.build.outputs.build.dir }}

build.sh

@@ -0,0 +1,74 @@
+#!/bin/bash -xve
+
+target=$1
+if [ -z "$target" ]; then
+    echo "Usage: $0 <target>"
+    echo "  target: processor target (e.g. riscv64-linux-gnu)"
+    exit 1
+fi
+
+src_dir="binutils"
+build_dir_base=$(realpath -f"build")
+
+target_paths=(
+    "binutils/addr2line"
+    "binutils/ar"
+    "binutils/cxxfilt"
+    "binutils/elfedit"
+    "binutils/nm-new"
+    "binutils/objcopy"
+    "binutils/objdump"
+    "binutils/ranlib"
+    "binutils/readelf"
+    "binutils/size"
+    "binutils/strings"
+    "binutils/strip-new"
+    "gas/as-new"
+    "gprof/gprof"
+    "ld/ld-new"
+)
+
+common_configure_flags=(
+    "--disable-doc"
+    "--disable-nls"
+    "--disable-gdb"
+    "--disable-gdbserver"
+    "--disable-libdecnumber"
+    "--disable-readline"
+    "--disable-sim"
+    "--host=wasm32"
+    "--target=${target}"
+)
+
+function build_binutils() {
+    build_type=$1
+    build_dir=$(realpath -f "$build_dir_base/$build_type")
+
+    git clean -fdx
+    git reset --hard HEAD
+    find . -name 'config.cache' -delete
+
+    emconfigure ./configure "${common_configure_flags[@]}"
+
+    ldflags="-sMODULARIZE=1 -sFORCE_FILESYSTEM=1 -sEXPORTED_RUNTIME_METHODS=FS"
+    if [ "$build_type" = "esm" ]; then
+        ldflags="${ldflags} -sEXPORT_ES6=1"
+    fi
+
+    emmake make -j$(nproc) \
+      "CFLAGS=-DHAVE_PSIGNAL=1 -DELIDE_CODE -Oz" \
+      "LDFLAGS=$ldflags"
+
+    mkdir -p "${build_dir}"
+    for path in "${target_paths[@]}"; do
+        cp "${path}" "${build_dir}/$(basename "${path}").js"
+        cp "${path}.wasm" "${build_dir}/$(basename "${path}").wasm"
+    done
+
+    return 0
+}
+
+build_binutils cjs
+build_binutils esm
+
+echo "dir=$build_dir_base" >> $GITHUB_OUTPUT