resolves rogchap#170 build v8go for musl libc

.github/workflows/gnalpinebuild.yml

@@ -0,0 +1,35 @@
+name: GN Alpine Build
+
+on:
+    workflow_dispatch:
+
+jobs:
+    build-alpine:
+        name: Build GN for Alpine x86_64
+        runs-on: ubuntu-20.04
+        steps:
+            -   name: Checkout
+                uses: actions/checkout@v3
+                with:
+                    submodules: true
+                    fetch-depth: 1
+            -   name: Set up QEMU
+                uses: docker/setup-qemu-action@v2
+            -   name: Set up Docker Buildx
+                uses: docker/setup-buildx-action@v2
+            -   name: Build container images
+                run: docker buildx build --platform=linux/amd64 --output=type=docker -t gn-builder-alpine -f deps/alpine-gn-builder.Dockerfile deps
+            -   name: Copy files
+                run: |
+                    id=$(docker create gn-builder-alpine)
+                    docker cp $id:/usr/local/bin/gn deps/alpine_x86_64/gn
+                    docker rm -v $id
+            -   name: Create PR
+                uses: peter-evans/create-pull-request@v3
+                with:
+                    commit-message: Update GN static library for Alpine x86_64
+                    branch-suffix: random
+                    delete-branch: true
+                    title: GN static library for Alpine x86_64
+                    body: Auto-generated pull request to build GN for Alpine x86_64
+                    base: master

.github/workflows/v8build.yml

@@ -14,32 +14,65 @@ jobs:
                 #
                 # We need xcode 12.4 or newer to cross compile between arm64/amd64
                 # https://github.com/actions/virtual-environments/blob/main/images/macos/macos-11-Readme.md#xcode
-                platform: [ubuntu-18.04, macos-11]
-                arch: [x86_64, arm64]
+                platform: [ ubuntu-18.04, macos-11 ]
+                arch: [ x86_64, arm64 ]
         runs-on: ${{ matrix.platform }}
         steps:
-            - name: Checkout
-              uses: actions/checkout@v2
-              with:
-                  submodules: true
-                  fetch-depth: 1
-            - name: Update depot_tools fetch config
-              run: cd deps/depot_tools && git config --unset-all remote.origin.fetch; git config --add remote.origin.fetch +refs/heads/*:refs/remotes/origin/*
-              shell: bash
-            - name: Install g++-aarch64-linux-gnu
-              if: matrix.platform == 'ubuntu-18.04' && matrix.arch == 'arm64'
-              run: sudo apt update && sudo apt install g++-aarch64-linux-gnu -y
-            - name: Build V8 linux
-              if: matrix.platform == 'ubuntu-18.04'
-              run: cd deps && ./build.py --no-clang --arch ${{ matrix.arch }}
-            - name: Build V8 macOS
-              if: matrix.platform == 'macos-11'
-              run: cd deps && ./build.py --arch ${{ matrix.arch }}
-            - name: Create PR
-              uses: peter-evans/create-pull-request@v3
-              with:
-                commit-message: Update V8 static library for ${{ matrix.platform }} ${{ matrix.arch }}
-                branch-suffix: random
-                delete-branch: true
-                title: V8 static library for ${{ matrix.platform }} ${{ matrix.arch }}
-                body: Auto-generated pull request to build V8 for ${{ matrix.platform }} ${{ matrix.arch }}
+            -   name: Checkout
+                uses: actions/checkout@v2
+                with:
+                    submodules: true
+                    fetch-depth: 1
+            -   name: Update depot_tools fetch config
+                run: cd deps/depot_tools && git config --unset-all remote.origin.fetch; git config --add remote.origin.fetch +refs/heads/*:refs/remotes/origin/*
+                shell: bash
+            -   name: Install g++-aarch64-linux-gnu
+                if: matrix.platform == 'ubuntu-18.04' && matrix.arch == 'arm64'
+                run: sudo apt update && sudo apt install g++-aarch64-linux-gnu -y
+            -   name: Build V8 linux
+                if: matrix.platform == 'ubuntu-18.04'
+                run: cd deps && ./build.py --no-clang --arch ${{ matrix.arch }}
+            -   name: Build V8 macOS
+                if: matrix.platform == 'macos-11'
+                run: cd deps && ./build.py --arch ${{ matrix.arch }}
+            -   name: Create PR
+                uses: peter-evans/create-pull-request@v3
+                with:
+                    commit-message: Update V8 static library for ${{ matrix.platform }} ${{ matrix.arch }}
+                    branch-suffix: random
+                    delete-branch: true
+                    title: V8 static library for ${{ matrix.platform }} ${{ matrix.arch }}
+                    body: Auto-generated pull request to build V8 for ${{ matrix.platform }} ${{ matrix.arch }}
+    build-alpine:
+        name: Build V8 for Alpine x86_64
+        runs-on: ubuntu-20.04
+        steps:
+            -   name: Checkout
+                uses: actions/checkout@v3
+                with:
+                    submodules: true
+                    fetch-depth: 1
+            -   name: Update depot_tools fetch config
+                run: cd deps/depot_tools && git config --unset-all remote.origin.fetch; git config --add remote.origin.fetch +refs/heads/*:refs/remotes/origin/*
+                shell: bash
+            -   name: Get V8 deps linux
+                run: cd deps && ./get_v8deps.py
+            -   name: Set up QEMU
+                uses: docker/setup-qemu-action@v2
+            -   name: Set up Docker Buildx
+                uses: docker/setup-buildx-action@v2
+            -   name: Build container images
+                run: docker buildx build --platform=linux/amd64 --output=type=docker -t v8-builder-alpine -f deps/alpine-v8-builder.Dockerfile deps
+            -   name: Copy files
+                run: |
+                    id=$(docker create v8-builder-alpine)
+                    docker cp $id:alpine_x86_64/. deps/alpine_x86_64/
+                    docker rm -v $id
+            -   name: Create PR
+                uses: peter-evans/create-pull-request@v3
+                with:
+                    commit-message: Update V8 static library for Alpine x86_64
+                    branch-suffix: random
+                    delete-branch: true
+                    title: V8 static library for Alpine x86_64
+                    body: Auto-generated pull request to build V8 for Alpine x86_64

.gitignore

@@ -10,3 +10,4 @@ deps/darwin-x86_64/libv8_debug.a
 c.out
 
 /v8go.test
+__pycache__

cgo.go

@@ -12,12 +12,14 @@ package v8go
 // #cgo darwin,arm64 LDFLAGS: -L${SRCDIR}/deps/darwin_arm64
 // #cgo linux,amd64 LDFLAGS: -L${SRCDIR}/deps/linux_x86_64 -ldl
 // #cgo linux,arm64 LDFLAGS: -L${SRCDIR}/deps/linux_arm64 -ldl
+// #cgo linux,amd64,musl-gcc LDFLAGS: -L${SRCDIR}/deps/alpine_x86_64 -ldl
 import "C"
 
 // These imports forces `go mod vendor` to pull in all the folders that
 // contain V8 libraries and headers which otherwise would be ignored.
 // DO NOT REMOVE
 import (
+	_ "rogchap.com/v8go/deps/alpine_x86_64"
 	_ "rogchap.com/v8go/deps/darwin_arm64"
 	_ "rogchap.com/v8go/deps/darwin_x86_64"
 	_ "rogchap.com/v8go/deps/include"

deps/alpine-gn-builder.Dockerfile

@@ -0,0 +1,31 @@
+#
+# Build GN for alpine (this is a build dependency)
+#
+FROM alpine:3.16.3 as gn-builder
+
+# This is the GN commit that we want to build.
+# Most commits will probably build just fine but this happened to be the latest commit when I did this.
+ARG GN_COMMIT=1c4151ff5c1d6fbf7fa800b8d4bb34d3abc03a41
+
+RUN \
+  apk add --update --virtual .gn-build-dependencies \
+    alpine-sdk \
+    binutils-gold \
+    clang \
+    curl \
+    git \
+    llvm12 \
+    ninja \
+    python3 \
+    tar \
+    xz \
+  # Quick fixes: we need the LLVM tooling in $PATH, and we also have to use gold instead of ld.
+  && PATH=$PATH:/usr/lib/llvm12/bin \
+  && cp -f /usr/bin/ld.gold /usr/bin/ld \
+  # Clone and build gn
+  && git clone https://gn.googlesource.com/gn /tmp/gn \
+  && git -C /tmp/gn checkout ${GN_COMMIT} \
+  && cd /tmp/gn \
+  && python3 build/gen.py \
+  && ninja -C out \
+  && cp -f /tmp/gn/out/gn /usr/local/bin/gn

deps/alpine-v8-builder.Dockerfile

@@ -0,0 +1,30 @@
+#
+# Building V8 for alpine
+#
+FROM alpine:3.16.3 as v8
+
+COPY depot_tools ./depot_tools
+COPY include ./include
+COPY v8 ./v8
+COPY .gclient compile_v8.py ./
+COPY alpine_x86_64 ./alpine_x86_64
+
+RUN \
+  apk add --update --virtual .v8-build-dependencies \
+    bash \
+    curl \
+    g++ \
+    gcc \
+    glib-dev \
+    icu-dev \
+    libstdc++ \
+    linux-headers \
+    make \
+    ninja \
+    python3 \
+    tar \
+    xz \
+  && cp alpine_x86_64/gn depot_tools/gn \
+  && ln -s /usr/bin/python3 /usr/bin/python \
+  # Compile V8
+  && ./compile_v8.py --no-clang --arch x86_64

deps/alpine_x86_64/vendor.go

@@ -0,0 +1,3 @@
+// Package alpine_x86_64 is required to provide support for vendoring modules
+// DO NOT REMOVE
+package alpine_x86_64

deps/build.py

@@ -4,6 +4,8 @@
 import subprocess
 import shutil
 import argparse
+from get_v8deps import v8deps
+from compile_v8 import v8compile
 
 valid_archs = ['arm64', 'x86_64']
 # "x86_64" is called "amd64" on Windows
@@ -22,131 +24,9 @@
 parser.set_defaults(debug=False, clang=True)
 args = parser.parse_args()
 
-deps_path = os.path.dirname(os.path.realpath(__file__))
-v8_path = os.path.join(deps_path, "v8")
-tools_path = os.path.join(deps_path, "depot_tools")
-is_windows = platform.system().lower() == "windows"
-
-gclient_sln = [
-    { "name"        : "v8",
-        "url"         : "https://chromium.googlesource.com/v8/v8.git",
-        "deps_file"   : "DEPS",
-        "managed"     : False,
-        "custom_deps" : {
-            # These deps are unnecessary for building.
-            "v8/testing/gmock"                      : None,
-            "v8/test/wasm-js"                       : None,
-            "v8/third_party/android_tools"          : None,
-            "v8/third_party/catapult"               : None,
-            "v8/third_party/colorama/src"           : None,
-            "v8/tools/gyp"                          : None,
-            "v8/tools/luci-go"                      : None,
-        },
-        "custom_vars": {
-            "build_for_node" : True,
-        },
-    },
-]
-
-gn_args = """
-is_debug=%s
-is_clang=%s
-target_cpu="%s"
-v8_target_cpu="%s"
-clang_use_chrome_plugins=false
-use_custom_libcxx=false
-use_sysroot=false
-symbol_level=%s
-strip_debug_info=%s
-is_component_build=false
-v8_monolithic=true
-v8_use_external_startup_data=false
-treat_warnings_as_errors=false
-v8_embedder_string="-v8go"
-v8_enable_gdbjit=false
-v8_enable_i18n_support=true
-icu_use_data_file=false
-v8_enable_test_features=false
-v8_untrusted_code_mitigations=false
-exclude_unwind_tables=true
-"""
-
-def v8deps():
-    spec = "solutions = %s" % gclient_sln
-    env = os.environ.copy()
-    env["PATH"] = tools_path + os.pathsep + env["PATH"]
-    subprocess.check_call(cmd(["gclient", "sync", "--spec", spec]),
-                        cwd=deps_path,
-                        env=env)
-
-def cmd(args):
-    return ["cmd", "/c"] + args if is_windows else args
-
-def os_arch():
-    u = platform.uname()
-    return u[0].lower() + "_" + args.arch
-
-def v8_arch():
-    if args.arch == "x86_64":
-        return "x64"
-    return args.arch
-
-def apply_mingw_patches():
-    v8_build_path = os.path.join(v8_path, "build")
-    apply_patch("0000-add-mingw-main-code-changes", v8_path)
-    apply_patch("0001-add-mingw-toolchain", v8_build_path)
-    update_last_change()
-    zlib_path = os.path.join(v8_path, "third_party", "zlib")
-    zlib_src_gn = os.path.join(deps_path, os_arch(), "zlib.gn")
-    zlib_dst_gn = os.path.join(zlib_path, "BUILD.gn")
-    shutil.copy(zlib_src_gn, zlib_dst_gn)
-
-def apply_patch(patch_name, working_dir):
-    patch_path = os.path.join(deps_path, os_arch(), patch_name + ".patch")
-    subprocess.check_call(["git", "apply", "-v", patch_path], cwd=working_dir)
-
-def update_last_change():
-    out_path = os.path.join(v8_path, "build", "util", "LASTCHANGE")
-    subprocess.check_call(["python", "build/util/lastchange.py", "-o", out_path], cwd=v8_path)
-
 def main():
     v8deps()
-    if is_windows:
-        apply_mingw_patches()
-
-    gn_path = os.path.join(tools_path, "gn")
-    assert(os.path.exists(gn_path))
-    ninja_path = os.path.join(tools_path, "ninja" + (".exe" if is_windows else ""))
-    assert(os.path.exists(ninja_path))
-
-    build_path = os.path.join(deps_path, ".build", os_arch())
-    env = os.environ.copy()
-
-    is_debug = 'true' if args.debug else 'false'
-    is_clang = 'true' if args.clang else 'false'
-    # symbol_level = 1 includes line number information
-    # symbol_level = 2 can be used for additional debug information, but it can increase the
-    #   compiled library by an order of magnitude and further slow down compilation
-    symbol_level = 1 if args.debug else 0
-    strip_debug_info = 'false' if args.debug else 'true'
-
-    arch = v8_arch()
-    gnargs = gn_args % (is_debug, is_clang, arch, arch, symbol_level, strip_debug_info)
-    gen_args = gnargs.replace('\n', ' ')
-
-    subprocess.check_call(cmd([gn_path, "gen", build_path, "--args=" + gen_args]),
-                        cwd=v8_path,
-                        env=env)
-    subprocess.check_call([ninja_path, "-v", "-C", build_path, "v8_monolith"],
-                        cwd=v8_path,
-                        env=env)
-
-    lib_fn = os.path.join(build_path, "obj/libv8_monolith.a")
-    dest_path = os.path.join(deps_path, os_arch())
-    if not os.path.exists(dest_path):
-        os.makedirs(dest_path)
-    dest_fn = os.path.join(dest_path, 'libv8.a')
-    shutil.copy(lib_fn, dest_fn)
+    v8compile(args.debug, args.clang, args.arch)
 
 
 if __name__ == "__main__":