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Brazel Go

Brazel Go​

tip
  • 默认开启 trimpath
  • 暂不支持 coverage
# cross compile no cgo
bazel build --platforms=@io_bazel_rules_go//go/toolchain:linux_amd64 //cmd
# cross compile with cgo
bazel build --platforms=@io_bazel_rules_go//go/toolchain:linux_amd64_cgo //cmd
workspace(name = "my_project")

load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")

http_archive(
    name = "io_bazel_rules_go",
    sha256 = "2b1641428dff9018f9e85c0384f03ec6c10660d935b750e3fa1492a281a53b0f",
    urls = [
        "https://mirror.bazel.build/github.com/bazelbuild/rules_go/releases/download/v0.29.0/rules_go-v0.29.0.zip",
        "https://github.com/bazelbuild/rules_go/releases/download/v0.29.0/rules_go-v0.29.0.zip",
    ],
)

http_archive(
    name = "bazel_gazelle",
    sha256 = "de69a09dc70417580aabf20a28619bb3ef60d038470c7cf8442fafcf627c21cb",
    urls = [
        "https://mirror.bazel.build/github.com/bazelbuild/bazel-gazelle/releases/download/v0.24.0/bazel-gazelle-v0.24.0.tar.gz",
        "https://github.com/bazelbuild/bazel-gazelle/releases/download/v0.24.0/bazel-gazelle-v0.24.0.tar.gz",
    ],
)

load("@io_bazel_rules_go//go:deps.bzl", "go_register_toolchains", "go_rules_dependencies")
load("@bazel_gazelle//:deps.bzl", "gazelle_dependencies", "go_repository")

#
go_rules_dependencies()
go_register_toolchains(version = "1.17.2")
gazelle_dependencies()
BUILD
load("@bazel_gazelle//:def.bzl", "gazelle")

# gazelle:prefix wener.me/wode/core
gazelle(name = "gazelle")

gazelle(
    name = "gazelle-update-repos",
    args = [
        "-from_file=go.mod",
        "-to_macro=deps.bzl%go_dependencies",
        "-prune",
        "-build_file_proto_mode=disable_global",
    ],
    command = "update-repos",
)
bazel run //:gazelle

bazel run //:gazelle -- update-repos -from_file=go.mod -to_macro=deps.bzl%go_dependencies
bazel run //:gazelle-update-repos
go get github.com/bazelbuild/bazel-gazelle/cmd/gazelle
gazelle -go_prefix github.com/example/project

cross compile​

go_library(
    name = "foo",
    srcs = [
        "foo_linux.go",
        "foo_windows.go",
    ],
    deps = select({
        "@io_bazel_rules_go//go/platform:linux_amd64": [
            "//bar_linux",
        ],
        "@io_bazel_rules_go//go/platform:windows_amd64": [
            "//bar_windows",
        ],
        "//conditions:default": [],
    }),
)

go_repository does not support file path replacements​

rules_go​

  • bazelbuild/rules_go
  • Build modes
    • static, race, msan, pure, strip, debug, gotags, linkmode
    • 命令行 --@io_bazel_rules_go//go/config:<mode>
    • go_binary(<mode> = "")
  • toolchain
    • go_register_toolchains -> @go_sdk -> go_download_sdk
    • go_download_sdk - 下载
    • go_local_sdk - 指定本地 PATH
  • go_binary
    • out - 输出名字
      • 默认如果 name 和 dir 名字相同，则会添加下划线
load("@io_bazel_rules_go//go:deps.bzl", "go_rules_dependencies", "go_register_toolchains")

go_rules_dependencies()

go_register_toolchains(version = "1.15.5")
# 使用 host 的 go 版本 - 编译不一定可重现
# 但更快，少了下载安装过程
go_register_toolchains(version = "host")
# 交叉编译
bazel build --platforms=@io_bazel_rules_go//go/toolchain:linux_amd64 //cmd
# with CGO
bazel build --platforms=@io_bazel_rules_go//go/toolchain:linux_amd64_cgo //cmd
  • 也可以在 go_binary 设置 goos 和 goarch

gazelle​

caution
  • 默认要求 proto 包名匹配目录 名字 - #271
    • go_repository(build_file_proto_mode = "disable_global",)
# 命令行生成
gazelle -go_prefix go-micro.dev/v4 -proto disable

gazelle update

go_sdk​

# Host
go_host_sdk(name="go_sdk")
# Local
go_local_sdk(
    name = "go_sdk",
    path = "/Users/wener/sdk/go1.18beta1",
)
go_register_toolchains()

# Download
go_register_toolchains(version = "1.17.6")
# Host
go_register_toolchains(version = "host")

found but does not contain package​

is not visible from target​

缓存相关问题​

go: cannot find GOROOT directory: /usr/local/go​

/usr/lib/go