下载示例代码

  1. git clone https://github.com/bazelbuild/examples

C++ 代码在 examples/cpp-tutorial 下，目录结构如下：

  1. examples
  2. └── cpp-tutorial
  3.     ├──stage1
  4.     │  ├── main
  5.     │  │   ├── BUILD
  6.     │  │   └── hello-world.cc
  7.     │  └── WORKSPACE
  8.     ├──stage2
  9.     │  ├── main
  10.     │  │   ├── BUILD
  11.     │  │   ├── hello-world.cc
  12.     │  │   ├── hello-greet.cc
  13.     │  │   └── hello-greet.h
  14.     │  └── WORKSPACE
  15.     └──stage3
  16.        ├── main
  17.        │   ├── BUILD
  18.        │   ├── hello-world.cc
  19.        │   ├── hello-greet.cc
  20.        │   └── hello-greet.h
  21.        ├── lib
  22.        │   ├── BUILD
  23.        │   ├── hello-time.cc
  24.        │   └── hello-time.h
  25.        └── WORKSPACE

使用 Bazel 构建

stage1

cpp-tutorial/stage1/main 下 BUILD 文件如下：

  1. cc_binary(
  2.     name = "hello-world",
  3.     srcs = ["hello-world.cc"],
  4. )

构建项目

  1. cd cpp-tutorial/stage1
  2. bazel build //main:hello-world

run

  1. bazel-bin/main/hello-world

查看依赖图

  1. bazel query --notool_deps --noimplicit_deps "deps(//main:hello-world)" --output graph

可以在 http://viz-js.com/ 查看 graph
image.png

stage2

指定多个 target

cpp-tutorial/stage2/main 下 BUILD 文件如下：

  1. cc_library(
  2.     name = "hello-greet",
  3.     srcs = ["hello-greet.cc"],
  4.     hdrs = ["hello-greet.h"],
  5. )
  7. cc_binary(
  8.     name = "hello-world",
  9.     srcs = ["hello-world.cc"],
  10.     deps = [
  11.         ":hello-greet",
  12.     ],
  13. )

构建项目

  1. cd cpp-tutorial/stage2
  2. bazel build //main:hello-world

查看依赖图

  1. bazel query --notool_deps --noimplicit_deps "deps(//main:hello-world)" --output graph

image.png

stage3

多个 package

cpp-tutorial/stage3/lib 下 BUILD 文件如下：

  1. cc_library(
  2.     name = "hello-time",
  3.     srcs = ["hello-time.cc"],
  4.     hdrs = ["hello-time.h"],
  5.     visibility = ["//main:__pkg__"],
  6. )

cpp-tutorial/stage3/main 下 BUILD 文件如下：

  1. cc_library(
  2.     name = "hello-greet",
  3.     srcs = ["hello-greet.cc"],
  4.     hdrs = ["hello-greet.h"],
  5. )
  7. cc_binary(
  8.     name = "hello-world",
  9.     srcs = ["hello-world.cc"],
  10.     deps = [
  11.         ":hello-greet",
  12.         "//lib:hello-time",
  13.     ],
  14. )

构建项目

  1. cd cpp-tutorial/stage3
  2. bazel build //main:hello-world

查看依赖图

  1. bazel query --notool_deps --noimplicit_deps "deps(//main:hello-world)" --output graph

image.png

参考

  1. Introduction to Bazel: Building a C++ Project
  2. bazelbuild github
  3. C/C++ Rules