baseline-c ++

bazel project

Use bazel build C ++ projects, the project directory bazel project must contain an empty file WORKSPACE whose existence indicates the root directory of the project is located. BUILD file contains build rules.
Common bazel + c ++ project file structure:

.
├── add.cc
├── add.h
├── BUILD
├── main.cc
└── WORKSPACE

Build a simple project bazel

Build helloworld project:

• hello.cc file as follows:

#include <iostream>
int main()
{
     std::cout << "Hello world" << std::endl;
     return 0;                                                                                                                                                                                            
 }

• BUILD file as follows:

cc_library(
    name = "test",
    srcs = ["hello.cc"],                                                                                                                                                                                     
)

- name：工程的名字
- srcs：项目的源代码

• Constructbazel build //:test
  • //: Construction of the project is located in the root directory (WORKSPACE directory), test as specified above cc_library name, output is as follows:

INFO: Invocation ID: 4292b15c-ac1c-49d4-9a29-cbeea8cb2852
INFO: Analysed target //:test (0 packages loaded, 0 targets configured).
INFO: Found 1 target...
Target //:test up-to-date:
  bazel-bin/libtest.a
  bazel-bin/libtest.so
INFO: Elapsed time: 0.062s, Critical Path: 0.00s
INFO: 0 processes.
INFO: Build completed successfully, 1 total action

Output files are stored in the project directory bazel-bindirectory.

Construction of the project include the header file

Project directory as follows:

.
├── add.cc
├── add.h
├── BUILD
├── main.cc
└── WORKSPACE

add.cc file:

#include "add.h"
int add(int a,int b)
{
    return a+b;
}

Header add.h:

#ifndef ADD_H_
#define ADD_H_
int add(int a,int b);
#endif

main.cc file:

#include <iostream>
#include "add.h"
int main()
{
    int a,b;
    std::cin>>a>>b;
    std::cout<<a<<"+"<<b<<" = "<<add(a,b);
    return 0;
}

Build file:

cc_library(
    name = "add",
    srcs = ["add.cc"],
    hdrs = ["add.h"],
)
cc_binary(
    name = "math",
    srcs = ["main.cc"],
    deps = [
        ":add"
    ]
)

Explanation:

• cc_library (name): library file name
• cc_library (srcs): library source files
• Header library files: cc_library (hdrs)
• Name of Project: cc_binary (name)
• cc_binary (srcs): Engineering main code
• cc_binary (deps): dependent libraries

Build the code:

bazel build //:math

View dependency graph:

xdot <(bazel query --nohost_deps --noimplicit_deps 'deps(//:math)' \
  --output graph)

The dependency graph as follows:

source code download