B ++ के साथ C ++ बनाएँ

परिचय और प्रेरणा

उदाहरण 1. तुच्छ

#include <iostream>

int main() {
   std::cout << "Hello, habr" << std::endl;
   return 0;
}

cc_binary(
  name = "hello_world",
  srcs = "main.cc"
)

bazel build //main:hello_world

उदाहरण 2. अपनी लाइब्रेरी के साथ बनाएँ

#ifndef SQUQRE_SQUARE_H_
#define SQUQRE_SQUARE_H_

int Square(int x);

#endif // SQUQRE_SQUARE_H_

#include "square/square.h"

int Square(int x) {
  return x * x;
}

cc_library(
  name = "square",
  srcs = ["square.cc"],
  hdrs = ["square.h"],
  visibility = ["//visibility:public"]
)

#include <iostream>
#include "square/square.h"

int main() {
  std::cout << "Hello, bazel!" << std::endl;
  std::cout << Square(2) << std::endl;
  return 0;
}

cc_binary(
  name = "hello_world",
  srcs = ["main.cc"],
  deps = ["//square:square"]
)

bazel build //main:hello_world

उदाहरण 3. परीक्षणों को जोड़ना

load("@bazel_tools//tools/build_defs/repo:git.bzl", "git_repository")

git_repository(
  name = "googletest",
  remote = "https://github.com/google/googletest",
  tag = "release-1.8.1"
)

#include "gtest/gtest.h"
#include "square/square.h"

TEST(SquareTests, Basics) {
    EXPECT_EQ(Square(-1), 1);
    EXPECT_EQ(Square(1), 1);
    EXPECT_EQ(Square(2), 4);
}

cc_test(
  name = "unittests",
  srcs = ["square_unittest.cc"],
  deps = [
   "//square:square",
   "@googletest//:gtest_main"
  ]
)

bazel test //test:unittests

bazel coverage //test:unittests

bazel build //test:unittests --compilation_mode=dbg -s

उदाहरण 4. अन्य पुस्तकालयों को जोड़ना जो न जाने कैसे बाज़ बन जाते हैं

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

http_file(
  name = "CLI11",
  downloaded_file_path = "CLI11.hpp",
  urls = ["https://github.com/CLIUtils/CLI11/releases/download/v1.9.0/CLI11.hpp"],
  sha256 = "6f0a1d8846ed7fa4c2b66da3eb252aa03d27170258df...",
)

cc_library(
  name = "CLI11",
  hdrs = ["@CLI11//file"],
  strip_include_prefix = "/external/CLI11/file",
  include_prefix = "CLI11",
  linkstatic = True,
  visibility = ["//visibility:public"],
)

#include <iostream>

#include "CLI11/CLI11.hpp"
#include "square/square.h"

int main() {
  std::cout << "Hello, bazel!" << std::endl;
  std::cout << Square(2) << std::endl;
  return 0;
}

उदाहरण 5. लिपियों और स्वचालन

py_binary(
  name = "perf_tests",
  srcs = ["perf_tests.py"],
  data = [
    "//main:hello_world",
  ],
)

import subprocess
import time

start_time = time.time()
process = subprocess.run(['main/hello_world, 'param1', ],
                         stdout=subprocess.PIPE,
                         universal_newlines=True)
end_time = time.time()
print("--- %s seconds ---" % (end_time - start_time))

bazel run //perf-tests:perf_tests

निष्कर्ष और क्या छुआ नहीं है