我无法使用 bazel 正确添加外部依赖项

Question

我正在尝试使用 Bazel 测试“Hello World”C++ 项目。

我有以下项目结构：

WORKSPACE
/dependencies
  BUILD
  BUILD.gtest
/test
  BUILD

WORKSPACE 具有以下结构：

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

# gtest
http_archive(
    name = "gtest",
    url = "https://github.com/google/googletest/archive/release-1.10.0.zip",
    sha256 = "94c634d499558a76fa649edb13721dce6e98fb1e7018dfaeba3cd7a083945e91",
    build_file = "@//dependencies:BUILD.gtest",
    strip_prefix = "googletest-release-1.10.0",
)

BUILD.gtest 具有以下结构：

cc_library(
    name = "main",
    srcs = glob(
        ["src/*.cc"],
        exclude = ["src/gtest-all.cc"]
    ),
    hdrs = glob([
        "include/**/*.h",
        "src/*.h"
    ]),
    copts = ["-Iexternal/gtest/include"],
    linkopts = ["-pthread"],
    visibility = ["//visibility:public"],
)

test BUILD 具有以下结构：

cc_test(
  name = "unittests",
  srcs = ["scanner_test.cc"],
  copts = ["-Iexternal/gtest/include"],
  deps = [
   "//scanner:scanner",
   "@gtest//:main"
  ]
)

当我执行

bazel build //test:unittests

我明白了

INFO: Analyzed target //test:unittests (26 packages loaded, 315 targets configured).
INFO: Found 1 target...
ERROR: ../test/BUILD:1:8: Compiling test/scanner_test.cc failed: (Exit 1): gcc failed: error executing command /usr/bin/gcc -U_FORTIFY_SOURCE -fstack-protector -Wall -Wunused-but-set-parameter -Wno-free-nonheap-object -fno-omit-frame-pointer '-std=c++0x' -MD -MF ... (remaining 25 argument(s) skipped)

Use --sandbox_debug to see verbose messages from the sandbox
test/scanner_test.cc:1:10: fatal error: gtest/gtest.h: No such file or directory
    1 | #include "gtest/gtest.h"
      |          ^~~~~~~~~~~~~~~
compilation terminated.
Target //test:unittests failed to build
Use --verbose_failures to see the command lines of failed build steps.
INFO: Elapsed time: 2.314s, Critical Path: 0.08s
INFO: 2 processes: 2 internal.
FAILED: Build did NOT complete successfully

Answer 1

不需要文件 BUILD.gtest。

WORKSPACE.bazel:

workspace(name = "GTestDemo")

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

http_archive(
  name = "gtest",
  url = "https://github.com/google/googletest/archive/release-1.10.0.tar.gz",
  sha256 = "9dc9157a9a1551ec7a7e43daea9a694a0bb5fb8bec81235d8a1e6ef64c716dcb",
  strip_prefix = "googletest-release-1.10.0",
)

BUILD.bazel:

cc_test(
    name = "tests",
    srcs = ["test.cpp"],
    deps = [
        "@gtest//:gtest",
        "@gtest//:gtest_main",
    ],
)

test.cpp:

#include <iostream>
#include <fstream>

#include "gtest/gtest.h"

using namespace std;

TEST(sample_test_case, sample_test) {
    EXPECT_EQ(1, 1);
}

使用 Bazel 测试 4.1.0。

Answer 2

正如其他答案提到的：

The file BUILD.gtest is not needed.

因为gtest repo/release archive已经提供了一个

你自己的行为不像你预期的那样的原因是你试图通过操纵 copts 来指向 headers，这仅适用于构建一个特定的 cc_library 目标（来自链接文档）：

The flags take effect only for compiling this target, not its dependencies, so be careful about header files included elsewhere.

而要将这些接口暴露给使用它的其他目标，您需要使用 includes（再次文档）：

Unlike COPTS, these flags are added for this rule and every rule that depends on it.

我无法使用 bazel 正确添加外部依赖项

I can't properly add external dependency with bazel

c++

googletest

bazel