多个 Bazel BUILD 文件出错："Target 'bar' is not visible from target 'foo'"

Question

我的项目结构如下：

$ tree
.
├── bar
│   ├── bar.cpp
│   └── BUILD
├── BUILD
├── foo.cpp
└── WORKSPACE

./BUILD的内容：

cc_binary(
    name = "foo",
    srcs = [ "foo.cpp" ],
    deps = [ "//bar" ],
)

bar/BUILD的内容：

cc_library(
    name = "bar",
    srcs = ["bar.cpp"],
)

如果我构建 foo，我会收到以下错误：

Target '//bar:bar' is not visible from target '//:foo'. Check the visibility declaration of the former target if you think the dependency is legitimate.

我需要做什么才能解决依赖关系并成功构建 foo？

Answer 1

来自Bazel docs：

However, by default, build rules are private. This means that they can only be referred to by rules in the same BUILD file. [...] You can make a rule visibile to rules in other BUILD files by adding a visibility = level attribute.

在这种情况下，bar/BUILD 应如下所示：

cc_library(
    name = "bar",
    srcs = ["bar.cpp"],
    visibility = ["//__pkg__"],
)

附加行 visibility = ["//__pkg__"] 允许当前 WORKSPACE 中的所有 BUILD 文件访问目标 bar。

Answer 2

visibility = ["//__pkg__"] 对我不起作用。但我设法通过添加

使其工作

package(default_visibility = ["//visibility:public"])

作为 bar/BUILD 文件的第一行。

多个 Bazel BUILD 文件出错："Target 'bar' is not visible from target 'foo'"

Error with multiple Bazel BUILD files: "Target 'bar' is not visible from target 'foo'"

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