在Bazel中定义字典时使用选择 [英] Using select when defining a dict in Bazel

问题描述

在bazel中，我经常看到以下代码:

In bazel I often see following code:

srcs = [
        "foo/bar.c",
    ] + select({
        "@org_tensorflow//tensorflow:linux_x86_64": [
            "foo/baz.c",
        ],
        "//conditions:default": [],
    })

但是如何像这样有条件地附加dict?

But how do I go with conditionally appending a dict like this?

subs = {
        "#undef HWLOC_VERSION_MAJOR": "#define HWLOC_VERSION_MAJOR 2",
}

推荐答案

那是完全不直观的，但是我设法通过以下方式做到这一点:

That was completely non-intuitive, but I managed to do this in following way:

common_subs = {"foo": "bar"}

linux_subs = {"baz": "boo"}

subs = select({
  "@org_tensorflow//tensorflow:linux_x86_64": dict(common_subs, **linux_subs),
  "//conditions:default": common_subs,
})

我从Python中学到了**魔术.

I learned that ** magic from Python.

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