调用llvm-config --prefix并在BUILD规则中使用它 [英] Call llvm-config --prefix and use it in a BUILD rule

问题描述

我在 WORKSPACE 中有以下规则:

new_local_repository(
    name = "llvm",
    path = "/opt/local/libexec/llvm-4.0",
    build_file= "llvm.BUILD")

我现在想对llvm使用硬编码路径. llvm-config --prefix可以给我llvm的目录.什么是正确的方法来做到这一点?我可以只使用标准的python命令(例如subprocess软件包)吗?

I would like to now use hardcoded path for llvm. llvm-config --prefix can give me the directory for llvm. What is the correct way to get this? Can I just use standard python commands (e.g. subprocess package)?

推荐答案

正如@abergmeier所说，您可以创建自定义存储库规则，运行命令，创建指向其输出的符号链接，并为存储库创建BUILD文件:

As @abergmeier said, you can create a custom repository rule, run the command, create a symlink pointing to its output, and create a BUILD file for the repository:

WORKSPACE文件:

WORKSPACE file:

workspace(name = "io_bazel")

load("//foo:repo.bzl", "llvm_configure")

llvm_configure(name = "local_config_llvm")

foo/repo.bzl:

foo/repo.bzl:

def _impl(repository_ctx):
  result = repository_ctx.execute(["echo", "/tmp/dummy/path"])
  llvm_path = result.stdout.splitlines()[0]
  repository_ctx.symlink(llvm_path, "llvm-4.0")
  repository_ctx.file("BUILD", """
filegroup(
    name = "llvm_files",
    srcs = glob(["llvm-4.0/**"]),
    visibility = ["//visibility:public"],
)
""")

llvm_configure = repository_rule(
    implementation=_impl,
    local = True,
    environ = [])

回购中的目标:

$ bazel query @local_config_llvm//:*
@local_config_llvm//:llvm_files
@local_config_llvm//:llvm-4.0/a.txt
@local_config_llvm//:BUILD

生成的文件:

$ ls -la $(bazel info output_base)/external/local_config_llvm
total 16
drwxr-x--- 2 laszlocsomor eng 4096 May 12 13:06 .
drwxr-x--- 6 laszlocsomor eng 4096 May 12 13:06 ..
-rwxr-x--x 1 laszlocsomor eng  115 May 12 13:06 BUILD
lrwxrwxrwx 1 laszlocsomor eng   15 May 12 13:06 llvm-4.0 -> /tmp/dummy/path
-rw-r----- 1 laszlocsomor eng  116 May 12 13:06 WORKSPACE


$ cat $(bazel info output_base)/external/local_config_llvm/BUILD

filegroup(
    name = "llvm_files",
    srcs = glob(["llvm-4.0/**"]),
    visibility = ["//visibility:public"],
)


$ cat $(bazel info output_base)/external/local_config_llvm/WORKSPACE
# DO NOT EDIT: automatically generated WORKSPACE file for llvm_configure rule
workspace(name = "local_config_llvm")

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