从bazel中的config_setting获取变量
从bazel中的config_setting获取变量
提问于 2022-04-18 22:38:32
我定义了以下config_setting：
config_setting(
name = "perception_env",
values = {"perception": "true"},
)
print(perception_env)然而，我似乎不能打印变量，它说它不存在。
回答 1
Stack Overflow用户
回答已采纳
发布于 2022-04-19 01:29:13
config_setting仅用于在select()中选择不同的可能值。config_setting实际上没有值，它更多地是变量( Bazel标志、Starlark定义的标志、平台约束)及其值的关联。values属性基本上用于标志值(“感知”必须是bazel标志)。
例如,
config_setting(
name = "my_config_setting_opt",
values = {"compilation_mode": "opt"}
)
config_setting(
name = "config_setting_dbg",
values = {"compilation_mode": "dbg"}
)
config_setting(
name = "config_setting_fastbuild",
values = {"compilation_mode": "fastbuild"}
)
genrule(
name = "gen_out",
outs = ["out"],
cmd = select({
":my_config_setting_opt": "echo Opt mode > $@",
":config_setting_dbg": "echo Dbg mode > $@",
":config_setting_fastbuild": "echo Fastbuild mode > $@",
}),
)3 config_settings声明--compilation_mode标志的3种不同的关联，每个可能的值都有一个(参见https://bazel.build/docs/user-manual#compilation-mode)
然后，select()为select() gen_out的cmd属性声明3个不同的可能值。然后将--compilation_mode标志设置为不同的值，选择cmd的值：
$ bazel build out --compilation_mode=dbg && cat bazel-bin/out
INFO: Build option --compilation_mode has changed, discarding analysis cache.
INFO: Analyzed target //:out (0 packages loaded, 11 targets configured).
INFO: Found 1 target...
Target //:out up-to-date:
bazel-bin/out
INFO: Elapsed time: 0.145s, Critical Path: 0.01s
INFO: 2 processes: 1 internal, 1 linux-sandbox.
INFO: Build completed successfully, 2 total actions
Dbg mode
$ bazel build out --compilation_mode=opt && cat bazel-bin/out
INFO: Build option --compilation_mode has changed, discarding analysis cache.
INFO: Analyzed target //:out (0 packages loaded, 11 targets configured).
INFO: Found 1 target...
Target //:out up-to-date:
bazel-bin/out
INFO: Elapsed time: 0.111s, Critical Path: 0.01s
INFO: 2 processes: 1 internal, 1 linux-sandbox.
INFO: Build completed successfully, 2 total actions
Opt mode
$ bazel build out --compilation_mode=fastbuild && cat bazel-bin/out
INFO: Build option --compilation_mode has changed, discarding analysis cache.
INFO: Analyzed target //:out (0 packages loaded, 11 targets configured).
INFO: Found 1 target...
Target //:out up-to-date:
bazel-bin/out
INFO: Elapsed time: 0.145s, Critical Path: 0.01s
INFO: 1 process: 1 internal.
INFO: Build completed successfully, 1 total action
Fastbuild mode页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/71917759
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