Bazel: how to specify --define in file?

user_4080347 0
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I hope this is a simple question :) In bazel, I can select a config_setting by specifying --define K=V passed from the command line. How can I create a library in my BUILD.bazel that "sets" this config_setting without the need to specify it from command line?

bazel
2 Answers

Defaults for flags can be set a .bazelrc file, for example:

build --define=VERSION=0.0.0-PLACEHOLDER
build --define=FOO=1

You can also have configuration sets too:

build:bar --define=VERSION=0.0.0-PLACEHOLDER
build:bar --define=FOO=1

The above would only become active when passing the --config=bar flag.

Flags passed on the command line will take precedence over those in the .bazelrc file.

It's worth mentioning though, that changing define values will cause bazel to analyze everything again, which depending on the graph may take some time, but only affected actions will be executed.

user_39386570

Some rules have an env argument, so you can do f.e.:

sh_binary(
  name = "target",
  ...
  env = {
    "K": "V"
  }
)
Sjoerd_Visscher_58520
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