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# Common scalar build settings.
## Overview
These definitions are only for use in Bazel built-in tools. In all
other cases, use flag type definitions from
github.com/bazelbuild/bazel-skylib/rules/common_settings.bzl.
<a name="basic-example"></a>
## Basic Example
### //tools/my_pkg/BUILD
```python
load("//tools/config:common_settings.bzl", "bool_flag")
bool_flag(
name = "experimental_new_behavior",
build_setting_default = False,
)
```
### //tools/my_pkg/myrule.bzl
```python
load("//tools/flags:flags.bzl", "BuildSettingInfo")
def _myrule_impl(ctx):
if ctx.attr._experimental_new_behavior[BuildSettingInfo].value:
...
...
myrule = rule(
implementation = _myrule_impl.
attrs = {
...
"_experimental_new_behavior": attr.label(
default = "//tools/my_pkg:experimental_new_behavior"),
},
)
```
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