| <p><code>List of <a href="../build-ref.html#labels">labels</a>; optional</code></p> |
| |
| <p> |
| A list of |
| <code><a href="platform.html#constraint_value">constraint_values</a></code> |
| that must be present in the execution platform for this target. This is in |
| addition to any constraints already set by the rule type. Constraints are used |
| to restrict the list of available execution platforms, see the description of |
| <a href="../toolchains.html#toolchain-resolution">toolchain resolution</a> for |
| details. |
| </p> |
| |
| <p> |
| This attribute is available only on <code><a href="general.html#genrule">genrule</a></code>, |
| <a href="shell.html">shell rules</a>, and all test rules (*_test). |
| </p> |