tree bd6e45cbf0c1bdc2d01d66f9329e63d5d4b8cb53
parent 7918071584f6bf29c85f0e816ffd9879bbceaa5f
author klimek <klimek@google.com> 1438871896 +0200
committer Marcel Hlopko <hlopko@google.com> 1547020173 +0100

Feature configuration: add a field required_variables on flag_sets.

This allows to prevent expansion of flag sets based on whether build variables
are available. If required_variables is not set, and a variable that is
referenced in the flag_set's flags is not available, the build will fail.

We need the new behavior when some input files (for example profile data in
FDO enabled builds) are only available for a subset of the translation units of
a given target.

RELNOTES: None.
PiperOrigin-RevId: 100028996