tree 5d4b4f660c25092a221e5a19dd50c1a98482fd82
parent 21054661ff04c31760c5b21f4fc338440e472ccf
author Daniel Dunbar <daniel_dunbar@apple.com> 1510027469 -0800
committer Daniel Dunbar <daniel_dunbar@apple.com> 1510027469 -0800

[BuildSystem] Don't propagate cancel state through phony commands.

 - When using phony commands to enforce ordering constraints, the cancelled
   state would incorrectly propagate through the phony command, thus causing
   unnecessary rebuilds of all downstream tasks. Instead, we

 - A more fundamental solution to this problem will be to adopt support for
   engine cancellation, and to ultimately allow individual commands to fail
   without reporting a result value (and then triggering engine termination).

 - <rdar://problem/35319783> Unnecessary rebuilds after an error