tree 98f3b28bf3d2da420a174bdcca9f5003ad4f1422
parent 6d41f7e1233da88714edaf3f21f88ff8023558f4
author Ying Wang <wangying@google.com> 1458696193 -0700
committer Ying Wang <wangying@google.com> 1458696193 -0700

Create empty .a on Darwin when there is no obj file.

On Darwin ar would fail if there is no object file to add.
We work around by adding a dummy.o to the .a and then deleting it.

Bug: 27800477
Change-Id: I68bbebea2726058c25863d7026a645a520d05167