tree 14e725a298646fdd8e1952f3a64cfde1e11d4604
parent 5b56d19e343eea3d0e9874178053afe42ef40ae3
author Ben Dunbobbin <bd1976llvm@gmail.com> 1503075344 +0000
committer Ben Dunbobbin <bd1976llvm@gmail.com> 1503075344 +0000

[Support] env vars with empty values on windows

An environment variable can be in one of three states:

1. undefined.
2. defined with a non-empty value.
3. defined but with an empty value.

The windows implementation did not support case 3
(it was not handling errors). The Linux implementation
is already correct.

Differential Revision: https://reviews.llvm.org/D36394

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@311174 91177308-0d34-0410-b5e6-96231b3b80d8