commit 47adebef0df6dce752fe9a45e9190e8005b5d07c
author Benjamin Kramer <benny.kra@googlemail.com> Thu Sep 22 21:41:16 2011 +0000
committer Benjamin Kramer <benny.kra@googlemail.com> Thu Sep 22 21:41:16 2011 +0000
tree 096b430ad15076f1b5170b72de873de8ad45e207
parent 4cd06348a8c7b3559e9f437439dfc75ff7a04e88

Add support for CPATH and friends.

This moves the existing code for CPATH into the driver and adds the environment lookup and path splitting there.
The paths are then passed down to cc1 with -I options (CPATH), added after the normal user-specified include dirs.
Language specific paths are passed via -LANG-isystem and the actual filtering is performed in the frontend.

I tried to match GCC's behavior as close as possible

Fixes PR8971.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@140341 91177308-0d34-0410-b5e6-96231b3b80d8