[PATCH] Remove environment variables from driver tests

[Steven Wu]

After some thoughts, I think the first patch works better to serve the purpose. Environmental variable SDKROOT can be important for other clang tests but dangerous to Driver test. It can pollute all the driver tests doesn't specify a default sysroot and causing target triple to mismatch.
My goal is to recommit r226005 which is reverted because Darwin bots has SDKROOT environment set.


REPOSITORY
  rL LLVM

http://reviews.llvm.org/D7135

Files:
  test/Driver/lit.local.cfg

Index: test/Driver/lit.local.cfg
===================================================================
--- test/Driver/lit.local.cfg
+++ test/Driver/lit.local.cfg
@@ -4,3 +4,13 @@
 config.substitutions.insert(0,
     ('%clang_cc1',
      """*** Do not use 'clang -cc1' in Driver tests. ***""") )
+
+driver_overwrite_env_vars = ['MACOSX_DEPLOYMENT_TARGET',
+                             'IPHONEOS_DEPLOYMENT_TARGET',
+                             'SDKROOT', 'CCC_OVERRIDE_OPTIONS',
+                             'CC_PRINT_OPTIONS', 'CC_PRINT_HEADERS',
+                             'CC_LOG_DIAGNOSTICS']
+
+for name in driver_overwrite_env_vars:
+  if name in config.environment:
+    del config.environment[name]

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