Use sandboxed clang

Change-Id: I0b9b5b7940b441aba6c6214e621d8997feef90b1
diff --git a/tools/cpp/clang_3p6/x86_64-linux-gnu-gcc b/tools/cpp/clang_3p6/x86_64-linux-gnu-gcc
new file mode 100755
index 0000000..4fe1d67
--- /dev/null
+++ b/tools/cpp/clang_3p6/x86_64-linux-gnu-gcc
@@ -0,0 +1,6 @@
+#!/bin/bash --norc
+
+PATH="${BAZEL_OUTPUT_ROOT}external/clang_3p6_repo/usr/lib/gcc/x86_64-linux-gnu/4.9:$PATH" \
+  exec \
+  ${BAZEL_OUTPUT_ROOT}external/clang_3p6_repo/usr/bin/gcc \
+  "$@"