Allow overriding the LLVM prebuilts path.
The automated build will need to do a two stage build, and we want to
do that without altering the source directory. Building with
`make LLVM_PREBUILTS_BASE=/path/to/prebuilts` will build using an
arbitrary toolchain instead of the installed one.
Bug: http://b/17441393
Change-Id: I4ff5c5224fbb8ebeb3a752907d6c4cd0a925aa1e
diff --git a/core/clang/config.mk b/core/clang/config.mk
index 03e8dd5..00815e4 100644
--- a/core/clang/config.mk
+++ b/core/clang/config.mk
@@ -1,7 +1,8 @@
## Clang configurations.
LLVM_PREBUILTS_VERSION := 3.8
-LLVM_PREBUILTS_PATH := prebuilts/clang/host/$(BUILD_OS)-x86/$(LLVM_PREBUILTS_VERSION)/bin
+LLVM_PREBUILTS_BASE := prebuilts/clang/host
+LLVM_PREBUILTS_PATH := $(LLVM_PREBUILTS_BASE)/$(BUILD_OS)-x86/$(LLVM_PREBUILTS_VERSION)/bin
LLVM_RTLIB_PATH := $(LLVM_PREBUILTS_PATH)/../lib/clang/$(LLVM_PREBUILTS_VERSION)/lib/linux/
CLANG := $(LLVM_PREBUILTS_PATH)/clang$(BUILD_EXECUTABLE_SUFFIX)