From 2d099cd8c5cb1598d6e911c0b389132ebc7c101b Mon Sep 17 00:00:00 2001
From: Dale Hamel <dale.hamel@shopify.com>
Date: Tue, 11 Feb 2020 21:10:52 -0500
Subject: [PATCH] Allow specifying clang base directory

---
 CMakeLists.txt | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7bd0f3b2716c..f1916b55caa8 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -43,6 +43,11 @@ find_package(LLVM REQUIRED CONFIG)
 message(STATUS "Found LLVM: ${LLVM_INCLUDE_DIRS} ${LLVM_PACKAGE_VERSION}")
 find_package(LibElf REQUIRED)
 
+if(CLANG_DIR)
+  set(CMAKE_FIND_ROOT_PATH "${CLANG_DIR}")
+  include_directories("${CLANG_DIR}/include")
+endif()
+
 # clang is linked as a library, but the library path searching is
 # primitively supported, unlike libLLVM
 set(CLANG_SEARCH "/opt/local/llvm/lib;/usr/lib/llvm-3.7/lib;${LLVM_LIBRARY_DIRS}")