From c07f1963bcc44e0c227b29d7c1dc2c1673d5f056 Mon Sep 17 00:00:00 2001
From: Michael Gottesman <mgottesman@apple.com>
Date: Wed, 29 Jun 2016 21:59:20 +0000
Subject: [PATCH] [ClangConfig] Unset some variables after we are done using
 them to configure ClangConfig.cmake.in files.

This ensures that the values do not bleed over in between computations. It may
make sense in the future to just refactor this code into functions to provide
"true scoping".

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@274179 91177308-0d34-0410-b5e6-96231b3b80d8
---
 cmake/modules/CMakeLists.txt | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/cmake/modules/CMakeLists.txt b/cmake/modules/CMakeLists.txt
index 6b655b0796..9c4b4bff72 100644
--- a/cmake/modules/CMakeLists.txt
+++ b/cmake/modules/CMakeLists.txt
@@ -14,6 +14,8 @@ configure_file(
   ${CMAKE_CURRENT_SOURCE_DIR}/ClangConfig.cmake.in
   ${clang_cmake_builddir}/ClangConfig.cmake
   @ONLY)
+set(CLANG_CONFIG_CMAKE_DIR)
+set(CLANG_CONFIG_EXPORTS_FILE)
 
 # Generate ClangConfig.cmake for the install tree.
 set(CLANG_CONFIG_CODE "
@@ -32,6 +34,9 @@ configure_file(
   ${CMAKE_CURRENT_SOURCE_DIR}/ClangConfig.cmake.in
   ${CMAKE_CURRENT_BINARY_DIR}/CMakeFiles/ClangConfig.cmake
   @ONLY)
+set(CLANG_CONFIG_CODE)
+set(CLANG_CONFIG_CMAKE_DIR)
+set(CLANG_CONFIG_EXPORTS_FILE)
 
 if (NOT LLVM_INSTALL_TOOLCHAIN_ONLY)
   install(EXPORT ClangTargets DESTINATION ${CLANG_INSTALL_PACKAGE_DIR})
-- 
2.50.1