From a8e070366a4df0106a743383616b9194bd129760 Mon Sep 17 00:00:00 2001
From: Chris Bieneman <chris.bieneman@me.com>
Date: Wed, 14 Aug 2019 18:26:37 +0000
Subject: [PATCH] [CMake] Fix cache invalidation of LLVM_CXX_STD

This cleans up fallout from https://reviews.llvm.org/D66195.

llvm-svn: 368897
---
 llvm/cmake/modules/HandleLLVMOptions.cmake | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/llvm/cmake/modules/HandleLLVMOptions.cmake b/llvm/cmake/modules/HandleLLVMOptions.cmake
index 37ef64f22dc2..893f2a247586 100644
--- a/llvm/cmake/modules/HandleLLVMOptions.cmake
+++ b/llvm/cmake/modules/HandleLLVMOptions.cmake
@@ -23,8 +23,11 @@ set(LLVM_CXX_STD_default "c++14")
 if (LLVM_ENABLE_CXX1Z)
   set(LLVM_CXX_STD_default "c++1z")
 endif()
+if (LLVM_CXX_STD STREQUAL "c++11")
+  set(LLVM_CXX_STD_force FORCE)
+endif()
 set(LLVM_CXX_STD ${LLVM_CXX_STD_default}
-    CACHE STRING "C++ standard to use for compilation.")
+    CACHE STRING "C++ standard to use for compilation." ${LLVM_CXX_STD_force})
 
 set(LLVM_ENABLE_LTO OFF CACHE STRING "Build LLVM with LTO. May be specified as Thin or Full to use a particular kind of LTO")
 string(TOUPPER "${LLVM_ENABLE_LTO}" uppercase_LLVM_ENABLE_LTO)