From ae491f04a14195322821d565a66c49b68d238b32 Mon Sep 17 00:00:00 2001
From: Justin Lewis <cpluspluspython@gmail.com>
Date: Tue, 31 Aug 2021 05:07:49 -0500
Subject: [PATCH] Fixes build issue with LLVM on Windows with cmake (#10776)

LLVM fails to build on Windows with C++ 20 standard.  When building LLVM
on Windows, we use C++ 14 already.  This commit changes the c++ standard
to be picked by each subdirectory rather than the standard being picked
by the root level cmake file.
---
 3rdparty/CMakeLists.txt | 2 ++
 CMakeLists.txt          | 1 -
 rpcs3/CMakeLists.txt    | 2 ++
 3 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/3rdparty/CMakeLists.txt b/3rdparty/CMakeLists.txt
index 402c0cddfc..d5bea616c9 100644
--- a/3rdparty/CMakeLists.txt
+++ b/3rdparty/CMakeLists.txt
@@ -2,6 +2,8 @@ find_package(PkgConfig)
 include(ExternalProject)
 include(CMakeDependentOption)
 
+set(CMAKE_CXX_STANDARD 20)
+
 # Dummy target to use when lib isn't available
 add_library(3rdparty_dummy_lib INTERFACE)
 
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 9bced56586..f9b18ef691 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -26,7 +26,6 @@ option(USE_PRECOMPILED_HEADERS "Use precompiled headers" OFF)
 
 set(CMAKE_MODULE_PATH "${CMAKE_CURRENT_LIST_DIR}/buildfiles/cmake")
 
-set(CMAKE_CXX_STANDARD 20)
 include(CheckCXXCompilerFlag)
 
 if(NOT CMAKE_BUILD_TYPE)
diff --git a/rpcs3/CMakeLists.txt b/rpcs3/CMakeLists.txt
index fc4aa0aa4f..7a63931362 100644
--- a/rpcs3/CMakeLists.txt
+++ b/rpcs3/CMakeLists.txt
@@ -10,6 +10,8 @@ include(${CMAKE_CURRENT_SOURCE_DIR}/git-version.cmake)
 include(ConfigureCompiler)
 include(CheckFunctionExists)
 
+set(CMAKE_CXX_STANDARD 20)
+
 set(ADDITIONAL_LIBS "")
 if(CMAKE_SYSTEM MATCHES "Linux")
     #on some Linux distros shm_unlink and similar functions are in librt only