From 5c878409e31f7943d661ad5544179a9ce8aeb2cd Mon Sep 17 00:00:00 2001
From: Antony Peacock <ant.peacock@gmail.com>
Date: Fri, 12 Apr 2024 10:26:57 +0100
Subject: [PATCH] Fix __cplusplus macro for Visual Studio (#237)

* Fix __cplusplus macro for Visual Studio

* Upgrade GTest

* Force rebuild of GTest to build with C++17 onwards support

* Reinstate cmake layout

* Test if fetched gtest correctly builds for C++17

* Manually build Gtest to work around fetching the wrong build from the Conan Index Centre

* Attemp to use pre-built GTest if available

* Test fix is backward compatible with prior versions

* Revert to latest version

* Force building GTest on Windows is still required
---
 cmake/compiler.cmake | 1 +
 1 file changed, 1 insertion(+)

diff --git a/cmake/compiler.cmake b/cmake/compiler.cmake
index 93323d71..8556d81b 100644
--- a/cmake/compiler.cmake
+++ b/cmake/compiler.cmake
@@ -30,6 +30,7 @@ target_link_libraries(MorpheusConfig
 
 target_compile_options(MorpheusConfig
     INTERFACE
+        $<$<CXX_COMPILER_ID:MSVC>:/Zc:__cplusplus> # https://devblogs.microsoft.com/cppblog/msvc-now-correctly-reports-__cplusplus/
         $<$<CXX_COMPILER_ID:MSVC>:${MSVC_WARNINGS}>
         $<$<CXX_COMPILER_ID:GNU>:${GCC_WARNINGS}>
         $<$<OR:$<CXX_COMPILER_ID:Clang>,$<CXX_COMPILER_ID:AppleClang>>:${CLANG_WARNINGS}>