From 8cb127b8e45f8e8ed1a61cf0f2023837a364c19f Mon Sep 17 00:00:00 2001
From: Marek Roszko <mark.roszko@gmail.com>
Date: Thu, 4 Mar 2021 21:37:18 -0500
Subject: [PATCH] Change the msvc exception handling mode when using asm
 libcontext

---
 CMakeLists.txt | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3e20bc7615..b1691476d8 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -409,8 +409,19 @@ if( MSVC )
     string( APPEND CMAKE_CXX_FLAGS_RELEASE " /GF" )
     # Avoid fatal error because /GF + swig wrapper exceed standard obj file limits
     string( APPEND CMAKE_CXX_FLAGS " /bigobj" )
-    # /EHsc: ensure standard exception C++ unwinding is enabled
+
+    # Exception handling
+    # Remove the potential default EHsc option cmake doesnt allow us to remove easily
+    string( REPLACE "/EHsc" "" CMAKE_CXX_FLAGS ${CMAKE_CXX_FLAGS} )
+    if( KICAD_WIN32_CONTEXT_WINFIBER )
+    # /EHsc: ensure standard exception C++ unwinding is enabled, "extern C" can never throw exceptions
     string( APPEND CMAKE_CXX_FLAGS " /EHsc" )
+    else()
+    # the asm libcontext implementation a slight change of rules
+    # /EHs: ensure standard exception C++ unwinding is enabled, "extern C" MAY throw exceptions
+    string( APPEND CMAKE_CXX_FLAGS " /EHs" )
+    endif()
+
     foreach( type EXE SHARED MODULE)
         # /DEBUG: create PDB
         string( APPEND CMAKE_${type}_LINKER_FLAGS " /DEBUG /MANIFEST:NO" )