From 6baa1b06742ab247bd5e243d8eace81869c1f10c Mon Sep 17 00:00:00 2001
From: Braden Obrzut <admin@maniacsvault.net>
Date: Sat, 27 Feb 2016 02:20:34 -0500
Subject: [PATCH] - Compile with -std=c++14 or -std=c++11 on GCC/Clang. - Fixed
 initialization crossing goto.

---
 src/CMakeLists.txt | 26 +++++++++++++++++++++++++-
 src/p_map.cpp      |  3 ++-
 2 files changed, 27 insertions(+), 2 deletions(-)

diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 25a83fb94..b39221759 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -451,7 +451,7 @@ if( ZD_CMAKE_COMPILER_IS_GNUCXX_COMPATIBLE )
 		set( CMAKE_C_FLAGS_RELWITHDEBINFO "${CMAKE_C_FLAGS_RELWITHDEBINFO} -pg" )
 		set( CMAKE_CXX_FLAGS_RELWITHDEBINFO "${CMAKE_CXX_FLAGS_RELWITHDEBINFO} -pg" )
 	endif()
-	
+
 	set( REL_CXX_FLAGS "-fno-rtti" )
 	if( NOT PROFILE AND NOT APPLE )
 		# On OS X frame pointers are required for exception handling, at least with Clang
@@ -468,6 +468,30 @@ if( ZD_CMAKE_COMPILER_IS_GNUCXX_COMPATIBLE )
 	set( CMAKE_C_FLAGS "-Wall -Wextra -Wno-unused -Wno-unused-parameter -Wno-missing-field-initializers ${CMAKE_C_FLAGS}" )
 	set( CMAKE_CXX_FLAGS "-Wall -Wextra -Wno-unused -Wno-unused-parameter -Wno-missing-field-initializers ${CMAKE_CXX_FLAGS}" )
 
+	# Use the highest C++ standard available since VS2015 compiles with C++14
+	# but we only require C++11.  The recommended way to do this in CMake is to
+	# probably to use target_compile_features, but I don't feel like maintaining
+	# a list of features we use.
+	CHECK_CXX_COMPILER_FLAG( "-std=c++14" CAN_DO_CPP14 )
+	if ( CAN_DO_CPP14 )
+		set ( CMAKE_CXX_FLAGS "-std=c++14 ${CMAKE_CXX_FLAGS}" )
+	else ()
+		CHECK_CXX_COMPILER_FLAG( "-std=c++1y" CAN_DO_CPP1Y )
+		if ( CAN_DO_CPP1Y )
+			set ( CMAKE_CXX_FLAGS "-std=c++1y ${CMAKE_CXX_FLAGS}" )
+		else ()
+			CHECK_CXX_COMPILER_FLAG( "-std=c++11" CAN_DO_CPP11 )
+			if ( CAN_DO_CPP11 )
+				set ( CMAKE_CXX_FLAGS "-std=c++11 ${CMAKE_CXX_FLAGS}" )
+			else ()
+				CHECK_CXX_COMPILER_FLAG( "-std=c++0x" CAN_DO_CPP0X )
+				if ( CAN_DO_CPP0X )
+					set ( CMAKE_CXX_FLAGS "-std=c++0x ${CMAKE_CXX_FLAGS}" )
+				endif ()
+			endif ()
+		endif ()
+	endif ()
+
 	# Remove extra warnings when using the official DirectX headers.
 	# Also, TDM-GCC 4.4.0 no longer accepts glibc-style printf formats as valid,
 	# which is a royal pain. The previous version I had been using was fine with them.
diff --git a/src/p_map.cpp b/src/p_map.cpp
index 960c82f47..57b14997f 100644
--- a/src/p_map.cpp
+++ b/src/p_map.cpp
@@ -2137,7 +2137,8 @@ bool P_TryMove(AActor *thing, fixed_t x, fixed_t y,
 
 
 	// Check for crossed portals
-	bool portalcrossed = false;
+	bool portalcrossed;
+	portalcrossed = false;
 
 	while (true)
 	{