emulators/rpcs3: unbreak on FreeBSD 10.4/11.1

Utilities/types.h:94:13: error: no member named 'byte' in namespace 'std'
        using std::byte;
              ~~~~~^
Utilities/types.h:773:18: error: no type named 'byte' in namespace 'std'
        alignas(A) std::byte data[S];
                   ~~~~~^
rpcs3/Emu/RSX/rsx_utils.h:9:10: fatal error: 'optional' file not found
 #include <optional>
          ^~~~~~~~~~
rpcs3/Emu/RSX/Overlays/overlay_controls.h:1354:20: error: no member named 'clamp' in namespace 'std'
                                m_value = std::clamp(value, 0.f, m_limit);
                                          ~~~~~^

Reported by:	pkg-fallout
Pointy hat to:	jbeich

2 files changed, 107 insertions, 0 deletions

diff --git a/emulators/rpcs3/Makefile b/emulators/rpcs3/Makefile
index f2044ce3daaa..fb04d17fc1ef 100644
--- a/emulators/rpcs3/Makefile
+++ b/emulators/rpcs3/Makefile
@@ -42,6 +42,9 @@ USE_QT=		qmake_build buildtools_build core dbus gui network widgets qml
 USE_XORG=	x11
 CMAKE_ON=	CMAKE_SKIP_RPATH USE_SYSTEM_FFMPEG USE_SYSTEM_LIBPNG
 CMAKE_OFF=	USE_NATIVE_INSTRUCTIONS
+EXTRA_PATCHES+=	${EXTRA_PATCHES_${COMPILER_FEATURES:Mlib*}_${OPSYS}_${OSREL}}
+EXTRA_PATCHES_libc++_FreeBSD_10.4=	${PATCHDIR}/extra-patch-c++14
+EXTRA_PATCHES_libc++_FreeBSD_11.1=	${PATCHDIR}/extra-patch-c++14
 CXXFLAGS+=	-D_GLIBCXX_USE_C99 # XXX ports/193528
 CXXFLAGS+=	-Wno-macro-redefined # __STDC_*_MACROS sys/cdefs.h vs. llvm-config
 LDFLAGS+=	-Wl,--as-needed # GLU
diff --git a/emulators/rpcs3/files/extra-patch-c++14 b/emulators/rpcs3/files/extra-patch-c++14
new file mode 100644
index 000000000000..5cbc8b8a2161
--- /dev/null
+++ b/emulators/rpcs3/files/extra-patch-c++14
@@ -0,0 +1,104 @@
+Downgrade to C++14 as libc++ < 5 doesn't support std::byte
+
+--- Utilities/BEType.h.orig	2018-08-27 18:53:45 UTC
++++ Utilities/BEType.h
+@@ -334,10 +334,14 @@ inline v128 operator~(const v128& other)
+ template <typename T, std::size_t Align, std::size_t Size>
+ struct se_storage
+ {
++#if __cplusplus < 201703L
++	using type = std::aligned_storage_t<Size, Align>;
++#else
+ 	struct type
+ 	{
+ 		alignas(Align) std::byte data[Size];
+ 	};
++#endif
+ 
+ 	// Unoptimized generic byteswap for unaligned data
+ 	static void reverse(u8* dst, const u8* src)
+--- Utilities/types.h.orig	2018-08-27 18:53:45 UTC
++++ Utilities/types.h
+@@ -91,7 +91,11 @@ using steady_clock = std::conditional<
+ 
+ namespace gsl
+ {
++#if __cplusplus < 201703L
++	enum class byte : u8;
++#else
+ 	using std::byte;
++#endif
+ }
+ 
+ // Formatting helper, type-specific preprocessing for improving safety and functionality
+@@ -120,6 +124,8 @@ class atomic_t;
+ 
+ #if defined(__INTELLISENSE__) && !defined(_MSC_VER)
+ namespace std { template <typename...> using void_t = void; }
++#elif defined(_LIBCPP_VERSION) && __cplusplus < 201703L
++namespace std { template <class...> using void_t = void; }
+ #endif
+ 
+ // Extract T::simple_type if available, remove cv qualifiers
+@@ -770,7 +776,11 @@ struct value_hash
+ template <template <typename> class TT, std::size_t S, std::size_t A = S>
+ struct alignas(A) any_pod
+ {
++#if __cplusplus < 201703L
++	std::aligned_storage_t<S, A> data;
++#else
+ 	alignas(A) std::byte data[S];
++#endif
+ 
+ 	any_pod() = default;
+ 
+--- rpcs3/CMakeLists.txt.orig	2018-08-27 18:53:45 UTC
++++ rpcs3/CMakeLists.txt
+@@ -2,7 +2,7 @@ cmake_minimum_required(VERSION 3.1)
+ 
+ set(CMAKE_MODULE_PATH "${CMAKE_CURRENT_LIST_DIR}/cmake_modules")
+ set(RES_FILES "")
+-set(CMAKE_CXX_STANDARD 17)
++set(CMAKE_CXX_STANDARD 14)
+ include(CheckCXXCompilerFlag)
+ 
+ # Qt section
+--- rpcs3/Emu/RSX/rsx_utils.h.orig	2018-08-27 18:53:45 UTC
++++ rpcs3/Emu/RSX/rsx_utils.h
+@@ -6,7 +6,19 @@
+ #include <atomic>
+ #include <memory>
+ #include <bitset>
++#if __cplusplus < 201703L
++#include <optional.hpp>
++#else
+ #include <optional>
++#endif
++
++#if __cplusplus < 201703L
++namespace std
++{
++	template<class T>
++	using optional = experimental::optional<T>;
++}
++#endif
+ 
+ extern "C"
+ {
+--- rpcs3/stdafx.h.orig	2018-08-27 18:53:45 UTC
++++ rpcs3/stdafx.h
+@@ -45,3 +45,14 @@ namespace std { inline namespace literals { inline nam
+ #include <algorithm>
+ 
+ using namespace std::literals;
++
++#if __cplusplus < 201703L
++namespace std
++{
++	template<typename T>
++	constexpr const T clamp(const T value, const T min, const T max)
++	{
++		return value < min ? min : value > max ? max : value;
++	}
++}
++#endif