From 4c9c94be5f42805e6e2a3256a145604f92832952 Mon Sep 17 00:00:00 2001
From: Alvin Wong <alvin@alvinhc.com>
Date: Mon, 21 Nov 2022 18:29:10 +0800
Subject: [PATCH 1/4] Add missing includes for GCC 12

---
 cppwinrt/pch.h          | 1 +
 cppwinrt/text_writer.h  | 1 +
 strings/base_includes.h | 1 +
 3 files changed, 3 insertions(+)

diff --git a/cppwinrt/pch.h b/cppwinrt/pch.h
index 335324767..e6a31443e 100644
--- a/cppwinrt/pch.h
+++ b/cppwinrt/pch.h
@@ -1,5 +1,6 @@
 #pragma once
 
+#include <utility>
 #include "cmd_reader.h"
 #include <winmd_reader.h>
 #include "task_group.h"
diff --git a/cppwinrt/text_writer.h b/cppwinrt/text_writer.h
index 50e6e6b15..3e210db83 100644
--- a/cppwinrt/text_writer.h
+++ b/cppwinrt/text_writer.h
@@ -6,6 +6,7 @@
 #include <sstream>
 #include <string>
 #include <string_view>
+#include <vector>
 
 namespace cppwinrt
 {
diff --git a/strings/base_includes.h b/strings/base_includes.h
index 10518a705..6a1af2e0e 100644
--- a/strings/base_includes.h
+++ b/strings/base_includes.h
@@ -6,6 +6,7 @@
 #include <charconv>
 #include <chrono>
 #include <cstddef>
+#include <cstring>
 #include <iterator>
 #include <map>
 #include <memory>

From b34c5e008d6b032640bbe4d337ace7678b274b6b Mon Sep 17 00:00:00 2001
From: Alvin Wong <alvin@alvinhc.com>
Date: Mon, 21 Nov 2022 18:29:15 +0800
Subject: [PATCH 2/4] Fix coroutine support check for GCC 12 and improve error
 reporting

`#include <version>` is needed before using `__cpp_lib_coroutine`, but
it is technically only available since C++20.
---
 strings/base_includes.h | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/strings/base_includes.h b/strings/base_includes.h
index 6a1af2e0e..54edca841 100644
--- a/strings/base_includes.h
+++ b/strings/base_includes.h
@@ -21,6 +21,10 @@
 #include <utility>
 #include <vector>
 
+#if __has_include(<version>)
+#include <version>
+#endif
+
 #if __has_include(<windowsnumerics.impl.h>)
 #define WINRT_IMPL_NUMERICS
 #include <directxmath.h>
@@ -51,7 +55,7 @@ namespace winrt::impl
     using suspend_never = std::suspend_never;
 }
 
-#else
+#elif __has_include(<experimental/coroutine>)
 
 #include <experimental/coroutine>
 
@@ -64,4 +68,6 @@ namespace winrt::impl
     using suspend_never = std::experimental::suspend_never;
 }
 
+#else
+#error C++/WinRT requires coroutine support, which is currently missing. Try enabling C++20 in your compiler.
 #endif

From 59e4607f87939b82c8c33aa6570e6985aff6f294 Mon Sep 17 00:00:00 2001
From: Alvin Wong <alvin@alvinhc.com>
Date: Mon, 21 Nov 2022 18:30:42 +0800
Subject: [PATCH 3/4] winrt::clock: Add time_point_cast for GCC 12

---
 strings/base_chrono.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/strings/base_chrono.h b/strings/base_chrono.h
index e8e5a1ee4..151246d46 100644
--- a/strings/base_chrono.h
+++ b/strings/base_chrono.h
@@ -47,7 +47,7 @@ WINRT_EXPORT namespace winrt
 
         static time_point from_time_t(time_t time) noexcept
         {
-            return from_sys(std::chrono::system_clock::from_time_t(time));
+            return std::chrono::time_point_cast<duration>(from_sys(std::chrono::system_clock::from_time_t(time)));
         }
 
         static file_time to_file_time(time_point const& time) noexcept

From 70a9a4e855528bf9e8f00e38503ba3d6e4071944 Mon Sep 17 00:00:00 2001
From: Alvin Wong <alvin@alvinhc.com>
Date: Mon, 21 Nov 2022 18:30:51 +0800
Subject: [PATCH 4/4] Specify std namespace when using nullptr_t

---
 strings/base_string_operators.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/strings/base_string_operators.h b/strings/base_string_operators.h
index f9701aa4b..b00150f92 100644
--- a/strings/base_string_operators.h
+++ b/strings/base_string_operators.h
@@ -55,9 +55,9 @@ WINRT_EXPORT namespace winrt
         return left < std::wstring_view(right);
     }
 
-    bool operator<(hstring const& left, nullptr_t) = delete;
+    bool operator<(hstring const& left, std::nullptr_t) = delete;
 
-    bool operator<(nullptr_t, hstring const& right) = delete;
+    bool operator<(std::nullptr_t, hstring const& right) = delete;
     inline bool operator!=(hstring const& left, hstring const& right) noexcept { return !(left == right); }
     inline bool operator>(hstring const& left, hstring const& right) noexcept { return right < left; }
     inline bool operator<=(hstring const& left, hstring const& right) noexcept { return !(right < left); }