ci: support C++23

.github/workflows/android.yml

@@ -14,7 +14,7 @@ jobs:
     strategy:
       fail-fast: true
       matrix:
-        std: [14, 17, 20]
+        std: [14, 17, 20, 23]
         abi: [arm64-v8a, armeabi-v7a, x86_64, x86]
         build_type: [Debug, Release]
 

.github/workflows/emscripten.yml

@@ -15,7 +15,7 @@ jobs:
       matrix:
         build_type: [Release, Debug]
         lib: [static]
-        std: [14, 17, 20]
+        std: [14, 17, 20, 23]
 
     steps:
       - uses: actions/checkout@v3

.github/workflows/linux.yml

@@ -14,7 +14,7 @@ jobs:
       matrix:
         build_type: [Release, Debug]
         lib: [shared, static]
-        std: [14, 17, 20]
+        std: [14, 17, 20, 23]
 
     steps:
       - uses: actions/checkout@v3

.github/workflows/macos.yml

@@ -9,7 +9,7 @@ jobs:
     strategy:
       fail-fast: true
       matrix:
-        std: [14, 17, 20]
+        std: [14, 17, 20, 23]
         include:
           - generator: Ninja
           - build_type: Debug

.github/workflows/windows.yml

@@ -19,7 +19,7 @@ jobs:
         build_type: [Debug, Release]
         lib: [shared, static]
         msvc: [VS-16-2019, VS-17-2022]
-        std: [14, 17, 20]
+        std: [14, 17, 20, 23]
         include:
           - msvc: VS-16-2019
             os: windows-2019
@@ -138,7 +138,7 @@ jobs:
       matrix:
         build_type: [Debug]
         lib: [shared, static]
-        std: [14, 17, 20]
+        std: [14, 17, 20, 23]
         sys: [mingw32, mingw64]
         include:
          - sys: mingw32

src/logging.cc

@@ -33,8 +33,10 @@
 
 #include <algorithm>
 #include <cassert>
+#include <cstddef>
 #include <iomanip>
 #include <string>
+
 #ifdef HAVE_UNISTD_H
 # include <unistd.h>  // For _exit.
 #endif
@@ -1552,9 +1554,15 @@ static LogMessage::LogMessageData fatal_msg_data_shared;
 // allocations).
 static thread_local bool thread_data_available = true;
 
+#if defined(__cpp_lib_byte) && __cpp_lib_byte >= 201603L
+// std::aligned_storage is deprecated in C++23
+alignas(LogMessage::LogMessageData) static std::byte
+    thread_msg_data[sizeof(LogMessage::LogMessageData)];
+#else   // !(defined(__cpp_lib_byte) && __cpp_lib_byte >= 201603L)
 static thread_local std::aligned_storage<
     sizeof(LogMessage::LogMessageData),
     alignof(LogMessage::LogMessageData)>::type thread_msg_data;
+#endif  // defined(__cpp_lib_byte) && __cpp_lib_byte >= 201603L
 #endif  // defined(GLOG_THREAD_LOCAL_STORAGE)
 
 LogMessage::LogMessageData::LogMessageData()