src/adiosFoam/write/adiosCoreWrite.C

@@ -5,7 +5,7 @@
     \\  /    A nd           | www.openfoam.com
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
-    Copyright (C) 2016-2023 OpenCFD Ltd.
+    Copyright (C) 2016-2025 OpenCFD Ltd.
 -------------------------------------------------------------------------------
 License
     This file is part of OpenFOAM.
@@ -29,8 +29,8 @@ License
 #include "adiosTime.H"
 #include "cloud.H"
 #include "foamVersion.H"
-#include "endian.H"
 #include "OSspecific.H"
+#include <cstdint>  // For endian information
 
 // * * * * * * * * * * * * * Private Member Functions * * * * * * * * * * * * //
 
@@ -201,15 +201,34 @@ void Foam::adiosFoam::adiosCoreWrite::putBaseAttributes()
     );
 
     // Endian type (LSB|MSB)
+    #ifdef __BYTE_ORDER__
+    // Clang, Gcc, Icc, and others
     putAttribute
     (
         adiosFoam::foamAttribute / "endian",
-#ifdef WM_LITTLE_ENDIAN
+        #if (__BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__)
         "LSB"
-#else
-        "MSB"
-#endif
+        #elif (__BYTE_ORDER__ == __ORDER_BIG_ENDIAN__)
+        "MSB";
+        #else
+        "mixed"
+        #endif
     );
+    #endif
+
+    // C++20
+    // if constexpr (std::endian::native == std::endian::big)
+    // {
+    //     putAttribute(adiosFoam::foamAttribute / "endian", "MSB");
+    // }
+    // else if constexpr (std::endian::native == std::endian::little)
+    // {
+    //     putAttribute(adiosFoam::foamAttribute / "endian", "LSB");
+    // }
+    // else
+    // {
+    //     putAttribute(adiosFoam::foamAttribute / "endian", "mixed");
+    // }
 
     // OpenFOAM label size (32|64)
     putIntAttribute