Packed unaligned_type (#989)

This way, unaligned_types like etl::be_uint32_t can be used in places where POD types are expected.
ETLCPP · Dec 14, 2024 · 84eea5b · 84eea5b
1 parent 99d7537
commit 84eea5b
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diff --git a/include/etl/platform.h b/include/etl/platform.h
@@ -454,6 +454,14 @@ SOFTWARE.
   #define ETL_HAS_INITIALIZER_LIST 0
 #endif
 
+//*************************************
+// Determine if the ETL should use __attribute__((packed).
+#if defined(ETL_COMPILER_CLANG) || defined(ETL_COMPILER_GCC) || defined(ETL_COMPILER_INTEL)
+  #define ETL_PACKED __attribute__((packed))
+#else
+  #define ETL_PACKED
+#endif
+
 //*************************************
 // Check for availability of certain builtins
 #include "profiles/determine_builtin_support.h"

diff --git a/include/etl/unaligned_type.h b/include/etl/unaligned_type.h
@@ -227,7 +227,7 @@ namespace etl
   ///\tparam Endian The endianness of the arithmetic type.
   //*************************************************************************
   template <typename T, int Endian_>
-  class unaligned_type : public private_unaligned_type::unaligned_type_common<sizeof(T)>
+  class ETL_PACKED unaligned_type : public private_unaligned_type::unaligned_type_common<sizeof(T)>
   {
   public: