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I would like to create a struct that has a certain alignment. I would like to use the same struct definition for both GCC and VisualC++ compilers. In VisualC++, one typically does this: __declspec(align(32)) struct MyStruct { // ... }; In GCC, one typically does this: struct MyStruct { // ... } __attribute__ ((aligned (32))); I could of course create the appropriate macros to make this work: BEGIN_ALIGNED_STRUCT(32) struct { // ... } END_ALIGNED_STRUCT(32) ; And thus be able to handle both cases transparently, but here I have to duplicate the alignment constant ( 32 ), which I'd like to avoid. An alternative in GCC is to put the __attribute__ after the struct tag, as mentioned in the docs , like so: struct __attribute__ ((aligned (32))) MyStruct { // ... }; And thus I could make this type of syntax work: ALIGNED_STRUCT(32) MyStruct { // ... }; Does anyone have any better versions? Other ideas? I tried a little code searching, but didn't find anything too promising. Update: Based on @John's comment, here's another version that could work (I haven't compiled it, but the docs indicate it's an OK idea) struct MyStruct_Unaligned { // ... }; TYPEDEF_ALIGNED(32, MyStruct_Unaligned, MyStruct); // Would expand to one of: // // typedef __declspec(align(32)) MyStruct_Unaligned MyStruct; // // typedef struct __attribute__ ((aligned (32))) MyStruct_Unaligned MyStruct

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