6.37.3 i386 Type Attributes

Two attributes are currently defined for i386 configurations: ms_struct and gcc_struct.

ms_struct

gcc_struct

If packed is used on a structure, or if bit-fields are used it may be that the Microsoft ABI packs them differently than GCC normally packs them. Particularly when moving packed data between functions compiled with GCC and the native Microsoft compiler (either via function call or as data in a file), it may be necessary to access either format.

Currently ‘-m[no-]ms-bitfields’ is provided for the Microsoft Windows X86 compilers to match the native Microsoft compiler.

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