bool typedef and binary compatibility

I was poring over some source code and came across the following:

Code:

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/* Boolean type, assignment (but not necessarily binary) compatible with
 * C++ bool */
typedef enum {sox_false, sox_true} sox_bool;

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I understand that this code creates a boolean (true or false) datatype but what does the author mean by his comment on the lack of binary compatibility with C++ bool.

Does this mean that the C++ built-in bool usually compiles to a size of 1 byte whereas a C bool defined using and enumerated type is essentially an int and therefore usually 2 or 4 bytes in size?

Quote:

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Originally Posted by BattlePanic

Does this mean that the C++ built-in bool usually compiles to a size of 1 byte whereas a C bool defined using and enumerated type is essentially an int and therefore usually 2 or 4 bytes in size?

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I think that's what it means.

Yes, and enum's aren't necessarily binary compatible between different compilers, e.g. one compiler may decide to use short int (2 bytes), and another compiler uses a standard or long int (4 bytes).

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Mats