What is "compatibility for C ++ mangling"?

Question

A type

wint_tinstalls internally wchar.hthrough stddef.h, using the fact that it is __WINT_TYPE__already defined in the compiler by default. So, to change

typedef unsigned int wint_t;

at

typedef wchar_t wint_t;

we can use the following code at the beginning wchar.h

#undef __WINT_TYPE__
#define __WINT_TYPE__ wchar_t
#define WEOF (-1)

But this comment suggests that doing this "violates compatibility for C ++ mangling."

You cannot modify existing typedefs, such as wint_t, without breaking compatibility with ABI (even if you have the same size and subscription and, therefore, are ABI-compatible for C, changing the base type breaks compatibility for C ++ mangling).

So, why exactly this typedef cannot be changed and what is "compatibility for C ++ mangling"?

. wchar.h, wchar_t , wint_t?

Answer 1

, :

• ABI:
• Mangling

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ClassA_method, ClassA_method^String, ClassA_method^int

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Answer 2

, C ++ . "C/++".

C mangling , ABI . , , wchar_t .

++ wchar_t typedef.

Answer 3

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, , . , ARM, Keil, -, GCC Clang /, mangling.

this.

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