As discussed on python-dev: this patch adds name mangling to

assure that extensions and interpreters using the Unicode APIs
were compiled using the same Unicode width.

Include/unicodeobject.h

@@ -129,6 +129,156 @@ typedef unsigned short Py_UCS2;
 
 typedef PY_UNICODE_TYPE Py_UNICODE;
 
+/* --- UCS-2/UCS-4 Name Mangling ------------------------------------------ */
+
+/* Unicode API names are mangled to assure that UCS-2 and UCS-4 builds
+   produce different external names and thus cause import errors in
+   case Python interpreters and extensions with mixed compiled in
+   Unicode width assumptions are combined. */
+
+#ifndef Py_UNICODE_WIDE
+
+# define PyUnicode_AsASCIIString PyUnicodeUCS2_AsASCIIString
+# define PyUnicode_AsCharmapString PyUnicodeUCS2_AsCharmapString
+# define PyUnicode_AsEncodedString PyUnicodeUCS2_AsEncodedString
+# define PyUnicode_AsLatin1String PyUnicodeUCS2_AsLatin1String
+# define PyUnicode_AsRawUnicodeEscapeString PyUnicodeUCS2_AsRawUnicodeEscapeString
+# define PyUnicode_AsUTF16String PyUnicodeUCS2_AsUTF16String
+# define PyUnicode_AsUTF8String PyUnicodeUCS2_AsUTF8String
+# define PyUnicode_AsUnicode PyUnicodeUCS2_AsUnicode
+# define PyUnicode_AsUnicodeEscapeString PyUnicodeUCS2_AsUnicodeEscapeString
+# define PyUnicode_AsWideChar PyUnicodeUCS2_AsWideChar
+# define PyUnicode_Compare PyUnicodeUCS2_Compare
+# define PyUnicode_Concat PyUnicodeUCS2_Concat
+# define PyUnicode_Contains PyUnicodeUCS2_Contains
+# define PyUnicode_Count PyUnicodeUCS2_Count
+# define PyUnicode_Decode PyUnicodeUCS2_Decode
+# define PyUnicode_DecodeASCII PyUnicodeUCS2_DecodeASCII
+# define PyUnicode_DecodeCharmap PyUnicodeUCS2_DecodeCharmap
+# define PyUnicode_DecodeLatin1 PyUnicodeUCS2_DecodeLatin1
+# define PyUnicode_DecodeRawUnicodeEscape PyUnicodeUCS2_DecodeRawUnicodeEscape
+# define PyUnicode_DecodeUTF16 PyUnicodeUCS2_DecodeUTF16
+# define PyUnicode_DecodeUTF8 PyUnicodeUCS2_DecodeUTF8
+# define PyUnicode_DecodeUnicodeEscape PyUnicodeUCS2_DecodeUnicodeEscape
+# define PyUnicode_Encode PyUnicodeUCS2_Encode
+# define PyUnicode_EncodeASCII PyUnicodeUCS2_EncodeASCII
+# define PyUnicode_EncodeCharmap PyUnicodeUCS2_EncodeCharmap
+# define PyUnicode_EncodeDecimal PyUnicodeUCS2_EncodeDecimal
+# define PyUnicode_EncodeLatin1 PyUnicodeUCS2_EncodeLatin1
+# define PyUnicode_EncodeRawUnicodeEscape PyUnicodeUCS2_EncodeRawUnicodeEscape
+# define PyUnicode_EncodeUTF16 PyUnicodeUCS2_EncodeUTF16
+# define PyUnicode_EncodeUTF8 PyUnicodeUCS2_EncodeUTF8
+# define PyUnicode_EncodeUnicodeEscape PyUnicodeUCS2_EncodeUnicodeEscape
+# define PyUnicode_Find PyUnicodeUCS2_Find
+# define PyUnicode_Format PyUnicodeUCS2_Format
+# define PyUnicode_FromEncodedObject PyUnicodeUCS2_FromEncodedObject
+# define PyUnicode_FromObject PyUnicodeUCS2_FromObject
+# define PyUnicode_FromUnicode PyUnicodeUCS2_FromUnicode
+# define PyUnicode_FromWideChar PyUnicodeUCS2_FromWideChar
+# define PyUnicode_GetDefaultEncoding PyUnicodeUCS2_GetDefaultEncoding
+# define PyUnicode_GetMax PyUnicodeUCS2_GetMax
+# define PyUnicode_GetSize PyUnicodeUCS2_GetSize
+# define PyUnicode_Join PyUnicodeUCS2_Join
+# define PyUnicode_Replace PyUnicodeUCS2_Replace
+# define PyUnicode_Resize PyUnicodeUCS2_Resize
+# define PyUnicode_SetDefaultEncoding PyUnicodeUCS2_SetDefaultEncoding
+# define PyUnicode_Split PyUnicodeUCS2_Split
+# define PyUnicode_Splitlines PyUnicodeUCS2_Splitlines
+# define PyUnicode_Tailmatch PyUnicodeUCS2_Tailmatch
+# define PyUnicode_Translate PyUnicodeUCS2_Translate
+# define PyUnicode_TranslateCharmap PyUnicodeUCS2_TranslateCharmap
+# define _PyUnicode_AsDefaultEncodedString _PyUnicodeUCS2_AsDefaultEncodedString
+# define _PyUnicode_Fini _PyUnicodeUCS2_Fini
+# define _PyUnicode_Init _PyUnicodeUCS2_Init
+# define _PyUnicode_IsAlpha _PyUnicodeUCS2_IsAlpha
+# define _PyUnicode_IsDecimalDigit _PyUnicodeUCS2_IsDecimalDigit
+# define _PyUnicode_IsDigit _PyUnicodeUCS2_IsDigit
+# define _PyUnicode_IsLinebreak _PyUnicodeUCS2_IsLinebreak
+# define _PyUnicode_IsLowercase _PyUnicodeUCS2_IsLowercase
+# define _PyUnicode_IsNumeric _PyUnicodeUCS2_IsNumeric
+# define _PyUnicode_IsTitlecase _PyUnicodeUCS2_IsTitlecase
+# define _PyUnicode_IsUppercase _PyUnicodeUCS2_IsUppercase
+# define _PyUnicode_IsWhitespace _PyUnicodeUCS2_IsWhitespace
+# define _PyUnicode_ToDecimalDigit _PyUnicodeUCS2_ToDecimalDigit
+# define _PyUnicode_ToDigit _PyUnicodeUCS2_ToDigit
+# define _PyUnicode_ToLowercase _PyUnicodeUCS2_ToLowercase
+# define _PyUnicode_ToNumeric _PyUnicodeUCS2_ToNumeric
+# define _PyUnicode_ToTitlecase _PyUnicodeUCS2_ToTitlecase
+# define _PyUnicode_ToUppercase _PyUnicodeUCS2_ToUppercase
+
+#else
+
+# define PyUnicode_AsASCIIString PyUnicodeUCS4_AsASCIIString
+# define PyUnicode_AsCharmapString PyUnicodeUCS4_AsCharmapString
+# define PyUnicode_AsEncodedString PyUnicodeUCS4_AsEncodedString
+# define PyUnicode_AsLatin1String PyUnicodeUCS4_AsLatin1String
+# define PyUnicode_AsRawUnicodeEscapeString PyUnicodeUCS4_AsRawUnicodeEscapeString
+# define PyUnicode_AsUTF16String PyUnicodeUCS4_AsUTF16String
+# define PyUnicode_AsUTF8String PyUnicodeUCS4_AsUTF8String
+# define PyUnicode_AsUnicode PyUnicodeUCS4_AsUnicode
+# define PyUnicode_AsUnicodeEscapeString PyUnicodeUCS4_AsUnicodeEscapeString
+# define PyUnicode_AsWideChar PyUnicodeUCS4_AsWideChar
+# define PyUnicode_Compare PyUnicodeUCS4_Compare
+# define PyUnicode_Concat PyUnicodeUCS4_Concat
+# define PyUnicode_Contains PyUnicodeUCS4_Contains
+# define PyUnicode_Count PyUnicodeUCS4_Count
+# define PyUnicode_Decode PyUnicodeUCS4_Decode
+# define PyUnicode_DecodeASCII PyUnicodeUCS4_DecodeASCII
+# define PyUnicode_DecodeCharmap PyUnicodeUCS4_DecodeCharmap
+# define PyUnicode_DecodeLatin1 PyUnicodeUCS4_DecodeLatin1
+# define PyUnicode_DecodeRawUnicodeEscape PyUnicodeUCS4_DecodeRawUnicodeEscape
+# define PyUnicode_DecodeUTF16 PyUnicodeUCS4_DecodeUTF16
+# define PyUnicode_DecodeUTF8 PyUnicodeUCS4_DecodeUTF8
+# define PyUnicode_DecodeUnicodeEscape PyUnicodeUCS4_DecodeUnicodeEscape
+# define PyUnicode_Encode PyUnicodeUCS4_Encode
+# define PyUnicode_EncodeASCII PyUnicodeUCS4_EncodeASCII
+# define PyUnicode_EncodeCharmap PyUnicodeUCS4_EncodeCharmap
+# define PyUnicode_EncodeDecimal PyUnicodeUCS4_EncodeDecimal
+# define PyUnicode_EncodeLatin1 PyUnicodeUCS4_EncodeLatin1
+# define PyUnicode_EncodeRawUnicodeEscape PyUnicodeUCS4_EncodeRawUnicodeEscape
+# define PyUnicode_EncodeUTF16 PyUnicodeUCS4_EncodeUTF16
+# define PyUnicode_EncodeUTF8 PyUnicodeUCS4_EncodeUTF8
+# define PyUnicode_EncodeUnicodeEscape PyUnicodeUCS4_EncodeUnicodeEscape
+# define PyUnicode_Find PyUnicodeUCS4_Find
+# define PyUnicode_Format PyUnicodeUCS4_Format
+# define PyUnicode_FromEncodedObject PyUnicodeUCS4_FromEncodedObject
+# define PyUnicode_FromObject PyUnicodeUCS4_FromObject
+# define PyUnicode_FromUnicode PyUnicodeUCS4_FromUnicode
+# define PyUnicode_FromWideChar PyUnicodeUCS4_FromWideChar
+# define PyUnicode_GetDefaultEncoding PyUnicodeUCS4_GetDefaultEncoding
+# define PyUnicode_GetMax PyUnicodeUCS4_GetMax
+# define PyUnicode_GetSize PyUnicodeUCS4_GetSize
+# define PyUnicode_Join PyUnicodeUCS4_Join
+# define PyUnicode_Replace PyUnicodeUCS4_Replace
+# define PyUnicode_Resize PyUnicodeUCS4_Resize
+# define PyUnicode_SetDefaultEncoding PyUnicodeUCS4_SetDefaultEncoding
+# define PyUnicode_Split PyUnicodeUCS4_Split
+# define PyUnicode_Splitlines PyUnicodeUCS4_Splitlines
+# define PyUnicode_Tailmatch PyUnicodeUCS4_Tailmatch
+# define PyUnicode_Translate PyUnicodeUCS4_Translate
+# define PyUnicode_TranslateCharmap PyUnicodeUCS4_TranslateCharmap
+# define _PyUnicode_AsDefaultEncodedString _PyUnicodeUCS4_AsDefaultEncodedString
+# define _PyUnicode_Fini _PyUnicodeUCS4_Fini
+# define _PyUnicode_Init _PyUnicodeUCS4_Init
+# define _PyUnicode_IsAlpha _PyUnicodeUCS4_IsAlpha
+# define _PyUnicode_IsDecimalDigit _PyUnicodeUCS4_IsDecimalDigit
+# define _PyUnicode_IsDigit _PyUnicodeUCS4_IsDigit
+# define _PyUnicode_IsLinebreak _PyUnicodeUCS4_IsLinebreak
+# define _PyUnicode_IsLowercase _PyUnicodeUCS4_IsLowercase
+# define _PyUnicode_IsNumeric _PyUnicodeUCS4_IsNumeric
+# define _PyUnicode_IsTitlecase _PyUnicodeUCS4_IsTitlecase
+# define _PyUnicode_IsUppercase _PyUnicodeUCS4_IsUppercase
+# define _PyUnicode_IsWhitespace _PyUnicodeUCS4_IsWhitespace
+# define _PyUnicode_ToDecimalDigit _PyUnicodeUCS4_ToDecimalDigit
+# define _PyUnicode_ToDigit _PyUnicodeUCS4_ToDigit
+# define _PyUnicode_ToLowercase _PyUnicodeUCS4_ToLowercase
+# define _PyUnicode_ToNumeric _PyUnicodeUCS4_ToNumeric
+# define _PyUnicode_ToTitlecase _PyUnicodeUCS4_ToTitlecase
+# define _PyUnicode_ToUppercase _PyUnicodeUCS4_ToUppercase
+
+
+#endif
+
 /* --- Internal Unicode Operations ---------------------------------------- */
 
 /* If you want Python to use the compiler's wctype.h functions instead