Those are GCC implementation details. In spite that in most cases implicit conversion from an integer (except a null pointer constant, of course) to a pointer should be considered a casual error, it is however required by the C standard: --- ISO/IEC WG14 N1570 Programming languages — C 6.3 Conversions 1 Several operators convert operand values from one type to another automatically. This subclause specifies the result required from such an _implicit conversion_, ... ... 6.3.2.3 Pointers 5 An integer may be converted to any pointer type. Except as previously specified, the result is implementation-defined, might not be correctly aligned, might not point to an entity of the referenced type, and might be a trap representation.67) --- Making it an error would make GCC not conform to the standard just because C is so broken. ------------------ Best regards, lh_mouse 2016-06-18 ------------------------------------------------------------- 发件人：Mason <mpeg.blue@xxxxxxx> 发送日期：2016-06-18 15:19 收件人：GCC help 抄送： 主题：Confusing error for incorrect struct initialization Hello, I opened bug 71552: Confusing error for incorrect struct initialization https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71552 I don't understand Martin's reply in comment #1. Could someone explain? Regards.
