// g++ 1.37.1 bug 900227_01 // g++ allows pointer type values to be converted to integral types which are // not actually large enough to hold the converted values. // Section 3.3.4 of the ANSI C standard says: // A pointer may be converted to an integral type. The size of the // integer required and the results are implementation defined. If // the space provided is not long enough, the behavior is undefined. // I believe that the only proper thing to do in such cases is to generate // errors. After all, if the converted value gets truncated, it is not // likely to be useful after that. // Furthermore, as the following example demonstrates, allowing pointers // to be converted to integral types which are not of sufficient size to // completely hold the converted values may cause additional troubles. // I tried the following code on 5 different machines and it failed on // all five (unless I also use the GNU assembler and the GNU linker). Three // of the five (Sun3, Sun4, and Symmetry) got link-time errors about byte // offset overflows. The other two (368/SystemV and AViiON) got assembly // time errors about relocatable names used in "constant" expressions. // keywords: casts, pointer types, integral types // Update 2/10/95: The compiler will now compute these expressions at // runtime. I think this is in the spirit of the GNU compilers (jason). // Special g++ Options: int main (); short s = (short) &main; // WARNING - small integer XFAIL h8*-*-* xstormy16-*-* char c = (char) &main; // WARNING - small integer int main () { return 0; }