1 struct _XtTextSource { 2 /* ... */ 3 void (* SetSelection)(); 4 /* ... */ 5 }; 6 7 typedef struct _XtTextSource *XtTextSource; 8 9 typedef struct _TextPart { 10 XtTextSource source; 11 /* ... */ 12 } TextPart; 13 14 typedef struct _TextRec { 15 /* ... */ 16 TextPart text; 17 } TextRec; 18 19 typedef struct _TextRec *TextWidget; 20 21 XtTextUnsetSelection(w)22void XtTextUnsetSelection(w) 23 TextWidget w; /* original is: Widget w; */ 24 { 25 register TextWidget ctx = (TextWidget) w; 26 void (*nullProc)() = 0; 27 28 /* 29 * the following line causes the error, when optimizing: 30 */ 31 32 if (ctx->text.source->SetSelection != nullProc) { 33 34 foo(); 35 36 } 37 } 38