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Subject: Re: Cygwin 64 problem
To: cygwin AT cygwin DOT com, Girish Joglekar <girish53 AT gmail DOT com>
References: <CAGX=k3HczQGx=51xRwyKrwpKTMqaOVqxj+ud4UH=i1yCPAFGWQ AT mail DOT gmail DOT com> <cf5d53e0-2464-b191-af1b-192cfc0553d9 AT cornell DOT edu> <37067fb7-8250-5aff-ebb5-8abe6746c8f6 AT cornell DOT edu>
From: Ken Brown <kbrown AT cornell DOT edu>
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Date: Sun, 4 Dec 2016 10:59:03 -0500
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On 11/29/2016 3:14 PM, Ken Brown wrote:
> I've looked at this a little, and the crash occurs because of a bad value of a pointer to a font list.  I'm attaching an annotated transcript of a gdb session that illustrates this.  I didn't try to figure out where the bad pointer came from.

I've done that now.  There are three places in mosprshx.c where you cast a pointer to a pointer to an object of a different size.  Interesting things happen when you dereference that pointer.  The following patch gets rid of the crash:

--- mosprshx.c~ 2016-12-04 10:02:36.706325200 -0500
+++ mosprshx.c  2016-12-04 10:28:35.160038200 -0500
@@ -235,7 +235,7 @@
    }
    XtSetArg(al[ac],XmNcolumns,longestFixedColumnSize+1); ac++;
    if(toValue.addr) {
-      XtSetArg(al[ac],XmNfontList,*(unsigned int *)toValue.addr); ac++;
+      XtSetArg(al[ac],XmNfontList,*(XtArgVal *)toValue.addr); ac++;
    }
    for(i1=0 ; i1<nRows ; i1++) {
       sprintf(widgetName,"fixedColumnRow%d",i1);
@@ -265,7 +265,7 @@
       XtSetArg(al[ac],XmNcolumns,cellSize); ac++;
    }
    if(toValue.addr) {
-      XtSetArg(al[ac],XmNfontList,*(unsigned int *)toValue.addr); ac++;
+      XtSetArg(al[ac],XmNfontList,*(XtArgVal *)toValue.addr); ac++;
    }
    for(j1=0 ; j1<nColumns ; j1++) {
       sprintf(widgetName,"fixedRowColumn%d",j1);
@@ -295,7 +295,7 @@
             XtSetArg(al[ac],XmNmaxLength,cellSize); ac++;
          }
          if(toValue.addr) {
-            XtSetArg(al[ac],XmNfontList,*(unsigned int *)toValue.addr); ac++;
+            XtSetArg(al[ac],XmNfontList,*(XtArgVal *)toValue.addr); ac++;
          }
          sprintf(widgetName,"column%drow%d",j1,i1);
          variableRowAndColumnTF[loc] = XmCreateTextField(variableColumnFM[j1],widgetName,al,ac); loc++;


Ken

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