pending/1561: gdb 2004-02-20-cvs solaris fails to build "this" properly

["Robert R. Henry" <rrh at cray dot com>]

>Number:         1561
>Category:       pending
>Synopsis:       gdb 2004-02-20-cvs solaris fails to build "this" properly
>Confidential:   yes
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          change-request
>Submitter-Id:   unknown
>Arrival-Date:   Mon Feb 23 16:08:00 UTC 2004
>Closed-Date:
>Last-Modified:
>Originator:     
>Release:        
>Organization:
>Environment:
>Description:
 This describes a problem with gdb evaluating function member function calls
 from the "print" command.
 
 The gdb I'm using was built from the sourceforge cvs checkout
 2004-02-20-cvs, with gdb configured using
   ./configure --host=sparc64-sun-solaris2.8
 as built with gcc 3.2.2.
 
 Consider the program shown at the bottom. That program is compiled
 using g++ 3.2.2 -g.
 
 If I use the buggy gdb to put a breakpoint on the line "p->dump()",
 and then do:
   (gdb) print p
     $1 = 0x20be0
 and then use the print command to evaluate a call to p->dump()
   (gdb) print p->dump()
 it appears as if the formal parameter "this" in Thing::dump
 is initialized with a bogus actual parameter (0 in this case,
 but I've seen 1 in my real application)
 
     Program received signal SIGSEGV, Segmentation fault.
     0x0001084c in Thing::dump (this=0x0) at x.cc:20
     20        printf("a=%d\n", a);
     The program being debugged was signaled while in a function called from GDB.
     GDB remains in the frame where the signal was received.
     To change this behavior use "set unwindonsignal on"
     Evaluation of the expression containing the function (Thing::dump()) will be abandoned.
 
 
 #include <stdio.h>
 class Thing {
 private:
   int a;
   int b;
 public:
   Thing(void);
   ~Thing(void);
   void dump(void);
 };
 typedef Thing * ThingP;
 int main(void)
 {
   ThingP p = new Thing();
   p->dump();
   return 0;
 }
 void Thing::dump(void)
 {
   printf("a=%d\n", a);
   printf("b=%d\n", b);
 }
 Thing::Thing(void)
 {
   a = 0;
   b = 0;
 }
 Thing::~Thing(void)
 {
 }
 
 
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