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From: mr3@ukc.ac.uk (M.Rizzo)
Newsgroups: comp.sys.amiga.programmer
Subject: Re: REVIEW:  Comeau C++ compiler
Keywords: programming, language, C++, compiler
Message-ID: <7511@harrier.ukc.ac.uk>
Date: 5 May 91 20:56:17 GMT
References: <37228@ditka.Chicago.COM> <7482@harrier.ukc.ac.uk> <38213@ditka.Chicago.COM>
Reply-To: mr3@ukc.ac.uk (M.Rizzo)
Organization: Computing Lab, University of Kent at Canterbury, UK.
Lines: 47

In article <38213@ditka.Chicago.COM> comeau@csanta.attmail.com (Greg Comeau) writes:
>In article <7482@harrier.ukc.ac.uk> mr3@ukc.ac.uk (M.Rizzo) writes:
>>With older versions of GNU gdb there was a small utility g++filt ...
>
>Comeau C++ comes with a utility we call c++filt, c++filt.CC, or
>comofilt depending upon the port (don't ask we why haven't standardized
>the name please) that supports just such a demangling capability.

Great stuff Greg! Why haven't you standardized the ... OOPS ! Sorry :-)

A few days back I mentioned GNU gdb problems with g++. Here's one of
them - it can't cast pointers properly with multiple inheritance (which
may require that the value of the pointer be changed as defined in ARM
pg 221). The following example demonstrates the problem

class A { int a; };

class B { int b; };

class C : public A, public B { };

main() {
        C* pc = new C;
        B* pb = pc;          // Implicit conversion here - add delta(B)
}

(gdb) br 10
Reading in symbols for demo.C...done.
Breakpoint 1 at 0x22e4: file demo.C, line 10.
(gdb) run
Starting program: /usr/nfs/nutmeg/d1/users/mr3/a.out

Bpt 1, main () (demo.C line 10)
10      }
(gdb) print pc
::1 = (struct C *) 0x6d50
(gdb) print pb
::2 = (B *) 0x6d54         | Implicit cast causes 4 bytes to be added
(gdb) print (B *) pc
::3 = (B *) 0x6d50         | Wrong ! Should be 0x6d54 as in ::2 above

Although I haven't used CodeProbe much (and the last time I used it was
ages ago) it should have the same problem debugging C++ code.

>- Greg

Michael Rizzo