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Re: Referencing C++ functions with non-demangled names.
- To: gdb at sourceware dot cygnus dot com
- Subject: Re: Referencing C++ functions with non-demangled names.
- From: "Daniel Manfis" <dany_100 at yahoo dot com>
- Date: Tue, 22 May 2001 13:15:02 +0200
- References: <3B0987CD.7848.1387DF@localhost> ("Daniel Manfis"'s message of "Mon, 21 May 2001 21:25:33 +0200")
- Reply-to: dany_100 at yahoo dot com
> Errr, I need a test case, it works fine here.
> I also need to know what compiler version, etc, you are using.
linux : Mandrake 7.2 (kernel 2.2.17-21mdk)
gcc : 3.0, snapshot 20010423
gdb : 5.0 (RPM from/for Mandrake 7.2)
test case:
//////////////////////////////////////////////////////////////////////
// File name : a.cc
void f() {}
int main()
{
f() ;
}
//////////////////////////////////////////////////////////////////////
I compile with one of the following options, all of them give the
same results:
g++ -ggdb3 a.cc
g++ -g3 a.cc
g++ -gstabs+3 a.cc
> The workaround is to quote it, or remove the filename: from the
> front (or both). C++ functions with the same name must be the same
> function, by the one definition rule, so prefixing it like that is
> pointless.
Here is what i tried to do to set a breakpoint on functoin 'f', all
of the methods failing:
break a.cc:f
break 'a.cc:f'
break f
break 'f'
(i couldn't use double-quotes: when i try to do that (break "f"),
gdb crashes with segmentation fault (as it is, by the way, when you
type "break .")).
But i could set a breakpoint on 'f' function with the following
expression:
break _Z1fv
The only function breakpoint i could set using function's non-mangled
name, is the 'main' function breakpoint (using "break main"
expression. Probably the reason i succeeded to set breakpoint on
'main' with it's non-mangled name, is because it's name is not
mangled (at least when i step through the program, gdb never prints
'main''s name in a mangled form, as it does with all the other C++
functions).
Also, i couldn't set breakpoints on functions in a namespaces unless
i use it's mangled name, a notation like "break 'ns::f'" won't do
(instead, provided there is function 'f' in a namespace 'ns', i have
to use "break _ZN2ns1fEv") Generally, namespaces are not recognized
at all. For example, if i type "break ns::" and press <ESC-?>,
instead of displaying functions from that namespace, all functions in
the scope are displayed (as it happens when you type "break" and
press <ESC-?>).
I thought that maybe there is a problem with gdb's RPM package i am
using, but it is impossible for me to check - i barely have a space
to ungzip a source package, let along build it.
Daniel.
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