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c++/1209: Enums as template parameters produce "can't find class" errors
- From: ervan at tharas dot com
- To: gdb-gnats at sources dot redhat dot com
- Cc: ramesh at tharas dot com
- Date: 13 May 2003 01:07:12 -0000
- Subject: c++/1209: Enums as template parameters produce "can't find class" errors
- Reply-to: ervan at tharas dot com
>Number: 1209
>Category: c++
>Synopsis: Enums as template parameters produce "can't find class" errors
>Confidential: no
>Severity: non-critical
>Priority: medium
>Responsible: unassigned
>State: open
>Class: sw-bug
>Submitter-Id: net
>Arrival-Date: Tue May 13 01:08:01 UTC 2003
>Closed-Date:
>Last-Modified:
>Originator: Ervan Darnell
>Release: 5.3
>Organization:
>Environment:
Red Hat Linux on i686 and using g++ 3.2.2 both to compile gdb
and the test program.
>Description:
When an integer-style template parameter is specified with
an enum, the demangler sees the integer value but the stabs
encodes the enum name. For instance:
enum GNetConn { GSimpleNetConn, GLongNetConn };
template <GNetConn T>
class Sub2 : public Base { ....
Will cause the stabs to have Sub2<GsimpleNetConn> but the
demangling will report Sub2<(GNetConn) 0>. While logically
the same, gdb cannot find the correct class based on the
(GNetConn) 0 cast:
warning: can't find class named `SubSub<(GNetConn)0>', as given by C++ RTTI
and it fails completely to print anything (the full
attached example has another level of subclassing).
Even when the proper cast is explicitly given, it still reports
the error, but at least it works:
p *(SubSub<GSimpleNetConn>*)z
warning: can't find class named `SubSub<(GNetConn)0>', as given by C++ RTTI
warning: can't find class named `SubSub<(GNetConn)0>', as given by C++ RTTI
$7 = warning: can't find class named `SubSub<(GNetConn)0>', as given by C++ RTTI
{<Sub2<GSimpleNetConn>> = {<Base> = {_vptr.Base = 0x8049af0, i = 6},
k = 6}, t = 5}
This bears some resemblance to PR.488.
>How-To-Repeat:
g++ -g gdbprob.cc
gdb ./a.out
then breakpoint in foo and print argument z. The attachment
contains the full gdb interaction.
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
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