There is no way for a program to refer to the template constructor defined
in the class below. EDG eccp issues a warning to point this out, but gcc
silently accepts the code. It would be helpful if gcc were enhanced to
issue a similar diagnostic.
$ cat t.cpp && gcc -dumpversion && gcc -W -Wall -Wextra -pedantic -c t.cpp &&
eccp -c -v t.cpp
struct S { template <class> S () { } };
4.4.1
Edison Design Group C/C++ Front End, version 3.10.1 (Apr 22 2008 17:02:08)
Copyright 1988-2007 Edison Design Group, Inc.
"t.cpp", line 1: warning: template parameter "<unnamed>" is not used in
declaring the parameter types of function template "S::S"
struct S { template <class> S () { } };
^
--
Summary: missing warning for an uncallable function template
Product: gcc
Version: 4.4.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: msebor at gmail dot com
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41423
