c++/7303: Internal error #75 -- typedef + templates + typeof

c++/7303: Internal error #75 -- typedef + templates + typeof

[een]

>Number:         7303
>Category:       c++
>Synopsis:       Internal error #75 -- typedef + templates + typeof
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Jul 14 01:46:01 PDT 2002
>Closed-Date:
>Last-Modified:
>Originator:     Niklas Een
>Release:        gcc version 2.96 20000731
>Organization:
>Environment:

>Description:
Doing meta programming without __if_exists (as in VC, when
are you going to add it?) takes clever tricks. The only
solution I could come up with results in internal compiler
error :-(. Here is a minimal program that causes the bug:

struct A { int x; };

template <class T> struct B {
    typedef typeof(T().x)   y;
};

int main(void) {
    B<A>    dummy;
    return 0;
}
>How-To-Repeat:
Just compile the above lines.
>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted:
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Re: c++/7303: Internal error #75 -- typedef + templates + typeof

[aj]

Synopsis: Internal error #75 -- typedef + templates + typeof

State-Changed-From-To: open->closed
State-Changed-By: aj
State-Changed-When: Sun Jul 14 02:21:20 2002
State-Changed-Why:
    This is fixed in both GCC 3.1 and 3.2:
    gromit:~/tmp:[0]$ /opt/gcc/3.1-devel/bin/g++ t.C -Wall -O1
    t.C: In function `int main()':
    t.C:8: warning: unused variable `B<A> dummy'

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=7303