c++/8149: internal error: Segmentation fault

c++/8149: internal error: Segmentation fault

[sneechy]

>Number:         8149
>Category:       c++
>Synopsis:       internal error: Segmentation fault
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          ice-on-illegal-code
>Submitter-Id:   net
>Arrival-Date:   Fri Oct 04 15:16:01 PDT 2002
>Closed-Date:
>Last-Modified:
>Originator:     sneechy@hotmail.com
>Release:        gcc version 3.2 (mingw special 20020817-1)
>Organization:
>Environment:
Windows XP, gcc configure options: --with-gcc --with-gnu-ld --with-gnu-as --host=mingw32 --target=mingw32 --prefix=/mingw --enable-threads --disable-nls --enable-languages=f77,c++,objc,ada --disable-win32-registry --disable-shared
>Description:
The following four lines of code:

#include <typeinfo>
struct B { template <typename U> struct C; };
template <typename T> struct A { typedef typename T::C V; };
void f () { A<B>::V p; }

Result in an internal compiler error:
"internal error: Segmentation fault"
>How-To-Repeat:
Compile the four lines of code (see problem description).
>Fix:
I don't have a clue..
>Release-Note:
>Audit-Trail:
>Unformatted:

Re: c++/8149: internal error: Segmentation fault

[reichelt]

Synopsis: internal error: Segmentation fault

State-Changed-From-To: open->analyzed
State-Changed-By: reichelt
State-Changed-When: Wed Oct 23 13:36:45 2002
State-Changed-Why:
    Confirmed.
    
    The example can be reduced a little bit further:
    
    -------------------------snip here-------------------------
    struct B { template <typename U> struct C; };
    template <typename T> struct A { typedef typename T::C V; };
    A<B>::V p;
    -------------------------snip here-------------------------
    
    Compiling this with "g++ -c" using the 3.2-branch or the main trunk
    results in an ICE (checked on i686-pc-linux-gnu). With gcc 3.0.x or
    2.95.x I get an error message:
    
    PR8149.cc:3: aggregate `B::C<U> p' has incomplete type and cannot be 
       initialized
    PR8149.cc:3: storage size of `p' isn't known
    
    Changing "struct C;" to "struct C{};" in the first line to get rid of this
    message (the rest of the code still remains illegal) causes gcc 3.0.x to
    issue an ICE and 2.95.x to issue an assembler error.

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=8149