[Bug c++/31277] New: incorrect c++ code produces g++ internal error

["ineiev at yahoo dot co dot uk" <gcc-bugzilla at gcc dot gnu dot org>]

The code is

template<class a>class b{friend b<a>a::c();};
template<class a>b<a>a::c(){return b<a>();}

The preprocessed code is

# 1 "stupid.cc"
# 1 "<built-in>"
# 1 "<command line>"
# 1 "stupid.cc"
template<class a>class b{friend b<a>a::c();};
template<class a>b<a>a::c(){return b<a>();}

gcc was built on Fedora Core 4; configured with command:

../gcc-4.1.2/configure --prefix=$HOME/gcc412 --enable-languages=c,c++

the command line producing error is

g++ -v --save-temp -Wall -c stupid.cc 2> err

the error message is:

Using built-in specs.
Target: i686-pc-linux-gnu
Configured with: ../gcc-4.1.2/configure --prefix=/home/dti/gcc412
--enable-languages=c,c++
Thread model: posix
gcc version 4.1.2
 /home/dti/gcc412/libexec/gcc/i686-pc-linux-gnu/4.1.2/cc1plus -E -quiet -v
-D_GNU_SOURCE stupid.cc -mtune=pentiumpro -Wall -fpch-preprocess -o stupid.ii
ignoring nonexistent directory
"/home/dti/gcc412/lib/gcc/i686-pc-linux-gnu/4.1.2/../../../../i686-pc-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
 /home/dti/gcc412/lib/gcc/i686-pc-linux-gnu/4.1.2/../../../../include/c++/4.1.2

/home/dti/gcc412/lib/gcc/i686-pc-linux-gnu/4.1.2/../../../../include/c++/4.1.2/i686-pc-linux-gnu

/home/dti/gcc412/lib/gcc/i686-pc-linux-gnu/4.1.2/../../../../include/c++/4.1.2/backward
 /usr/local/include
 /home/dti/gcc412/include
 /home/dti/gcc412/lib/gcc/i686-pc-linux-gnu/4.1.2/include
 /usr/include
End of search list.
 /home/dti/gcc412/libexec/gcc/i686-pc-linux-gnu/4.1.2/cc1plus -fpreprocessed
stupid.ii -quiet -dumpbase stupid.cc -mtune=pentiumpro -auxbase stupid -Wall
-version -o stupid.s
GNU C++ version 4.1.2 (i686-pc-linux-gnu)
        compiled by GNU C version 4.0.0 20050519 (Red Hat 4.0.0-8).
GGC heuristics: --param ggc-min-expand=64 --param ggc-min-heapsize=64266
Compiler executable checksum: bf947049f66570c1ab11b37642201042
stupid.cc:2: internal compiler error: in is_ancestor, at cp/name-lookup.c:2236
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://gcc.gnu.org/bugs.html> for instructions.


g++ 4.0.4 made similarly produces Segmentation fault:

Using built-in specs.
Target: i686-pc-linux-gnu
Configured with: ../gcc-4.0.4/configure --prefix=/home/dti/gcc404
--enable-languages=c,c++
Thread model: posix
gcc version 4.0.4
 /home/dti/gcc404/libexec/gcc/i686-pc-linux-gnu/4.0.4/cc1plus -quiet -v
-D_GNU_SOURCE stupid.cc -quiet -dumpbase stupid.cc -mtune=pentiumpro -auxbase
stupid -Wall -version -o /tmp/cc85lGkB.s
ignoring nonexistent directory
"/home/dti/gcc404/lib/gcc/i686-pc-linux-gnu/4.0.4/../../../../i686-pc-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
 /home/dti/gcc404/lib/gcc/i686-pc-linux-gnu/4.0.4/../../../../include/c++/4.0.4

/home/dti/gcc404/lib/gcc/i686-pc-linux-gnu/4.0.4/../../../../include/c++/4.0.4/i686-pc-linux-gnu

/home/dti/gcc404/lib/gcc/i686-pc-linux-gnu/4.0.4/../../../../include/c++/4.0.4/backward
 /usr/local/include
 /home/dti/gcc404/include
 /home/dti/gcc404/lib/gcc/i686-pc-linux-gnu/4.0.4/include
 /usr/include
End of search list.
GNU C++ version 4.0.4 (i686-pc-linux-gnu)
        compiled by GNU C version 4.0.0 20050519 (Red Hat 4.0.0-8).
GGC heuristics: --param ggc-min-expand=64 --param ggc-min-heapsize=64266
stupid.cc:2: internal compiler error: Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://gcc.gnu.org/bugs.html> for instructions.

g++ 3.4.6 works fine (complains about the stupid.cc with no internal error)


-- 
           Summary: incorrect c++ code produces g++ internal error
           Product: gcc
           Version: 4.1.2
            Status: UNCONFIRMED
          Severity: minor
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: ineiev at yahoo dot co dot uk
 GCC build triplet: i686-pc-linux-gnu
  GCC host triplet: i686-pc-linux-gnu
GCC target triplet: i686-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31277