This happens when compiling povray-3.6.1 with gcc version 4.3.0 20070616
(experimental). The testcase (reduced with delta) is attached to the report.

g++ -O2 xxx.cpp
xxx.cpp: In function ‘double pov::Evaluate_TPat(pov::TPATTERN*, double*,
pov::INTERSECTION*)’:
xxx.cpp:146: internal compiler error: in build_polynomial_chrec, at
tree-chrec.h:113
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://gcc.gnu.org/bugs.html> for instructions.


-- 
           Summary: internal compiler error: in build_polynomial_chrec, at
                    tree-chrec.h:113
           Product: gcc
           Version: 4.3.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: ubizjak at gmail dot com
 GCC build triplet: x86_64-pc-linux-gnu
  GCC host triplet: x86_64-pc-linux-gnu
GCC target triplet: x86_64-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32367