[Bug c++/43024] New: ICE on template code with -O2 or -O3, regression from 4.4.2

[orzel at freehackers dot org]

Upgrading from 4.4.2 to 4.4.3, gcc now segfaults when compiling my file. I've
narrowed both the command line and the cpp file (30 lines, visible at the end
of the *.ii attached). Most of the included code is from eigen
(http://eigen.tuxfamily.org/) and is publicly visible on 
http://bitbucket.org/eigen/eigen

When compiled with -O2 or -O3 the segfaults is triggered, without -O option,
the file compiles fine.

The complete line i use is:
g++ -c -O3 -I../../eigen2-tip -o ice.o ice.cpp -save-temps

The output is:
----------------------------------------------------------------------------
In file included from ../../eigen2-tip/Eigen/Core:178,
                 from
../../eigen2-tip/unsupported/Eigen/NonLinearOptimization:29,
                 from ice.cpp:3:
../../eigen2-tip/Eigen/src/Core/DenseStorageBase.h: In member function
‘Eigen::LevenbergMarquardtSpace::Status Eigen::LevenbergMarquardt<FunctorType,
Scalar>::minimizeOneStep(Eigen::Matrix<Scalar, 33331, 1, 0, 33331, 1>&, int)
[with FunctorType = myFunctor, Scalar = double]Â’:            
../../eigen2-tip/Eigen/src/Core/DenseStorageBase.h:516: internal compiler
error: Segmentation fault
Please submit a full bug report, with preprocessed source if appropriate.
See <http://bugs.gentoo.org/> for instructions.  
----------------------------------------------------------------------------

The output of gcc -v is (i'm using gentoo) :
----------------------------------------------------------------------------
Using built-in specs.
Target: x86_64-pc-linux-gnu
Configured with:
/usr/data/tmp/portage/sys-devel/gcc-4.4.3/work/gcc-4.4.3/configure
--prefix=/usr --bindir=/usr/x86_64-pc-linux-gnu/gcc-bin/4.4.3
--includedir=/usr/lib/gcc/x86_64-pc-linux-gnu/4.4.3/include
--datadir=/usr/share/gcc-data/x86_64-pc-linux-gnu/4.4.3
--mandir=/usr/share/gcc-data/x86_64-pc-linux-gnu/4.4.3/man
--infodir=/usr/share/gcc-data/x86_64-pc-linux-gnu/4.4.3/info
--with-gxx-include-dir=/usr/lib/gcc/x86_64-pc-linux-gnu/4.4.3/include/g++-v4
--host=x86_64-pc-linux-gnu --build=x86_64-pc-linux-gnu --disable-altivec
--disable-fixed-point --without-ppl --without-cloog --enable-nls
--without-included-gettext --with-system-zlib --disable-checking
--disable-werror --enable-secureplt --enable-multilib --enable-libmudflap
--disable-libssp --enable-libgomp --enable-cld
--with-python-dir=/share/gcc-data/x86_64-pc-linux-gnu/4.4.3/python
--disable-libgcj --enable-languages=c,c++ --enable-shared
--enable-threads=posix --enable-__cxa_atexit --enable-clocale=gnu
--with-bugurl=http://bugs.gentoo.org/ --with-pkgversion='Gentoo 4.4.3 p1.0'
Thread model: posix
gcc version 4.4.3 (Gentoo 4.4.3 p1.0)
----------------------------------------------------------------------------


-- 
           Summary: ICE on template code with -O2 or -O3, regression from
                    4.4.2
           Product: gcc
           Version: 4.4.3
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: orzel at freehackers dot org
  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=43024