armel ICE gcc-4.4

works with g++-4.4 -O1, -O3, -Os

fails with g++-4.5 -O2, works with -Os -O1

g++ -g -O2 -Wall -pedantic -fno-pic -D_FORTIFY_SOURCE=0 -fno-stack-protector -c perf-main.ii

In file included from /home/doko/tmp/mrpt-0.8.1/include/mrpt/random/RandomGenerators.h:34,
                 from /home/doko/tmp/mrpt-0.8.1/include/mrpt/random.h:33,
                 from /home/doko/tmp/mrpt-0.8.1/include/mrpt/bayes/CRejectionSamplingCapable.h:34,
                 from /home/doko/tmp/mrpt-0.8.1/include/mrpt/bayes.h:38,
                 from /home/doko/tmp/mrpt-0.8.1/include/mrpt/core.h:47,
                 from /home/doko/tmp/mrpt-0.8.1/apps/mrpt-performance/perf-main.cpp:35:
/home/doko/tmp/mrpt-0.8.1/include/mrpt/math/ops_matrices.h: In function 'typename MATRIX::mrpt_autotype::value_type mrpt::math::detail::detMatrix(const MATRIX&) [with MATRIX = mrpt::math::CMatrixFixedNumeric<float, 40u, 40u>]':
/home/doko/tmp/mrpt-0.8.1/include/mrpt/math/ops_matrices.h:956: error: insn does not satisfy its constraints:
(insn 561 91 93 16 /home/doko/tmp/mrpt-0.8.1/include/mrpt/math/CArray.h:116 (set (reg:SI 1 r1)
        (plus:SI (mult:SI (reg:SI 3 r3 [178])
                (const_int 4 [0x4]))
            (reg/f:SI 13 sp))) 690 {*thumb2_arith_shiftsi} (nil))
/home/doko/tmp/mrpt-0.8.1/include/mrpt/math/ops_matrices.h:956: internal compiler error: in reload_cse_simplify_operands, at postreload.c:397
Please submit a full bug report,
with preprocessed source if appropriate.

sorry, g++-4.5 -O1 ices too.

This bug was fixed in the package mrpt - 1:0.8.1-1ubuntu2

---------------
mrpt (1:0.8.1-1ubuntu2) maverick; urgency=low

  * On armel build using -Os instead of -O2 to work around a g++ ICE.
    LP: #635409.
  * Always pass CFLAGS, CXXFLAGS, LDFLAGS to the build.
 -- Matthias Klose <email address hidden> Sun, 19 Sep 2010 13:23:12 +0200

Confirmed in plain gcc-linaro-4.5-2010.09-1

This bug was reported upstreams, and has been fixed in gcc 4.6.
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44787

This bug might be introduced to linaro gcc 4.5 when we backport patches from gcc 4.6. Backport patch to in my local linaro 4.5 tree, and see ICE goes away.

$ ./install/bin/arm-none-linux-gnueabi-g++ -g -O2 -Wall -pedantic -fno-pic -D_FORTIFY_SOURCE=0 -fno-stack-protector -c ../perf-main.ii

Committed to linaro gcc 4.4 branch too.

Linaro gcc releases including this fix incorporated into the natty packages; marking as resolved.