cbuild successfully built this on x86_64-precise-cbuild449-oort1-x86_64r1.

The build results are available at:
 http://cbuild.validation.linaro.org/build/gcc-linaro-4.6+bzr106924~yvan-roux~merge-from-fsf-4.6-20130205/logs/x86_64-precise-cbuild449-oort1-x86_64r1

+PASS: gcc.dg/pr56023.c (test for excess errors)
+PASS: gcc.dg/torture/pr55755.c  -O0  execution test
+PASS: gcc.dg/torture/pr55755.c  -O0  (test for excess errors)
+PASS: gcc.dg/torture/pr55755.c  -O1  execution test
+PASS: gcc.dg/torture/pr55755.c  -O1  (test for excess errors)
+PASS: gcc.dg/torture/pr55755.c  -O2  execution test
+PASS: gcc.dg/torture/pr55755.c  -O2 -flto  execution test
+PASS: gcc.dg/torture/pr55755.c  -O2 -flto -flto-partition=none  execution test
+PASS: gcc.dg/torture/pr55755.c  -O2 -flto -flto-partition=none  (test for excess errors)
+PASS: gcc.dg/torture/pr55755.c  -O2 -flto  (test for excess errors)
+PASS: gcc.dg/torture/pr55755.c  -O2  (test for excess errors)
+PASS: gcc.dg/torture/pr55755.c  -O3 -fomit-frame-pointer  execution test
+PASS: gcc.dg/torture/pr55755.c  -O3 -fomit-frame-pointer -funroll-all-loops -finline-functions  execution test
+PASS: gcc.dg/torture/pr55755.c  -O3 -fomit-frame-pointer -funroll-all-loops -finline-functions  (test for excess errors)
+PASS: gcc.dg/torture/pr55755.c  -O3 -fomit-frame-pointer -funroll-loops  execution test
+PASS: gcc.dg/torture/pr55755.c  -O3 -fomit-frame-pointer -funroll-loops  (test for excess errors)
+PASS: gcc.dg/torture/pr55755.c  -O3 -fomit-frame-pointer  (test for excess errors)
+PASS: gcc.dg/torture/pr55755.c  -O3 -g  execution test
+PASS: gcc.dg/torture/pr55755.c  -O3 -g  (test for excess errors)
+PASS: gcc.dg/torture/pr55755.c  -Os  execution test
+PASS: gcc.dg/torture/pr55755.c  -Os  (test for excess errors)
-PASS: gcc.dg/tree-ssa/pr45144.c scan-tree-dump optimized " = VIEW_CONVERT_EXPR<unsigned int>\(a\);"
+PASS: gcc.dg/tree-ssa/pr45144.c scan-tree-dump-not optimized "unnamed-unsigned:19"
+PASS: gcc.dg/tree-ssa/sra-13.c execution test
+PASS: gcc.dg/tree-ssa/sra-13.c (test for excess errors)
+PASS: gfortran.dg/block_12.f90  -O   (test for errors, line 5)
+PASS: gfortran.dg/block_12.f90  -O  (test for excess errors)
+PASS: gfortran.dg/elemental_scalar_args_2.f90  -O0  execution test
+PASS: gfortran.dg/elemental_scalar_args_2.f90  -O0  (test for excess errors)
+PASS: gfortran.dg/elemental_scalar_args_2.f90  -O1  execution test
+PASS: gfortran.dg/elemental_scalar_args_2.f90  -O1  (test for excess errors)
+PASS: gfortran.dg/elemental_scalar_args_2.f90  -O2  execution test
+PASS: gfortran.dg/elemental_scalar_args_2.f90  -O2  (test for excess errors)
+PASS: gfortran.dg/elemental_scalar_args_2.f90  -O3 -fomit-frame-pointer  execution test
+PASS: gfortran.dg/elemental_scalar_args_2.f90  -O3 -fomit-frame-pointer -funroll-all-loops -finline-functions  execution test
+PASS: gfortran.dg/elemental_scalar_args_2.f90  -O3 -fomit-frame-pointer -funroll-all-loops -finline-functions  (test for excess errors)
+PASS: gfortran.dg/elemental_scalar_args_2.f90  -O3 -fomit-frame-pointer -funroll-loops  execution test
+PASS: gfortran.dg/elemental_scalar_args_2.f90  -O3 -fomit-frame-pointer -funroll-loops  (test for excess errors)
+PASS: gfortran.dg/elemental_scalar_args_2.f90  -O3 -fomit-frame-pointer  (test for excess errors)
+PASS: gfortran.dg/elemental_scalar_args_2.f90  -O3 -g  execution test
+PASS: gfortran.dg/elemental_scalar_args_2.f90  -O3 -g  (test for excess errors)
+PASS: gfortran.dg/elemental_scalar_args_2.f90  -Os  execution test
+PASS: gfortran.dg/elemental_scalar_args_2.f90  -Os  (test for excess errors)
+PASS: gfortran.dg/internal_pack_13.f90  -O0  execution test
+PASS: gfortran.dg/internal_pack_13.f90  -O0  (test for excess errors)
+PASS: gfortran.dg/internal_pack_13.f90  -O1  execution test
+PASS: gfortran.dg/internal_pack_13.f90  -O1  (test for excess errors)
+PASS: gfortran.dg/internal_pack_13.f90  -O2  execution test
+PASS: gfortran.dg/internal_pack_13.f90  -O2  (test for excess errors)
+PASS: gfortran.dg/internal_pack_13.f90  -O3 -fomit-frame-pointer  execution test
...and 68 more

The full diff is at:
 http://cbuild.validation.linaro.org/build/gcc-linaro-4.6+bzr106924~yvan-roux~merge-from-fsf-4.6-20130205/logs/x86_64-precise-cbuild449-oort1-x86_64r1/testsuite-diff.txt

The full testsuite results are at:
 http://cbuild.validation.linaro.org/build/gcc-linaro-4.6+bzr106924~yvan-roux~merge-from-fsf-4.6-20130205/logs/x86_64-precise-cbuild449-oort1-x86_64r1/gcc-testsuite.txt

cbuild-checked: x86_64-precise-cbuild449-oort1-x86_64r1