[Bug middle-end/63427] New: hwint.h:250:29: runtime error: shift exponent 64 is too large for 64-bit type 'long int'

[trippels at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63427

            Bug ID: 63427
           Summary: hwint.h:250:29: runtime error: shift exponent 64 is
                    too large for 64-bit type 'long int'
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
          Assignee: unassigned at gcc dot gnu.org
          Reporter: trippels at gcc dot gnu.org
                CC: zadeck at gcc dot gnu.org
            Blocks: 63426

gcc build with "-fsanitize=undefined" hits the following issue 
when compiling testsuite/gfortran.dg/integer_exponentiation_5.F90:

markus@x4 gfortran %
/var/tmp/gcc_build_dir_/gcc/testsuite/gfortran/../../gfortran
-B/var/tmp/gcc_build_dir_/gcc/testsuite/gfortran/../../
-B/var/tmp/gcc_build_dir_/x86_64-unknown-linux-gnu/./libgfortran/
/var/tmp/gcc/gcc/testsuite/gfortran.dg/integer_exponentiation_5.F90 
-fno-diagnostics-show-caret -fdiagnostics-color=never    -O0  -fno-range-check 
-B/var/tmp/gcc_build_dir_/x86_64-unknown-linux-gnu/./libgfortran/.libs
-L/var/tmp/gcc_build_dir_/x86_64-unknown-linux-gnu/./libgfortran/.libs
-L/var/tmp/gcc_build_dir_/x86_64-unknown-linux-gnu/./libgfortran/.libs
-B/var/tmp/gcc_build_dir_/x86_64-unknown-linux-gnu/./libquadmath/.libs
-L/var/tmp/gcc_build_dir_/x86_64-unknown-linux-gnu/./libquadmath/.libs
-L/var/tmp/gcc_build_dir_/x86_64-unknown-linux-gnu/./libquadmath/.libs  -lm   
-o ./integer_exponentiation_5.exe                                               
../../gcc/gcc/hwint.h:250:19: runtime error: shift exponent 64 is too large for
64-bit type 'long int'
../../gcc/gcc/hwint.h:250:29: runtime error: shift exponent 64 is too large for
64-bit type 'long int'