check problems with -g/-m64

[IainS]

make check with  -m64 on
powerpc-apple-darwin8 is throwing our a huge number of extra errors  
when checking gfortran (c.f. default, m32).

The errors arise when -g and -m64 appear together on the command line.

for example (duplicating one command line from the testsuite):

./dst-powerpc/usr/bin/gfortran-4.4.0 -g -m64 -pedantic-errors ../ 
gcc-44-trunk/gcc/testsuite/gfortran.dg/actual_array_result_1.f90

fails with "can't find atom for N_GSYM stabs flag:G(0,3) in /var/tmp// 
cciKFHni.o"

./dst-powerpc/usr/bin/gfortran-4.4.0 -g -pedantic-errors ../gcc-44- 
trunk/gcc/testsuite/gfortran.dg/actual_array_result_1.f90

<no error>

./dst-powerpc/usr/bin/gfortran-4.4.0 -m64 -pedantic-errors ../gcc-44- 
trunk/gcc/testsuite/gfortran.dg/actual_array_result_1.f90

< no error>

any idea what's going on here?
Iain