http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59821
--- Comment #5 from Aldy Hernandez <aldyh at gcc dot gnu.org> --- (In reply to Jason Merrill from comment #3) > I think gimplify_arg clobbering a valid EXPR_LOCATION is wrong; both cases > should give the location of the default argument definition. > > Aldy, what was the rationale for that change (r140917)? Unfortunately this was by design to make multi-line non-trivial arguments play nice with the debugger. Perhaps it's time to revisit the ``is_stmt'' DWARF flag for this? More details here: http://gcc.gnu.org/ml/gcc-patches/2008-10/msg00191.html
