Methods and Systems for automatically reordering variables as a part of compiling and linking source code. In one embodiment, a compiler identifies a set of variables that are candidates for reordering. The candidate variables are associated with one or more source code files that are being compiled. The compiler collects data used for determining a potential layout of the candidate variables. The linker determines the potential layout based, at least in part, on the data and reorders the candidate variables based, at least in part, on the potential layout.