On 08/02/2012 12:35 PM, Rachel Dowdall wrote: --- snip --- > I compiled with gfortran-4.7: > FFLAGS = -static -O3 -pg -ffree-form --- snip --- For what it is worth, -fdump-tree-original with the above flags gives exactly identical output for the .f and .f90 case. The .o files differ in length by 8 bytes. I suspect due to the source file name difference. Jerry