I've committed the following patch to the gfortran manual as gfortran rejects the negative form for -ffixed-form.
Index: ChangeLog =================================================================== --- ChangeLog (revision 222724) +++ ChangeLog (working copy) @@ -1,3 +1,8 @@ +2015-05-02 Steven G. Kargl <ka...@gcc.gnu.org> + + PR fortran/65976 + * invoke.texi: Remove 'no-' in '-fno-fixed-form' + 2015-05-01 Mikael Morin <mik...@gcc.gnu.org> * simplify.c (simplify_bound_dim): Tighten the check for array fullness Index: invoke.texi =================================================================== --- invoke.texi (revision 222724) +++ invoke.texi (working copy) @@ -119,7 +119,7 @@ by type. Explanations are in the follow -fdefault-real-8 -fdollar-ok -ffixed-line-length-@var{n} @gol -ffixed-line-length-none -ffree-form -ffree-line-length-@var{n} @gol -ffree-line-length-none -fimplicit-none -finteger-4-integer-8 @gol --fmax-identifier-length -fmodule-private -fno-fixed-form -fno-range-check @gol +-fmax-identifier-length -fmodule-private -ffixed-form -fno-range-check @gol -fopenacc -fopenmp -freal-4-real-10 -freal-4-real-16 -freal-4-real-8 @gol -freal-8-real-10 -freal-8-real-16 -freal-8-real-4 -std=@var{std} } @@ -199,7 +199,7 @@ accepted by the compiler: @item -ffree-form @itemx -ffixed-form @opindex @code{ffree-form} -@opindex @code{fno-fixed-form} +@opindex @code{ffixed-form} @cindex options, Fortran dialect @cindex file format, free @cindex file format, fixed -- Steve