compile as f77?

[laura_s_kang]

I have some old fortran codes in f77. When I compile them in Intel Visual Fortran, it's compiled, but results are not quite right. Is there any option in the property I can select to compile filesas f77?

Thanks,

Laura

[TimP]

ifort has a bunch of options to match specific features of past f77 compilers. Most of them don't pertain to differences between f77 and f90. Certain compilers which had the equivalent of -Qsave and -Qzero as defaults. The behavior implicit in /fpconstant was permitted as a default in f77, but not f90. If the program was written for a machine which had a high default precision, /Qautodouble might be appropriate. /fltconsistency requires stricter compliance with the Fortran standard on parentheses, and has other effects besides.

[Steven_L_Intel1]

A correct F77 program should not have any differences, but many programs make assumptions that aren't valid in F90. Tim mentioned the big one which affects code such as:

DOUBLE PRECISION PI
PI = 3.1415926535897

That value is single precision, but many F77 compilers carried it in higher precision for the assignment. F90 doesn't allow that. /fpconstant gets the nonstandard behavior.

There really aren't any SAVE differences worth mentioning.

[madhu_iitc]

I am having a problem running F 77 code on intel 7.1 compiler for windows. I tried running it on microsoft V NET and also on the DOS prompt. even then i am getting lot of errors.

the compile command i used is : ifl -FI filename.

any suggestions will be appreciated,

thank you,

cheers

Madhu

[Steven_L_Intel1]

What are the errors? What is the actual filename?