Compiling Old Version Code

[jhk1]

I failed to compile a Fortran code written about 30 years ago using the Intel oneAPI Fortran compiler 2025 integrated with Visual Studio 2022.

I think that the compiling tools are too new to compile my code.

I may need an older version compiler to fit my code.

Please help me figure out a way to compile my code.

I can show my code if there is an appropriate way.

[andrew_4619]

Old Fortran should always compile, that is a strength of Fortran. There can be illegal stuff in your code that an old compiler did not pick up. Show some errors or code.

[jhk1]

The old version code has been uploaded herewith.

Thanks.

[GVautier · Accepted solution]

Nothing obviously odd in this code. Be sure to compile as fixed source form and it should work.

Post compilation errors if any.

[jhk1]

It works.

Your advice is deeply appreciated.

[andrew_4619]

compiles ok, no errors

[GVautier]

With a second look, I found that for some lines there is a  tabulation as first character. They must be converted to 6 blanks

[andrew_4619]

Yes the tabs are non-standard and are best removed  but it compiles...

[GVautier]

There always is a risk that a text editor converts the tabs to 4 blanks and therefore the code will not be able to be compiled.

[jhk1]

Thanks a lot for showing me a professional attitude.