[Patch, Fortran] PR34899 - Support <tab><digit> as continuation line marker (fixed form)

[Jerry DeLisle]

Tobias Burnus wrote:
> In standard fixed-form Fortran source code, a "normal" line begins with 
> 6 spaces and a continuation line with 5 spaces plus some character such 
> as '*' (there are some restrictions, see F95/F2003 standard).
> 
> A very common vendor extension is to support <tab> as replacement for 6 
> spaces, which also gfortran supports. However, how to create then a 
> continuation line? Well, for g77, NAG f95, ifort, openf95, sunf95, 
> pathscale, pgf95, Absoft the answer is: <tab><digit> where digit is not 
> zero.
> 
> The attached patch now does the following: It replaces '\t' by 6 spaces 
> (before it was 7) and if the the tab is followed by a non-zero digit, it 
> places it at position 6.
> 
> 
> Build and regression tested on x86-64-linux.
> OK for the trunk?
> 
> Tobias
> 
> 
> PS: The patch was motivated to get to build 
> http://www.chara.gsu.edu/~gudehus/fits_library_package.html. However, 
> due to other problems it still won't build. gfortran stops first for 
> integer_var = .true. (unless -std=legacy) and then for "real_var = ' '". 
> Replacing them by transfer it stops at the same line as ifort.

The patch is OK.  See my rant posted with the PR.  Lets not make gfortran a 
catch all compiler.  The application you are wanting here really needs to be 
fixed and done right.  Neither gfortran or ifort should be expecte to compile crap.

Jerry