[Pw_forum] more patches

[Ari P Seitsonen]

Dear David [affiliation?], Paolo et alia,

   Just an innocent question: How many compilers do _not_ have an internal 
pre-processor these days or are not able to use an external one? I was 
compiling .F90 files some 10-15 years ago with automatic pre-processing, 
without the need of intermediate files, is it true that the compilers 
would not have adapted a default pre-processor up to now? Well, probably 
there are some compilers still around which might not have this built in, 
would it be possible to treat them as "special cases" and create these 
intermediate files for them as needed?

     Greetings,

        apsi

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   Ari Paavo Seitsonen / Ari.P.Seitsonen at iki.fi / http://www.iki.fi/~apsi/
     Ecole Normale Supérieure (ENS), Département de Chimie, Paris
     Mobile (F) : +33 789 37 24 25    (CH) : +41 79 71 90 935


On Sun, 24 Apr 2016, David Strubbe wrote:

> Hi Paolo,
> My point about cpp is: Octopus (and some other codes) have been using this approach for many years on a variety of platforms. So, I don't see any reason it would cause trouble
> for any compilers. The issue for OSX I mention is related to the filesystem and is independent of the compiler.
> 
> David
> 
> On Fri, Apr 22, 2016 at 4:42 PM, Paolo Giannozzi <p.giannozzi at gmail.com> wrote:
>       First two corrections done, thank you.
>
>             I recommend changing the name of your output from cpp runs to something other than .F90, since on a case-insensitive filesystem (default for Mac OSX)
>             this is the same as the .f90 input file, which makes the compilation fail. For example, in the Octopus project we use _oct.f90.
> 
> 
> For this, we should figure out first if such change is harmless for all other compilers
> 
> Paolo
> 
> --
> Paolo Giannozzi, Dip. Scienze Matematiche Informatiche e Fisiche,
> Univ. Udine, via delle Scienze 208, 33100 Udine, Italy
> Phone +39-0432-558216, fax +39-0432-558222
> 
> 
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