Preprocessor concatenation

[Alberto Luaces]

Steve Kargl writes:

> On Mon, Feb 08, 2016 at 11:52:31PM +0100, Alberto Luaces wrote:
>> 
>> is there any way of writing a concatenation macro when using the
>> preprocessor?  It only works with the "traditional" style
>> 
>> #define paste(x,y) x/**/y
>> 
>> but I wanted it to work with ## in order to be compatible with other
>> compilers.
>> 
>
> From the gfortran documentation: "In the case of GNU Fortran, this isr
> the GNU C Preprocessor in the traditional mode."
>

Yes, that is what I also read from the documentation...

>
> So, the answer to your question is
>
> #ifdef __GFORTRAN__
> #define paste(x,y) x/**/y
> #else
> #define paste(x,y) x ## y
> #endif

...but I did not realize that the solution could be so simple; I was
over-thinking it, and fearing that I would have to write some tests on
my build system.

Thank you, Steve.

-- 
Alberto