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"You take a million, billion tonnes of flaming inferno and turn it into 'twinkle, twinkle little star' ..."

Thu, 24 May 2007

Preprocessor abuse : chapter 2 of lots.

Those who program C are used to seeing function / subroutine definitions in header files. Not so in Fortran, there people use the C pre-processor to put Header files in subroutine definitions.

Don't try this at home, folks.

Again, names changed to protect the afflicted ... 

subroutine  funmame( param1,
	      param2, param3,
#ifdef FOO32
	     foo, bar,
#endif
	      param7, param8, 
#include "basarg.h"
	     )

Remarkably, basarg.h included: 

	C Comment.
	param5, param6,
#ifdef SOMETHING
        param10, param20,
#endif

There were in fact dozens of parameters in basarg.h.. And even a higher.h that included basarg.h but had more parameters ...

Well, Fortran and the C prepro... never got so far during my short career as a Fortran programmer :)
Some years ago though, when I was obliged to maintain a Linux setup for a cluster and its different headnodes using Kickstart (yes, RedHat 7.2), I did something similar: create all the individual files from a master file using -Defines and cpp... almost forgotten about that, after 3 years of FAI :-) I'll never go back!!!

Posted by Steffen Grunewald at Thu May 24 16:48:36 2007

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