cernlib, preprocessor, etc

From: Djamel Ouerdane (ouerdane@nbi.dk)
Date: Mon Mar 05 2001 - 05:56:14 EST

  • Next message: Djamel Ouerdane: "update in gbrahms" 

    Hi brahms developers,

I've noticed some problems when I tried to compile gbrahms on my machine
(Red Hat linux 7.0)

The cernlib (2001) has slightly changed (cf README file enclosed with the
library). I had to add in geant.mk the following line:

 -L$(LIB) -llapack3 -lblas

with the usual stuff

The other thing concerns the preprocessor. Some files (*.F) need to be
preprocessed before being compiled. The rule to preprocess the *.F files
is:

gcc -E -C -P -x c $(CPPFLAGS) $(D_SYMBOLS) -o $*.f $<

Among options of the preprocessor (gcc), there is -x c
which means that it treats the input file like a c file (as far as I
know). My version of gcc is 2.96 (according to Christian, this version is
known to be buggy), this is the one that you get with redhat 7.
One of the bad consequence of this is to reduce the space between
numerical labels and statements (in the source file) to one space. More
precisely, suppose that in your *.F file, you have this piece of code:

   ...
   ...
   ...
c234567 , comment for column index

      if (something) goto 10
   ...
   ...
   ...

10    return
      end


This kind of thing is fine. But when you preprocess this code with the
option -x c, you will get in the output (*.f) file:

      if (something) goto 10
   ...
   ...
   ...

10 return
      end


when you want then to compile this file, it will obviously fail.
The trick I used was to shift the label to the right in the *.F file
so that you get (*.f file):


      if (something) goto 10
   ...
   ...
   ...

   10 return
      end



My question is then: do we really need the option -x c for the
preprocessing ? So far there wasn't any problem but with redhat 7, that's
not the case.

I'm not an expert of this kind of thing so I wish some of
you know better than me :)

Thanks

Ciao
Djamel


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