Conditional Compilation

[Steve Emsley]

Hi,

I've been trying to set up my probe display so that I can set a
preprocessor flag to determine whether or not a display will be
created. So I do the following:

#ifdef LIGHT
 ... code to create display
#endif

when I run the command:

cpp -DLIGHT infile outfile

it works fine. However, I cannot figure out what I need to put into
the Makefile. If I create:

CPPFLAGS=-DLIGHT

and add $(CPPFLAGS) to the CFLAGS line the only time I see the -DLIGHT
in the expanded command list to the compiler is when a .c file I use
is compiled. The -DLIGHT does not seem to be included when any of the
.m files are compiled...where it is required

Can someone point me to the right directive!
Cheers,
Steve.
-- 
---------------------------------------------------------------------
 Steve Emsley                 Ecosystems Analysis & Management Group
 address@hidden              University of Warwick, England
 http://www.oikos.warwick.ac.uk/~sme/           (+44) (0)1598 753648
---------------------------------------------------------------------

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