Mark Klein ([log in to unmask]) wrote:
: Rakesh Saha posts:
 
: >I am passing a #define value in Makefile which is a long.
: >The cpp seems to truncate the value passed. Here is what happened: I
: >have -DTIME=841839547L in my Makefile. When I compile the value of TIME
: >is shown as 841839, i.e I get TIME=841839.
 
: >Can someone solve this mystery ?
 
: Sure, use gcc!
 
: Actually the problem is with the length of the command line buffer in
: cpp. It is fairly limited. I don't recall the actual limit, but ran into
: it myself when porting gcc. Further, I suspect that the compiler front
: end is defining and including various standard definitions (e.g.
: -D__hp3000s900__ -DMPEXL_SOURCE, etc) as well. This further reduces the
: amount of space you have for your own defines.
 
The command line limitation was somewhere between 255 and 279
characters.  It is being addressed (SR #D500-261875); if this
turns out to be your problem, there may already be a new
version of the compiler and cpp available that has a larger
command line buffer.  Note that setting the CCOPTS environment
variable does NOT work around this problem, as the compiler
simply reads the variable and appends it to the INFO= string
it passes to the preprocessor.  You can work around it,
however, by putting the #defines in your source file.
 
Or, as Mark suggests, you can use gcc instead, which I ended
up doing for other reasons that weren't so easily worked around.
 
Mike
 
-----------------------------------------------------------------
Mike Yawn                            email       [log in to unmask]
Hewlett-Packard                      HPDesk   Mike YAWN/HP6650/21
Commercial Systems Division          Voice         (408) 447-4367
19447 Pruneridge Ave M/S 44UP        Fax           (408) 447-0312
Cupertino, CA  95014
-----------------------------------------------------------------