From:	"Patrick Chen" <pck66 AT pd DOT jaring DOT my>
Newsgroups:	comp.os.msdos.djgpp
Subject:	conditional compilation for typedef
Date:	Sun, 28 Jul 2002 14:57:38 +0800
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To:	djgpp AT delorie DOT com
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Reply-To:	djgpp AT delorie DOT com

Use Rhide: C, djgpp.
Dear All,
    The files are as follows:
mouse3.c - main file
lmouse3_video.c - implementation file-video functions
lmouse3_video.h- header file -video functions
lmouse3_bitmap.c - implementation file- bitmap functions
lmouse3_bitmap.h - header file - bitmap functions

lmouse3_video.h contains:
typedef unsigned short word;

lmouse3_bitmap.h contains:
typedef unsigned short word;

Compilation-Build all, incurred multiple definition error.
Removing a copy from one of the header files above can solve the problem.
But it cause inconvenience of having to remove typedef everytime whenever a
new library is added to the main program compilation list. And it may cause
'no typedef' when another main program try to use the lib associated with
the h file, in which the typedef was removed by an earlier program.
   Is there a condition compilation statement that can be put to every
header file, so that whenever the first one is found by the pre-processor
the other one will be ignored?
   If not, please suggest a better style to declare typedef for developing
program using multiple libraries.

Thanks.

Patrick

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