Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!uflorida!haven!adm!smoke!ibd!heilpern
From: heilpern@ibd.BRL.MIL (Mark A. Heilpern )
Newsgroups: comp.unix.questions
Subject: Re: source versions for multiple machines
Message-ID: <261@ibd.BRL.MIL>
Date: 5 May 89 17:14:05 GMT
References: <8367@chinet.chi.il.us>
Reply-To: heilpern@brl.arpa (Mark A. Heilpern (IBD) <heilpern>)
Organization: Ballistic Research Lab (BRL), APG, MD.
Lines: 29



Maintaining one source code for several machines is not very difficult
at all (if you know what differences you'll have to compensate for.)
All you need do is have sections of code within '#ifdef' and '#ifndef'
sections, and compile with the proper machine name '#define'd.
Ex:

--------
#define machineA

main()
{
#ifdef machineA
	printf("machine A\n");
#endif

#ifdef machineB
	printf("machine B\n");
#endif
}
--------
Just change the #define line from on computer to another. Or, an easier
way is to neglect the #define, and place the define in your compile
command, as follows for the above example.
$ cc -o file file.c -DmachineA

have fun...
	--M.