Xref: utzoo comp.sources.wanted:2800 comp.lang.c:5713
Path: utzoo!mnetor!uunet!husc6!hao!gatech!mcnc!rutgers!mtune!mtgzz!mtuxo!homxb!hropus!jgy
From: jgy@hropus.UUCP (John Young)
Newsgroups: comp.sources.wanted,comp.lang.c
Subject: Re: Desperately Seeking Makefile Maker
Message-ID: <1456@hropus.UUCP>
Date: 19 Dec 87 03:22:06 GMT
References: <1034@cpocd2.UUCP> <538@silver.bacs.indiana.edu>
Organization: Bell Labs, Holmdel, NJ
Lines: 43

> In article <1034@cpocd2.UUCP> nate@cpocd2.UUCP (Nathan Hess) writes:
> >	Is there a program available that creates makefiles, preferrably
> >	written in C?
> 
>    I thought this may be of general interest to the group, so I'm posting
> it here.
>    This problem sounds like something that could be easily done using the
> standard Unix utilities. If your only file dependencies come from #include
> lines in the files, then this should work pretty well. Use fgrep to
> find all the #include's, and pipe it to awk for prettying up.
> You could say something like this:
> fgrep #include *.c *.h | awk -f makefile.awk >makefile
> 
> and makefile.awk might look something like this:
> BEGIN { ORS = " "; filename = 0 }
> { if ($1 != filename) { filename = $1; print "\n" filename,":",$3 }
>   else print " " $3 }
> END { print "\n" }
> 
> 
	.......
> 
> -	-	-	-	-	-	-	-	-
> Steve Creps on the VAX 8650 running Ultrix 2.0-1 at Indiana University.
> 	creps@silver.bacs.indiana.edu
> "F-14 Tomcat! There IS no substitute."
> 

The major issue here (for C programs) is #include files of course;
As pointed out they may be nested and they also may have dependencies
of the #ifdef, and -I (or #if) nature .  Therefore the way to
reliably determine include files is in the environment that
the compilation is desired. Therefore:

	cc -Dwhatever -Dotherstuff -Iwhatever/path -E filename.c |
		sed -n -e 's/^# 1 .*"\(.*\)"/\1/p' | sort -u

Is what you need to find the #include files necessary for a particular
style of compilation.  If you have a fairly recent version of a AT&T
C compiler you can use the -H flag instead of the -E to just get
desired info.

john young