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From: ronald@robobar.co.uk (Ronald S H Khoo)
Newsgroups: comp.unix.programmer
Subject: Re: mkdep program for SysV (Xenix/Unix)
Message-ID: <1990Dec17.171906.8080@robobar.co.uk>
Date: 17 Dec 90 17:19:06 GMT
References: <1990Dec13.010143@cs.yale.edu> <1990Dec14.023842.21164@robobar.co.uk> <1990Dec16.020414.8652@NCoast.ORG>
Organization: Robobar Ltd., Perivale, Middx., ENGLAND.
Lines: 33

allbery@ncoast.ORG (Brandon S. Allbery KB8JRR) writes:
 
> If I remember correctly, BSD cc has -M but it has to be massaged to produce
> dependencies.  gcc has -M and -E -M (I think that's correct); the latter
> produces dependencies in Makefile format.

Maybe gcc's changed since you last looked at its options.  I quote the
relevant portion of "man gcc" (which says 1.36 on it, but is the one
distributed with gcc 1.37.1, ie the current gcc)

> once you trust a tool, you don't worry it to death.)

An excellent point.

Begin excerpt from /usr/man/cat.G/gcc.G:-----------------------------------
	  -M   Tell the	preprocessor to	output a rule suitable for
	       make(1) describing the dependencies of each source
	       file.  For each source file, the	preprocessor outputs
	       one make-rule whose target is the object	file name for
	       that source file	and whose dependencies are all the
	       files #included in it.  This rule may be	a single line
	       or may be continued with	\-newline if it	is long.

	       -M implies -E.

	  -MM  Like -M but the output mentions only the	user-header
	       files included with #include "file".  System header
	       files included with #include <file> are omitted.

	       -MM implies -E.
End   excerpt from /usr/man/cat.G/gcc.G:-----------------------------------
-- 
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