Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!uunet!mcsun!ukc!acorn!john
From: john@acorn.co.uk (John Bowler)
Newsgroups: comp.windows.x
Subject: Re: Does cc -E read from stdin?
Summary: Need cc -E -
Keywords: Imake
Message-ID: <2625@acorn.co.uk>
Date: 2 Aug 90 13:43:04 GMT
References: <1990Jul31.225117.4362@smsc.sony.com>
Reply-To: john@acorn.UUCP (John Bowler)
Organization: Acorn Computers Ltd, Cambridge, UK
Lines: 15

In article <1990Jul31.225117.4362@smsc.sony.com> dce@smsc.sony.com (David Elliott) writes:
>In X11R4, the util/scripts stuff uses "$(PREPROCESSCMD) < filename" to
>generate scripts.  PREPROCESSCMD defaults to the C compiler (e.g., cc)
>with the -E option.
>
>...
>Is it common for cc to read from stdin, or is this a more general
>flaw in X11R4?

No - the ``standard'', the pcc front end (BSD 4.3), expects ``cc -E -''; ie
it interprets the filename ``-'' as meaning ``read from stdin''.  On the
other hand cpp (ie the preprocessor bit of pcc) acts as a filter and
reads from stdin (but it will also take a file name, including ``-''.

John Bowler (jbowler@acorn.co.uk)