From mboxrd@z Thu Jan  1 00:00:00 1970
From: mascheck+tuhs@in-ulm.de (Sven Mascheck)
Date: Thu, 5 Jan 2017 05:24:03 +0100
Subject: [TUHS] # as first character of file
In-Reply-To: <CAP6exYLU-tQwdOpgU4GAuANa4WscoAdHu+rm+SyLRMLB3=VEWw@mail.gmail.com>
References: <CAP6exYLU-tQwdOpgU4GAuANa4WscoAdHu+rm+SyLRMLB3=VEWw@mail.gmail.com>
Message-ID: <20170105042403.GA652972@lisa.in-ulm.de>

On Wed, Jan 04, 2017 at 04:41:06PM +0000, ron minnich wrote:
> I just went looking at the v6 source to confirm a memory, namely that cpp
> was only invoked if a # was the first character in the file. Hence, this:
> https://github.com/dspinellis/unix-history-repo/blob/Research-V6-Snapshot-Development/usr/source/c/c01.c#L1

In v6 cc(1) still does the job itself. Here is where it actually happens, in expand():
https://github.com/dspinellis/unix-history-repo/blob/Research-V6-Snapshot-Development/usr/source/s1/cc.c#L249

> Now I'm curious. Anyone know when that convention ended?

In v7 various files still have # as first character, but the requirement has gone,
https://github.com/dspinellis/unix-history-repo/tree/Research-V7/usr/src/cmd/cpp

    # cat x.h
     /* */
    #define macro value
    macro

    # /lib/cpp x.h
    # 1 "x.h"
    
    value
    #