[TUHS] When was #if introduced in C? (was: Re: Mac OS X is Unix)

[Clem Cole]

Great minds think alike..   This lines up with my memory.

On Tue, Jan 3, 2017 at 4:53 PM, Robert Swierczek <rmswierczek at gmail.com>
wrote:

> > Which makes me curious... Does anyone here happen to know when #if was
> introduced in C?
>
> From what I can gather from studying the TUHS archives, the earliest
> cpp that supports #if is in PWB:
> http://minnie.tuhs.org/cgi-bin/utree.pl?file=PWB1/sys/c/c/cpp.c
>
> Before that, the pre-processor resides within the cc.c command and #if
> is not supported:
> http://minnie.tuhs.org/cgi-bin/utree.pl?file=V6/usr/source/s1/cc.c
>
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