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

Robert Swierczek rmswierczek at gmail.com
Wed Jan 4 07:53:02 AEST 2017


> 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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