[TUHS] # as first character of file

[TUHS] # as first character of file

[ron minnich]

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

People occasionally forgot this, and hilarity ensued.

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

ron
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[TUHS] # as first character of file

[Clem Cole]

IIRC the V7 compiler did not require it.   It's possible Typesetter C may
have also.


On Wed, Jan 4, 2017 at 11:41 AM, ron minnich <rminnich at gmail.com> 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
>
> People occasionally forgot this, and hilarity ensued.
>
> Now I'm curious. Anyone know when that convention ended?
>
> ron
>
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[TUHS] # as first character of file

[Sven Mascheck]

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
    #