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Re: K&R function definition with typedef parameter names

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Steve Keller <keller@no.invalid> writes:

> I wonder if the old K&R style function definition allowed to use
> function parameter names that were already typedef'd.  Current
> compilers like gcc, clang, and tcc don't allow this:
>
>     typedef int t;
>     int fun(t)
>         int t;
>     {
>         return 0;
>     }
>
> The compilers I tested on this seem to interpret "int fun(t)" as a
> function declaration of fun that takes one argument of type t.  I
> don't have any pre C90 compiler available but would like to know how
> this would be handled.  If the above was possible in old pre-ANSI C
> this seems to have changed.  Was it intentionally and is it stated
> explicitely anywhere?

I think you've already gotten an answer to the second part of
your question.

On the first part -- without having any data to offer, what I
suspect is true is that some pre-standard compilers did one
thing and other pre-standard compilers did something else.  In
other words the field was not homogeneous, and the decision was
not to make a "change" but to decide what should be done for
standardized C.

The Rationale document is pretty good about calling out changes
in standard C relative to what was done in pre-standard C.  The
Rationale says nothing about the standard C rule being a change
over earlier C compilers.  That isn't absolutely compelling
evidence, but it is some evidence that pre-standard compilers
didn't all behave the same way for this scenario.

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Thread

K&R function definition with typedef parameter names Steve Keller <keller@no.invalid> - 2020-01-04 19:31 -0800
  Re: K&R function definition with typedef parameter names Ben Bacarisse <ben.usenet@bsb.me.uk> - 2020-01-05 04:00 +0000
    Re: K&R function definition with typedef parameter names Steve Keller <keller@no.invalid> - 2020-01-09 06:26 -0800
  Re: K&R function definition with typedef parameter names James Kuyper <jameskuyper@alumni.caltech.edu> - 2020-01-04 23:15 -0500
    Re: K&R function definition with typedef parameter names Steve Keller <keller@no.invalid> - 2020-01-09 06:27 -0800
  Re: K&R function definition with typedef parameter names Bonita Montero <Bonita.Montero@gmail.com> - 2020-01-05 06:47 +0100
    Re: K&R function definition with typedef parameter names Steve Keller <keller@no.invalid> - 2020-01-09 06:25 -0800
      Re: K&R function definition with typedef parameter names Bonita Montero <Bonita.Montero@gmail.com> - 2020-01-09 16:22 +0100
        Re: K&R function definition with typedef parameter names James Kuyper <jameskuyper@alumni.caltech.edu> - 2020-01-09 08:20 -0800
          Re: K&R function definition with typedef parameter names Thiago Adams <thiago.adams@gmail.com> - 2020-01-09 10:49 -0800
            Re: K&R function definition with typedef parameter names David Brown <david.brown@hesbynett.no> - 2020-01-10 10:22 +0100
              Re: K&R function definition with typedef parameter names Ben Bacarisse <ben.usenet@bsb.me.uk> - 2020-01-10 13:05 +0000
                Re: K&R function definition with typedef parameter names David Brown <david.brown@hesbynett.no> - 2020-01-10 16:14 +0100
                Re: K&R function definition with typedef parameter names Richard Damon <Richard@Damon-Family.org> - 2020-01-10 11:15 -0500
                Re: K&R function definition with typedef parameter names James Kuyper <jameskuyper@alumni.caltech.edu> - 2020-01-10 20:51 -0500
              Re: K&R function definition with typedef parameter names Thiago Adams <thiago.adams@gmail.com> - 2020-01-10 06:24 -0800
                Re: K&R function definition with typedef parameter names David Brown <david.brown@hesbynett.no> - 2020-01-10 16:26 +0100
          Re: K&R function definition with typedef parameter names Nick Bowler <nbowler@draconx.ca> - 2020-01-13 22:12 +0000
  Re: K&R function definition with typedef parameter names Autist <autist69@gmail.com> - 2020-01-10 16:42 +0100
  Re: K&R function definition with typedef parameter names Tim Rentsch <tr.17687@z991.linuxsc.com> - 2020-01-11 09:56 -0800

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