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Re: Cake - C23 to C99 transpiler

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Ben Bacarisse <ben.usenet@bsb.me.uk> writes:

> David Brown <david.brown@hesbynett.no> writes:
>
>> I believe (but I might have this wrong) that the use of dollar signs
>> in identifiers is undefined behaviour according to the standard.
>
> I don't think it's undefined.  Recent C drafts permit "other
> implementation defined characters" in the syntax, so I'm not sure how it
> could be undefined.

If the implementation's documentation lists dollar sign amoung
the set of implementation-defined characters for identifiers,
the behavior is defined.  Otherwise, the presence of dollar
sign (in source that hasn't been filtered out by preprocessor
directives) results in a syntax error, which makes the behavior
undefined.

> The C23 draft permits an XID_Start character followed by XID_Continue
> characters.  These may, in fact, include $ but I got lost down the
> rabbit hole of referenced standards so I can't be sure.

Looking at some Unicode reference material and also looking
at some web search results, the evidence seems pretty strong
that $ and @ are not included in the XID_Start and XID_Continue
default sets.  However, it isn't clear (at least it isn't to
me) whether the C23 draft admits the possibility that $ and @
may be accepted under an implementation-defined umbrella.

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Thread

Cake -  C23 to C99 transpiler Thiago Adams <thiago.adams@gmail.com> - 2022-08-18 18:44 -0700
  Re: Cake - C23 to C99 transpiler Blue-Maned_Hawk <bluemanedhawk@example.invalid> - 2022-09-06 02:48 -0400
    Re: Cake - C23 to C99 transpiler Thiago Adams <thiago.adams@gmail.com> - 2022-09-06 10:08 -0700
      Re: Cake - C23 to C99 transpiler Vir Campestris <vir.campestris@invalid.invalid> - 2022-09-07 12:27 +0100
        Re: Cake - C23 to C99 transpiler Thiago Adams <thiago.adams@gmail.com> - 2022-09-07 05:45 -0700
          Re: Cake - C23 to C99 transpiler Bart <bc@freeuk.com> - 2022-09-07 15:35 +0100
            Re: Cake - C23 to C99 transpiler Ben Bacarisse <ben.usenet@bsb.me.uk> - 2022-09-07 16:38 +0100
              Re: Cake - C23 to C99 transpiler Bart <bc@freeuk.com> - 2022-09-07 17:04 +0100
                Re: Cake - C23 to C99 transpiler Anton Shepelev <anton.txt@g{oogle}mail.com> - 2022-09-07 19:14 +0300
                Re: Cake - C23 to C99 transpiler Ben Bacarisse <ben.usenet@bsb.me.uk> - 2022-09-07 17:31 +0100
                Re: Cake - C23 to C99 transpiler Bart <bc@freeuk.com> - 2022-09-07 17:40 +0100
                Re: Cake - C23 to C99 transpiler Ben Bacarisse <ben.usenet@bsb.me.uk> - 2022-09-07 17:49 +0100
                Re: Cake - C23 to C99 transpiler Bart <bc@freeuk.com> - 2022-09-07 19:27 +0100
                Re: Cake - C23 to C99 transpiler Ben Bacarisse <ben.usenet@bsb.me.uk> - 2022-09-07 20:02 +0100
                Re: Cake - C23 to C99 transpiler Bart <bc@freeuk.com> - 2022-09-07 21:03 +0100
                Re: Cake - C23 to C99 transpiler Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2022-09-07 13:52 -0700
                Re: Cake - C23 to C99 transpiler Tim Rentsch <tr.17687@z991.linuxsc.com> - 2022-09-14 07:14 -0700
                Re: Cake - C23 to C99 transpiler Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2022-09-14 10:59 -0700
                Re: Cake - C23 to C99 transpiler Tim Rentsch <tr.17687@z991.linuxsc.com> - 2022-09-15 23:46 -0700
                Re: Cake - C23 to C99 transpiler David Brown <david.brown@hesbynett.no> - 2022-09-07 20:17 +0200
                Re: Cake - C23 to C99 transpiler Ben Bacarisse <ben.usenet@bsb.me.uk> - 2022-09-07 19:58 +0100
                Re: Cake - C23 to C99 transpiler Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2022-09-07 13:26 -0700
                Re: Cake - C23 to C99 transpiler Ben Bacarisse <ben.usenet@bsb.me.uk> - 2022-09-07 23:42 +0100
                Re: Cake - C23 to C99 transpiler Tim Rentsch <tr.17687@z991.linuxsc.com> - 2022-09-14 06:45 -0700
                Re: Cake - C23 to C99 transpiler Tim Rentsch <tr.17687@z991.linuxsc.com> - 2022-09-14 06:40 -0700
                Re: Cake - C23 to C99 transpiler Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2022-09-07 10:28 -0700
                Re: Cake - C23 to C99 transpiler David Brown <david.brown@hesbynett.no> - 2022-09-07 20:05 +0200
            Re: Cake - C23 to C99 transpiler Thiago Adams <thiago.adams@gmail.com> - 2022-09-07 15:28 -0700
              Re: Cake - C23 to C99 transpiler Bart <bc@freeuk.com> - 2022-09-08 00:51 +0100
                Re: Cake - C23 to C99 transpiler Thiago Adams <thiago.adams@gmail.com> - 2022-09-08 05:20 -0700
                Re: Cake - C23 to C99 transpiler Bart <bc@freeuk.com> - 2022-09-08 16:41 +0100
                Re: Cake - C23 to C99 transpiler scott@slp53.sl.home (Scott Lurndal) - 2022-09-08 16:43 +0000
                Re: Cake - C23 to C99 transpiler Bart <bc@freeuk.com> - 2022-09-08 19:23 +0100
                Re: Cake - C23 to C99 transpiler Thiago Adams <thiago.adams@gmail.com> - 2022-09-08 09:59 -0700

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