Re: enums and switch vs function calls

From	Tim Rentsch <tr.17687@z991.linuxsc.com>
Newsgroups	comp.lang.c
Subject	Re: enums and switch vs function calls
Date	2025-04-06 03:17 -0700
Organization	A noiseless patient Spider
Message-ID	<86y0wdfvc0.fsf@linuxsc.com> (permalink)
References	<vsr0ml$1to9m$1@dont-email.me> <enum-20250405122329@ram.dialup.fu-berlin.de> <1ybIP.1259194$2zn8.458292@fx15.iad>

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scott@slp53.sl.home (Scott Lurndal) writes:

> ram@zedat.fu-berlin.de (Stefan Ram) writes:
>
>> Richard Harnden <richard.nospam@gmail.invalid> wrote or quoted:
>>
>>> int hex = colour_to_hex(10);
>>> ... then the compiler doesn't complain that 10 is not in the enum.
>>> Why?  Surely the compiler can tell.
>>
>>  I get
>>
>> |
>> |error: enum conversion when passing argument 1 of 'colour_to_hex' is
>> invalid in C++ [-Wc++-compat]
>> |      |int hex = colour_to_hex(10);
>> |      |                        ^~
>> |note: expected 'enum colour' but argument is of type 'int'
>> |      | int colour_to_hex(enum colour colour)
>> |      |     ^~~~~~~~~~~~~
>> |
>>
>>  with
>>
>> gcc -Wc++-compat
>
> That example exemplifies the seriously screwed up error reporting in the
> gnu compiler collection.
>
> One line of informative error message followed by 5 lines of useless
> cruft to wade through.  And no way to turn it off completely.

That's true, but it can be reduced to only two lines total (so only one
line more than needed), by using -fno-diagnostics-show-caret.

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enums and switch vs function calls Richard Harnden <richard.nospam@gmail.invalid> - 2025-04-05 11:29 +0100
  Re: enums and switch vs function calls scott@slp53.sl.home (Scott Lurndal) - 2025-04-05 14:58 +0000
    Re: enums and switch vs function calls Tim Rentsch <tr.17687@z991.linuxsc.com> - 2025-04-06 03:17 -0700
      Re: enums and switch vs function calls scott@slp53.sl.home (Scott Lurndal) - 2025-04-06 14:47 +0000
        Re: enums and switch vs function calls David Brown <david.brown@hesbynett.no> - 2025-04-06 17:16 +0200
        Re: enums and switch vs function calls Tim Rentsch <tr.17687@z991.linuxsc.com> - 2025-04-06 19:26 -0700
        Re: enums and switch vs function calls Ben Bacarisse <ben@bsb.me.uk> - 2025-04-25 01:12 +0100
          Re: enums and switch vs function calls scott@slp53.sl.home (Scott Lurndal) - 2025-04-25 16:56 +0000
            Re: enums and switch vs function calls Ben Bacarisse <ben@bsb.me.uk> - 2025-04-25 23:09 +0100
              Re: enums and switch vs function calls Tim Rentsch <tr.17687@z991.linuxsc.com> - 2025-05-04 06:55 -0700
        Re: enums and switch vs function calls Ben Bacarisse <ben@bsb.me.uk> - 2025-04-25 01:12 +0100
  Re: enums and switch vs function calls David Brown <david.brown@hesbynett.no> - 2025-04-05 17:43 +0200
  Re: enums and switch vs function calls Thiago Adams <thiago.adams@gmail.com> - 2025-04-05 12:53 -0300
    Re: enums and switch vs function calls David Brown <david.brown@hesbynett.no> - 2025-04-06 11:49 +0200

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