Re: Why does 'static' cause an error ?

From	Ben Bacarisse <ben.usenet@bsb.me.uk>
Newsgroups	comp.lang.c
Subject	Re: Why does 'static' cause an error ?
Date	2017-04-24 13:14 +0100
Organization	A noiseless patient Spider
Message-ID	<87vapuypde.fsf@bsb.me.uk> (permalink)
References	<64abf1f2-1c45-4b1b-95cf-a88133813085@googlegroups.com> <Dd8LA.805271$0k4.555569@fx37.am4> <lnk26apu2m.fsf@kst-u.example.com>

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Keith Thompson <kst-u@mib.org> writes:

> bartc <bc@freeuk.com> writes:
>> On 23/04/2017 19:17, fl wrote:
> [...]
>>> static	const UART_HWAttrs uartHWAttrs[EK_UARTCOUNT] = {
>>> 	    {
>>> 	        .baseAddr = UART0_BASE,
>>> 	        .intNum = INT_UART0,
>>> 	        .intPriority = (~0),
>>> 	        .flowControl = UART_FLOWCONTROL_NONE,
>>> 	        .ringBufPtr  = uartTivaRB[0],
>>> 	        .ringBufSize = sizeof(uartTivaRB[0])
>>> 	    }
>>> 	};
> [...]
>> Presumably one of those expressions isn't a compile time one.
>>
>> Add // in front of each. The error should go away. Then remove the //s 
>> one by on until it comes back. (Watch out for a trailing comma on the 
>> last uncommented line causing a syntax error.)
>>
>> (Maybe uartTivarRB isn't a flat array, but a pointer?)
>
> It doesn't matter.  uartTivaRB[0] isn't a constant expression even if
> uartTivarRB is a "flat array".  See N1570 6.6.

But uartTivaRB might be a 2D array.  I know it's unlikely, but with no
further information uartTivaRB[0] is not ruled out as an initializer by
6.6.

The final part of the last sentence about address constants is not 100%
clear (to me) but I don't think it applies here.  It says

  "The array-subscript [] ... may be used in the creation of an address
  constant, but the value of an object shall not be accessed by use of
  these operators."

If uartTivaRB[0] has array type, I don't think the [] operator accesses
the value of an object.

-- 
Ben.

Thread

Why does 'static' cause an error ? fl <rxjwg98@gmail.com> - 2017-04-23 11:17 -0700
  Re: Why does 'static' cause an error ? Noob <root@127.0.0.1> - 2017-04-23 22:00 +0200
    Re: Why does 'static' cause an error ? Richard Heathfield <rjh@cpax.org.uk> - 2017-04-23 22:22 +0100
  Re: Why does 'static' cause an error ? bartc <bc@freeuk.com> - 2017-04-23 21:34 +0100
    Re: Why does 'static' cause an error ? Keith Thompson <kst-u@mib.org> - 2017-04-23 16:45 -0700
      Re: Why does 'static' cause an error ? fl <rxjwg98@gmail.com> - 2017-04-23 17:44 -0700
        Re: Why does 'static' cause an error ? Andrey Tarasevich <andreytarasevich@hotmail.com> - 2017-04-23 20:26 -0700
      Re: Why does 'static' cause an error ? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-04-24 13:14 +0100
        Re: Why does 'static' cause an error ? Nick Bowler <nbowler@draconx.ca> - 2017-04-24 18:20 +0000
  Re: Why does 'static' cause an error ? Jerry Stuckle <jstucklex@attglobal.net> - 2017-04-23 17:52 -0400
    Re: Why does 'static' cause an error ? jacobnavia <jacob@jacob.remcomp.fr> - 2017-04-24 00:57 +0200
  Re: Why does 'static' cause an error ? Keith Thompson <kst-u@mib.org> - 2017-04-23 16:43 -0700
    Re: Why does 'static' cause an error ? David Brown <david.brown@hesbynett.no> - 2017-04-24 10:16 +0200

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