Re: Why does 'static' cause an error ?

From	David Brown <david.brown@hesbynett.no>
Newsgroups	comp.lang.c
Subject	Re: Why does 'static' cause an error ?
Date	2017-04-24 10:16 +0200
Organization	A noiseless patient Spider
Message-ID	<odkc2k$8of$1@dont-email.me> (permalink)
References	<64abf1f2-1c45-4b1b-95cf-a88133813085@googlegroups.com> <lno9vmpu4w.fsf@kst-u.example.com>

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On 24/04/17 01:43, Keith Thompson wrote:
> fl <rxjwg98@gmail.com> writes:
>> After I copy a code snippet to a test .c project, I have such an error when
>> I carelessly add a 'static' key word at the beginning.
>>
>> "28 expression must have a constant value"
>>
>>
>>
>> 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])
>> 	    }
>> 	};
>> .............
>>
>>
>> Can you tell me why 'static' can cause such an error?
>> What rule does it violate?
> 
> The error message told you that the initializers have to be constant
> expressions.  An indexing operation is not a constant expression (even
> if it refers to an array object with constant initialization).
> 

I would also guess that the initialisation is incorrect, and should be:

	.ringBufPtr = &uartTivaRB[0],

(or just ".ringBufPtr = uartTivaRB,", but presumably someone thought it
was helpful to write it with the index).

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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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