gcc: why is "abcdef" not a constant (error: initializer element is not constant)
Fri May 8 14:24:00 GMT 2015
On 05/08/2015 02:34 PM, m-h-l wrote:
> I guess you refer to this part of the standard:
> "The array-subscript  and member-access . and -> operators, the address &
> and indirection * unary operators, and pointer casts 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."
I do. And that language is the same evenin C11.
> Funny thing is that g++, ArmC and ICC do not have a problem with "abcdef"
> as an initializer.
g++ is a different language. C++ constants are different. I don't
know about ArmC and ICC. Perhaps it's an extension, or perhaps their
authors didn't properly distinguish between C and C++.
> So I wonder what shall be the sense to forbid this in gcc.
It is the standard.
> This way I cannot use gcc to calculate e.g. CRCs or Hashs over real constant
> things at build time without extra tools, even not in such a clear case as
> here. With the other compilers its no problem.
Well, you can regret writing in C if you like. But don't argue with
us: argue with the authors of the standard. Complaining about a
language standard to people who didn't write it is the height of
futility. If you want C++, write in C++. Or find some other way
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