Re: [Xen-devel] [PATCH 4/7] arm: smccc: handle SMCs according to SMCCC

[Julien Grall <julien.grall@xxxxxxx>]

Hi,

On 17/08/17 13:35, Volodymyr Babchuk wrote:
> I wrote this small test program:
>
> #include <stdio.h>
>
> struct test
> {
>         int a[2];
> };
>
> int main (int argc, char* argv[])
> {
>         printf("%d\n", ((struct test){{1,2}}).a[0]);
>         return 0;
> }
>
> It is compiles with gcc --std=c89 without warnings.
This is because GCC supports compounds literals in C89 as an extension 
(see [1]).
> > > > > > +        ((d0) << 24 | (d1) << 16 | (d2) << 8 | (d3) << 0),              \
> > > > > > +        ((d4) << 24 | (d5) << 16 | (d6) << 8 | (d7) << 0)}})
> > > > > > +
> > > [1] http://port70.net/~nsz/c/c89/c89-draft.html#3.5.7
> > ... this also doesn't have anything like that.
> I'm sorry, I don't get what do you mean under "this".
The web page does not mention (<type>){<initializers>}. Which is normal 
because this also appears in c99 (see [2]).
> > Jan
Cheers,

[1] https://gcc.gnu.org/onlinedocs/gcc-4.3.1/gcc/Compound-Literals.html
[2]  http://en.cppreference.com/w/c/language/compound_literal

--
Julien Grall

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