extern "C"

#21 09-06-2008, 07:10 PM

Ben Bacarisse wrote:
> Ian Collins <ian-news@hotmail.com> writes:
>
>> Ben Bacarisse wrote:
>>> Jerry Coffin <jcoffin@taeus.com> writes:

>>>>> Most c++ compiler support C99 unless you disable it in the command line.
>>>> Really? All the C++ compilers I have handy seem to reject the following
>>>> perfectly legal bit of C99 code:
>>>>
>>>> union {
>>>> char birthday[9];
>>>> int age;
>>>> float weight;
>>>> } people = { .age = 14 };
>>>>

>>> Recent versions of gcc accept it.
>>>
>> gcc also accepts VLAs, but I doubt any other C++ compiler would.
>
> I mean gcc accepts it when invoked with '-std=c99'. Jerry Coffin said
> it did not. I am reporting that at least some recent versions do (as
> they must if they want to compile C99).
>
> For the record, the same gcc correctly rejects (or at least diagnoses)
> VLAs when invoked as a conforming C++ compiler. The presence of a
> default mixed mode where a compiler accept some odd half-language plus
> extensions is unfortunate but common.
>
That (gcc correctly rejects VLAs in C++ mode) is good. One of my worst
poring form gcc to standard C++ nightmares was scores of gcc VLAs.

--
Ian Collins.

#22 09-06-2008, 10:37 PM

In article <878wu5ieu0.fsf@bsb.me.uk>, ben.usenet@bsb.me.uk says...

[ ... ]

> Recent versions of gcc accept it.

I'm glad to hear that. What I was using isn't exactly current, but it's
not terribly old either -- it's good to hear that they're apparently
making a real attempt at C99 compliance (finally...)

--
Later,
Jerry.

The universe is a figment of its own imagination.

#23 09-08-2008, 06:07 AM

Jerry Coffin a écrit :
> In article <48c0dbfe$0$17346$426a74cc@news.free.fr>,
> michael.doubez@free.fr says...
>
> [ ... ]
>
>> Most c++ compiler support C99 unless you disable it in the command line.
>
> Really? All the C++ compilers I have handy seem to reject the following
> perfectly legal bit of C99 code:
>
> union {
> char birthday[9];
> int age;
> float weight;
> } people = { .age = 14 };
>

True. I have overly generalized.
I was thinking of VLAs which tends to creep in so often. This code is
however accepted by my IAR c++ compiler.

More compliant c++ compiler will hopefully reject this code. But I guess
one could tweak them into accepting it.

--
Michael

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