[cfe-dev] New C++0x feature support in Clang

[Christopher Jefferson]

On 29 Jan 2011, at 19:13, Larry Evans wrote:

> On 01/29/11 05:16, Larry Evans wrote:
>> On 01/26/11 15:45, Douglas Gregor wrote:
>>> Clang has recently gotten much-improved support for the upcoming
>>> C++0x standard. In particular, top-of-tree Clang now supports a
>>> number of C++0x features:
>>> 
>>> 	- Rvalue references (including rvalue references for *this)
>>> 	- Variadic templates
>>> 	- Inline namespaces
>>> 	- Late-specified return types
>>> 	- Decltype
>>> 
>>> You can turn on C++0x support with the -std=gnu++0x (or, if you want
>>> to be more pedantic, -std=c++0x).
>>> 
>>> Give it a spin, write some tests, try it out with libc++, and tell
>>> us how it went!
>> 
>> Thanks Doug.
>> 
>> It worked fine with:
>> 
>> template<typename... T>
>> struct A
>> {
>>    static unsigned const size=sizeof...(T);
>> };
>> 
>> int main(void)
>> {
>>    return A<int,int,int>::size;
>> }
>> 
> Just #including iostream causes problems, as shown by
> compile of the following test.cpp:
> 
>  #include <iostream>
>  int main(void)
>  {
>    std::cout<<"Hello World!\n";
>    return 0;
>  }

The problem you are seeing is that adding -std=c++0x adds a bunch of new g++-specific extensions to libstdc++ (the g++ standard library implementation). To make clang work on linux these all need supporting (or libc++ needs porting over).

Chris