Re: [gentoo-dev] How to support C++11 in libraries?

[Sven Eden <sven.eden@gmx.de>]

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Am Mittwoch, 18. Dezember 2013, 08:54:47 schrieb Michał Górny:
> This raises the following question: how do we want to do it? I see two
> possibilities:
> 
> a) adding USE=c++11 and USE-deps to all the packages in question,
> 
> b) doing the switch via synchronous version bump and matching
> dependencies.
>
(snip)
> 
> What are your thoughts?

I have already switched to C++11 on all my projects ages ago. It offers a lot, 
and the incompatibilities are rare at best.

C++11 is the current standard with the next being worked on already.
What is the rationale for staying with C++03 or (worse) C++98 in the first 
place? Nothing is gained. Only the need to fix what becomes broken.

( And a lot breakage can occur from using something like
#include <tr1/cstdint>
Instead of the C++11
#include <cstdint>
... Breakages that are trivial to fix ... )

And as C++11 is stricter in many places, I consider a program failing to 
compile with -std=c++11 to be broken and buggy per se, and needing to be fixed 
asap anyway. (I consider any C program failing to compile with g++ broken as 
well, allthough the cases might be more complex.)

So I'd go the reverse way. Make CXXFLAGS="-std=c++11" the default, and only  
override this for packages that do fishy stuff and break with it.

But of course this must be tested thoroughly first. I have some extra time to 
spare in the first three weeks of january, and I've already planned to do an 
'emerge -e @world' with c++11 as a global default anyway.


Cheers

Sven

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