[CMake] Clang not using C++11 on Linux

[Rolf Eike Beer]

Am Samstag, 17. Januar 2015, 19:09:38 schrieb Robert Dailey:
> I'm running a custom built CMake 3.1 on Ubuntu Server 12. I have Clang
> 3.4 installed. At the top of my root CMakeLists.txt, I have enabled
> C++11 like so:
> 
> cmake_minimum_required( VERSION 3.1 )
> if( UNIX )
>     set( CMAKE_CXX_FLAGS "-std=c++11 -stdlib=libc++" )
> endif()
> project( FrontEnd )

[…]

> How do I get C++11 working?

Set the compiler flags after project(). The compiler is detected in project(), 
and then CMake initializes all the flag variables, so you changes will get 
overwritten.

If you just want to enable C++11 with CMake 3.1 then do

 set(CMAKE_CXX_STANDARD 11)

after the project call and CMake will take care of the rest.

Greetings,

Eike
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