[CMake] Setting CXX_STANDARD 11 Enables GNU Extensions

[Roman Wüger]

Hi,

 

you must set the following in the root CMakeLists.txt file:

 

set(CMAKE_CXX_STANDARD 11)

set(CMAKE_CXX_STANDARD_REQUIRED ON)

 

Did you mean that?

 

http://www.cmake.org/cmake/help/v3.2/variable/CMAKE_CXX_STANDARD.html

http://www.cmake.org/cmake/help/v3.2/variable/CMAKE_CXX_STANDARD_REQUIRED.ht
ml

 

Best Regards

Roman

 

Von: CMake [mailto:cmake-bounces at cmake.org] Im Auftrag von Michael Jackson
Gesendet: Sonntag, 05. Juli 2015 18:07
An: cmake at cmake.org
Betreff: Re: [CMake] Setting CXX_STANDARD 11 Enables GNU Extensions

 

Is there a project wide CXX_STANDARD_REQUIRED that I can set? I am wanting
to migrate our project to C++ 11 and would rather set something in the
project root rather than find every place where our own and our customers
plugin codes create a target.

 

Thanks

Mike Jackson

 

On Jul 4, 2015, at 5:13 PM, digitalriptide <digitalriptide at gmail.com
<mailto:digitalriptide at gmail.com> > wrote:





Thank you for the pointers, adding 

set( CMAKE_CXX_EXTENSIONS OFF )

to the root CMakeLists.txt disabled the extensions through the project.

 

On Sat, Jul 4, 2015 at 3:52 PM, Thompson, KT <kgt at lanl.gov
<mailto:kgt at lanl.gov> > wrote:

Try setting CMAKE_CXX_EXTENSIONS this to OFF.

 

http://www.cmake.org/cmake/help/v3.2/prop_tgt/CXX_EXTENSIONS.html#prop_tgt:C
XX_EXTENSIONS

 

From: CMake [mailto:cmake-bounces at cmake.org <mailto:cmake-bounces at cmake.org>
] On Behalf Of Scott Aron Bloom
Sent: Saturday, July 04, 2015 1:17 AM
To: digitalriptide; cmake at cmake.org <mailto:cmake at cmake.org> 
Subject: Re: [CMake] Setting CXX_STANDARD 11 Enables GNU Extensions

 

This is why I don’t use the CXX_STANDARD and instead use the CXX_FLAGS and
add the flag I need.

 

From: CMake [mailto:cmake-bounces at cmake.org] On Behalf Of digitalriptide
Sent: Friday, July 3, 2015 1:56 PM
To: cmake at cmake.org <mailto:cmake at cmake.org> 
Subject: [CMake] Setting CXX_STANDARD 11 Enables GNU Extensions

 

If I enable C++11 for some target via

set_target_properties( SomeTarget PROPERTIES CXX_STANDARD 11 )

set_target_properties( SomeTarget PROPERTIES CXX_STANDARD_REQUIRED ON )

with GCC, the code will then compile with -std=gnu++11. Compiling with
-std=gnu++11 enables C++11 *and* the GNU extensions. Is there an option that
will result in -std=c++11 in lieu of -std=gnu++11, to build without the the
GNU extensions?

 

Thank you!

 

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