[CMake] Setting CXX_STANDARD 11 Enables GNU Extensions

[Michael Jackson]

Cool, I think that is what I want.

-- 
Mike Jackson


Roman Wüger wrote:
> 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.html
>
> 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:CXX_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!
>
>     --
>
>     Powered by www.kitware.com <http://www.kitware.com>
>
>     Please keep messages on-topic and check the CMake FAQ at:
>     http://www.cmake.org/Wiki/CMake_FAQ
>
>     Kitware offers various services to support the CMake community. For
>     more information on each offering, please visit:
>
>     CMake Support: http://cmake.org/cmake/help/support.html
>     CMake Consulting: http://cmake.org/cmake/help/consulting.html
>     CMake Training Courses: http://cmake.org/cmake/help/training.html
>
>     Visit other Kitware open-source projects at
>     http://www.kitware.com/opensource/opensource.html
>
>     Follow this link to subscribe/unsubscribe:
>     http://public.kitware.com/mailman/listinfo/cmake
>