[CMake] [ANNOUNCE] CMake 3.1.0-rc1 now ready for testing!

[Daniel Schepler]

Thanks for the pointers, that does answer my question.  I would just set CXX_STANDARD to 11 and leave CXX_STANDARD_REQUIRED unset.
--
Daniel

From: David Cole [mailto:DLRdave at aol.com]
Sent: Wednesday, October 29, 2014 11:38 AM
To: Daniel Schepler
Cc: cmake at cmake.org
Subject: Re: [CMake] [ANNOUNCE] CMake 3.1.0-rc1 now ready for testing!

I think your question about CXX_STANDARD is answered in the CXX_STANDARD docs:
http://www.cmake.org/cmake/help/v3.1/prop_tgt/CXX_STANDARD.html

If you MUST have it, you can set this property to ON:
http://www.cmake.org/cmake/help/v3.1/prop_tgt/CXX_STANDARD_REQUIRED.html

(Although I've not used it myself -- not sure what happens if the compiler does not support the standard. Hopefully, an error at CMake time... try it and let us know if it works for you.)


HTH,
David C.


On Wed, Oct 29, 2014 at 2:15 PM, Daniel Schepler <dschepler at scalable-networks.com<mailto:dschepler at scalable-networks.com>> wrote:
(Whoops, accidentally sent this via private email before.)

My question was about this part of the example:

add_executable(consumer_with consumer_with.cpp)
target_link_libraries(consumer_with foo)
set_property(TARGET consumer_with CXX_STANDARD 11)

add_executable(consumer_no consumer_no.cpp)
target_link_libraries(consumer_no foo)

The question is: how do I detect whether CXX_STANDARD 11 is available before running the "set_property(TARGET consumer_with CXX_STANDARD 11)" line?
--
Daniel


-----Original Message-----
From: Robert Maynard [mailto:robert.maynard at kitware.com<mailto:robert.maynard at kitware.com>]
Sent: Wednesday, October 29, 2014 10:43 AM
To: Daniel Schepler
Cc: CMake MailingList
Subject: Re: [CMake] [ANNOUNCE] CMake 3.1.0-rc1 now ready for testing!

You can find the known compile features that can be detected at:
http://www.cmake.org/cmake/help/v3.1/prop_gbl/CMAKE_CXX_KNOWN_FEATURES.html

At the end of the compile-features manual page ( http://www.cmake.org/cmake/help/v3.1/manual/cmake-compile-features.7.html
) there is a section on how to mark a library as having conditional support on C++11 features.


On Wed, Oct 29, 2014 at 12:58 PM, Daniel Schepler <dschepler at scalable-networks.com<mailto:dschepler at scalable-networks.com>> wrote:
> Where would I find the list of available C++ language features?  For instance, I would suppose there's one for "auto", one for move constructors/assignment operators, and one for "= delete" of default constructors/destructors et al.  These are probably the ones we'd be most interested in here, for the moment.  (Though with our requirements to support older C++ compilers, we might not actually be able to use auto, as the fallback would need the full type anyway.)  Also, is there a portability macro provided for the "= delete" feature?
>
> Also, how would I mark a target so that it activates C++11 features if available, but falls back to old C++ if not?  I do see the section on detecting compiler features, but it's not clear to me how exactly how I'd make the target use CXX_STANDARD 11 only if available.
> --
> Daniel
>
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