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

[David Cole]

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> 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]
> 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> 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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