[CMake] C++11 flag not being added

Fri Oct 16 05:26:00 EDT 2015

Hello,

CMake 3.3.1 is available from my PPA, in case it helps:

https://launchpad.net/~pgquiles/+archive/ubuntu/ppa

On Fri, Oct 16, 2015 at 10:58 AM, Petr Bena <benapetr at gmail.com> wrote:

> If I did that nearly nobody would be able to compile my program as
> cmake >= 3.1 is extremely rare on most distributions. Even ubuntu's
> PPA builder has some ancient version.
>
> On Fri, Oct 16, 2015 at 9:44 AM, Petr Kmoch <petr.kmoch at gmail.com> wrote:
> > Hi Petr.
> >
> > You're using a feature (`CMAKE_CXX_STANDARD`) introduced in CMake version
> > 3.1, so you should require a minimum version >= that.
> >
> > You can learn the version of CMake by running `cmake --version`
> >
> > Petr
> >
> > On Thu, Oct 15, 2015 at 5:45 PM, Petr Bena <benapetr at gmail.com> wrote:
> >>
> >> What do you mean by "target" property? I don't see any target
> >> mentioned there. I don't have this line in there. I don't know which
> >> CMake this is, it failed on server we use for unit tests, but I have
> >> required min. version set to 2.8.7
> >>
> >>
> >>
> >> On Thu, Oct 15, 2015 at 5:41 PM, Matthew S Wallace
> >> <mwallace at ccmtrading.com> wrote:
> >> > What version of CMake are you using?  I’m using 3.3.2.  The only other
> >> > thing I did was:
> >> >
> >> > set_property(GLOBAL PROPERTY CXX_STANDARD_REQUIRED)
> >> >
> >> > I’m guessing this probably does nothing since it is probably a target
> >> > property.
> >> >
> >> > -Matt
> >> >
> >> >> On Oct 15, 2015, at 10:34 AM, Petr Bena <benapetr at gmail.com> wrote:
> >> >>
> >> >> Can you elaborate on it a bit?
> >> >>
> >> >> I put set(CMAKE_CXX_STANDARD 11) as first line of my CMakeLists and
> it
> >> >> still doesn't work, without the hack I used I get errors while
> >> >> compiling.
> >> >>
> >> >> Can you give me example file in which it works? I guess there is more
> >> >> needed for it to work.
> >> >>
> >> >> On Tue, Oct 13, 2015 at 7:12 PM, Matthew S Wallace
> >> >> <mwallace at ccmtrading.com> wrote:
> >> >>> Thanks, setting the global variable solved my issue.
> >> >>>
> >> >>> -Matt
> >> >>>
> >> >>>> On Oct 13, 2015, at 10:46 AM, Johannes Zarl-Zierl
> >> >>>> <johannes.zarl-zierl at jku.at> wrote:
> >> >>>>
> >> >>>> Hi,
> >> >>>>
> >> >>>> CXX_STANDARD is a target property, not a global one. You can either
> >> >>>> set
> >> >>>> CXX_STANDARD for every target that needs it, or set it globally by
> >> >>>> changing
> >> >>>> the default value.
> >> >>>>
> >> >>>> You can do the latter by setting the variable CMAKE_CXX_STANDARD
> >> >>>> before
> >> >>>> defining any target that depends on it:
> >> >>>>
> >> >>>> set(CMAKE_CXX_STANDARD 11)
> >> >>>>
> >> >>>> HTH,
> >> >>>> Johannes
> >> >>>>
> >> >>>> On Tuesday 13 October 2015 10:22:36 Matthew S Wallace wrote:
> >> >>>>> I have the following two lines in my CMakeLists.txt
> >> >>>>>
> >> >>>>> set_property(GLOBAL PROPERTY CXX_STANDARD 11)
> >> >>>>> set_property(GLOBAL PROPERTY CXX_STANDARD_REQUIRED)
> >> >>>>>
> >> >>>>> However when compiling some of my source files, the -std=c++11
> flag
> >> >>>>> is not
> >> >>>>> added.
> >> >>>>>
> >> >>>>> Just for good measure I added:
> >> >>>>> target_compile_features(my_target PRIVATE cxx_strong_enums) to the
> >> >>>>> target
> >> >>>>> that was having the problem.
> >> >>>>>
> >> >>>>> Not sure if it matters, but in this case the compile error I’m
> >> >>>>> getting is
> >> >>>>> complaining because I’m referencing a fully scoped enum.  If I
> >> >>>>> explicitly
> >> >>>>> include -std=c++11 in my compile flags, everything works.
> >> >>>>>
> >> >>>>> I’m thinking I’m probably just misunderstanding how CXX_STANDARD
> >> >>>>> works, but
> >> >>>>> any help would be appreciated.
> >> >>>>>
> >> >>>>> -Matt
> >> >>>>
> >> >>>> --
> >> >>>>
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> >>
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>
> Powered by 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:
>
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-- 
Pau Garcia i Quiles
http://www.elpauer.org
(Due to my workload, I may need 10 days to answer)
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