[CMake] C++11 flag not being added

[Petr Kmoch]

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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