[CMake] c++2a

[Angel Campoverde]

Hi,

No, It does not work, I told Cmake to use c++ 20, but it still goes back to
c++17. You can see what I get here:

https://pastebin.com/5ub18cMU

my CMakeLists.txt is here:

https://pastebin.com/3bwMKrWB

do you know what could be the problem?

Cheers.

On Tue, May 7, 2019 at 2:33 AM Mateusz Loskot <mateusz at loskot.net> wrote:

> On Tue, 7 May 2019 at 01:15, Angel Campoverde
> <campoverdeangelf at gmail.com> wrote:
> >
> > I am looking at:
> >
> > https://cmake.org/cmake/help/v3.14/prop_tgt/CXX_STANDARD.html
> >
> > and I see that I can pass 20, for c++20. However I do not have that in
> my compiler,
> > I only have c++2a and gnu++2a, this means that CMake goes back to c++17
>
> No, it doesn't mean that.
>
> The valid values documented for CXX_STANDARD are CMake generalisation
> and not what is directly passed via -std= or /std: or whatever option
> your compiler uses.
>
> If you run this cmake command
> cmake -DCMAKE_CXX_STANDARD=20 -DCMAKE_CXX_EXTENSIONS=OFF ..
> and then
> VERBOSE=1 make
> you will clearly see that CMake generated the compiler
> command lines with -std=c++2a
>
> IFF, you are using version of GCC or clang that supports c++2a, obviously
> (i.e. GCC 8/clang 6 or later. I'm not entirely confident about clang)
>
> Best regards,
> --
> Mateusz Loskot, http://mateusz.loskot.net
> --
>
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