linking against qt5 breaks c++14

[Nils Schmidt]

I use cmake to build a project which uses qt5. In zesty and artful compiling fails with:

error: ‘remove_reference_t’ is not a member of ‘std’

I created a minimal example and found out that linking against qt5 like this: target_link_libraries(testlib Qt5::Core) leads to the compiler not finding c++14 types. If I remove Qt5::Core from the line the minimal example compiles.

I use a line like this to compile:
cd ~/cmake_bug/build && rm -rf * && cmake -D CMAKE_BUILD_TYPE=Release ../src && make

The problem does NOT affect 16.04. With 16.10 I don't know.

[Nils Schmidt (nils-p-schmidt)]

Seems to be related to https://gitlab.kitware.com/cmake/cmake/issues/16608 so there is a workaround: SET(CMAKE_CXX_STANDARD 14)

[Gianfranco Costamagna (costamagnagianfranco)]

So, I don't think this is a bug, moreover how can you have cmake 3.9 on 16.04?

I tested on 17.04 and works with that SET(CMAKE_CXX_STANDARD 14)

[Launchpad Janitor (janitor)]

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