Add support for Android NDK 12

[wonder-sk]

No description provided.

[m-kuhn]

Thanks @wonder-sk Happy to merge if it helps.
In the future we will need to switch to clang. gcc has been deprecated in the ndk and Qt 5.7 no longer compiles (requires C++11).

[wonder-sk]

I have few more changes in recipes pending... stay tuned :-)

[wonder-sk]

By the way, how do you mean Qt 5.7 no longer compiles with gcc? Qt project ships 5.7 for armv7 and if I understand correctly it is built with g++

[m-kuhn]

I didn't manage with a quick test (errored out on C++11 features), I think the gcc version shipped with the NDK is just very, very old.

[wonder-sk]

Got such problem too, but it's obviously just something dodgy with Qt5.7 vs cmake.

How to fix it - in Qt/5.7/android_armv7/lib/cmake/Qt5Core/Qt5CoreConfigExtras.cmake

Replace this line:

set_property(TARGET Qt5::Core PROPERTY INTERFACE_COMPILE_FEATURES cxx_decltype)

By this one:

set(CMAKE_CXX_STANDARD 14)

https://bugreports.qt.io/browse/QTBUG-54666
http://public.kitware.com/pipermail/cmake-developers/2016-July/029005.html

[m-kuhn]

Thanks for the hint, will try next week!

[wonder-sk]

@m-kuhn Ready to me merged... everything builds for me (NDK 12 + Qt 5.7 with the patch above)

[m-kuhn]

Nice!
I wonder if this could be integrated in the android.toolchain file so it
would work with a vanilla Qt 5.7 SDK.

On 23/09/16 08:33, Martin Dobias wrote:

@m-kuhn https://github.com/m-kuhn Ready to me merged... everything
builds for me (NDK 12 + Qt 5.7 with the patch above)

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[wonder-sk]

Hmmm I don't really dare to try that: 1. it is something deep inside Qt5's cmake config, 2. it may just go away with a different combination of cmake/qt versions 3. android.toolchain should be generic config without special Qt stuff

[m-kuhn]

android.toolchain is a collection of hacks and poorly implemented, there
are a zillion of different versions out there (see e.g.
taka-no-me/android-cmake#81 (comment)).
If there's anything at all that can be done, I don't mind at all.

On 23/09/16 09:13, Martin Dobias wrote:

Hmmm I don't really dare to try that: 1. it is something deep inside
Qt5's cmake config, 2. it may just go away with a different
combination of cmake/qt versions 3. android.toolchain should be
generic config without special Qt stuff

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[m-kuhn]

Thanks, good stuff!

Were you able to compile QGIS as well? I had trouble with the GCC version check here which failed so it was compiled without C++11 but it worked if I removed the check (and I wonder if we could just require C++11 on QGIS anyway to "fix" this).

[wonder-sk]

Yeah QGIS 2.14 compiled just fine for me - I didn't encounter any problem with GCC version check...