Qt 5.12 (Beta) + Android (Clang) = App Crash

Ray Gray · 9 Oct 2018, 12:05

I'm really glad that Qt 5.12 will (finally) supports Clang toolchain for Android targets. Trying current beta version, compilation on my Windows 10 machine goes smoothly as silk, however deployed apps ingloriously crash with the following error.

E AndroidRuntime: FATAL EXCEPTION: qtMainLoopThread
E AndroidRuntime: Process: org.qtproject.example.mousearea, PID: 25359
E AndroidRuntime: java.lang.UnsatisfiedLinkError: dlopen failed: cannot locate symbol "__emutls_get_address"

Same result with different configurations:

SDK version: 26.1.1 (latest)
NDKs: 10e,15c, 16b, 17c
android APIs: 22, 23, 27, 28
different target devices (phones)

Any ideas?

koahnig · wrote on 9 Oct 2018, 12:05

@Ray-Gray

In here ist says
Note: If your Qt version is earlier than v5.9, use the SDK tools package v25.2.5 or earlier.

Not sure if ot makes sense to have the most recent sdk version even if it does not explicit say so.

Ray Gray · 9 Oct 2018, 13:03

@koahnig

If I understand correctly, my Qt is > 5.9, therefore SDK tools > 25.2.5 should be fine .

Pablo J. Rogina · wrote on 9 Oct 2018, 13:03

@Ray-Gray you may consider Qt in [5.9 ... 5.12] a grey zone where clang is not well supported see this post for instance

Ray Gray · 9 Oct 2018, 13:27

@Pablo-J-Rogina

According to QTBUG-67464 and Markus' comment here, clang should be now fully supported.

koahnig · wrote on 9 Oct 2018, 13:27

@Ray-Gray

Did you check already on google's qt on android group?

Ray Gray · wrote on 9 Oct 2018, 13:32

@koahnig

Checked there, but the group seems quite inactive...

Ray Gray · 12 Oct 2018, 08:08

I finally managed to fix the problem. App doesn't crash when compiled with NDK16b!

install Android Studio (if not already installed)
download NDK16b and extract it to any location (in my case 'D:\sdk\android-ndk-r16b')
start Qt Creator
select menu Tools > Options > Devices, tab Android
set proper android SDK paths:
click OK
open your project (.pro)
Important! Delete folder containing previous (shadow) build (see path under 'Build directory'):
under Projects (left bar) > Build & Run, activate Android configuration
compile & run

koahnig · wrote on 12 Oct 2018, 08:08

@Ray-Gray

Great! Thanks for your feedback

matain · wrote on 16 Dec 2018, 03:55

hello,
I've got the similar problem when changing the Qt from 5.11.1 to 5.12.0
It seems like crashed when the Android App start openning.
After some tracing, I finally found that, the reason is, the App hasn't got the permissions of reading&writing local extra storage. After I add the according permissions mannualy (in system management) , the App runs OK.
The 'permission' also can be added by this way below:
http://amin-ahmadi.com/2015/11/29/how-to-add-permissions-to-your-qt-android-app/

Dabulla · wrote on 18 Dec 2018, 10:35

This post is deleted!