Issue
I've successfully configured and built some Qt5 applications for Android using CMake and this CMake utility.
Everything worked fine until I switched from Qt5.6 to Qt5.7. When I try to configure I get an CMake error which doesn't help me much:
-- Configuring done
CMake Error in CMakeLists.txt:
No known features for CXX compiler
"GNU"
version 4.9.
-- Generating done
-- Build files have been written to: /path/to/build-dir
I run CMake like this:
ANDROID_SDK=/path/to/android-sdk-linux \
ANDROID_NDK=/path/to/android-ndk-r12 \
QT_ANDROID_ROOT=/path/to/Qt-5.7.0-android \
JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk \
ANT=/usr/bin/ant \
cmake /path/to/CMakeLists.txt \
-DCMAKE_PREFIX_PATH=$QT_ANDROID_ROOT \
-DCMAKE_TOOLCHAIN_FILE=/path/to/android.toolchain.cmake
I can reproduce this behavior with a minimal C++ program:
#include <iostream>
int main() { std::cout << "hi" << std::endl; }
and a minimal CMakeLists.txt
:
cmake_minimum_required(VERSION 3.1)
find_package(Qt5Core)
add_executable(foo main.cpp)
target_link_libraries(foo Qt5::Core)
The line that introduces this error is target_link_libraries(foo Qt5::Core)
- without it the program configures and compiles fine.
Here are some things I tried:
use different NDK API levels by setting
ANDROID_NATIVE_API_LEVEL
toandroid-8
,9
,16
,18
and some other values that worked somwhere else (building Qt5.7 automatically usesandroid-16
)use different
NDK
releases (10e worked for me with Qt5.6, current is 12)tried prebuilt Qt5.7 rather than home-grown from GitHub
Until now I just combined different versions of SDK/NDK/Qt/NDK_API_LEVEL but honestly I just don't know what I'm doing..
You could help me by:
- telling me what I've done wrong (best!)
- elaborate on that CMake error to give me a hint
- provide me with a working CMake/Android/Qt5.7 example which I can use myself to find the problem
Solution
As a workaround (from here) you can comment out the line
set_property(TARGET Qt5::Core PROPERTY INTERFACE_COMPILE_FEATURES cxx_decltype)
in lib/cmake/Qt5Core/Qt5CoreConfigExtras.cmake file
Answered By - cdovgal
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