configure a Qt5 5.7 application for Android with CMake
Solution 1
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
Solution 2
For me, the trick was to clean all configuration and temporary build files and force a reconfiguration of the project:
- Close Qt Creator
- Remove manually
- Qt build folders
- All
.pro.user
and.cmake.user
files - All CMake build folders
- Re-open the project
Solution 3
I agree that the message is not very helpful, so no my answer is a guess. It seems like cmake fails to detect your toolchain (GCC) correctly, and this is related to cmake internals, not necessarily your script.
I found a related question: "no known features for CXX compiler" when compiling with MSVC++ 2013
Also, if you google '"No known features for CXX compiler" cmake' there will be some bug reports for cmake in the search result.
What you can try is to update the cmake version, if one is available. If the problem persist I suggest to use the cmake-users mailing list or IRC channels to sort out the problem.
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frans
Updated on July 29, 2022Comments
-
frans over 1 year
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