Can this library work within a Qt project for Android using Qt Creator?

[daljit97]

I am using this library inside my Qt Project for Android. I am using Qt Creator and everything builds fine in Linux and I am able to run the program on my desktop without problems. However, when I try to compile the project for Android then I get errors like:
'to_string' is not a member of 'std' 'strtof' ist not a member of 'std' etc.

I know this is related to the NDK having issues with C++11. Is there any solution to make this work with Qt? I know in Android Studio is possible to edit the Application.mk, but is there any solution for Qt?
I am aware that this might not be an issue with the library itself, but wondering if there is someone that could help me solve this.

[nguoithichkhampha]

@daljit97 , I don't use Qt project for Android yet. But I can build successfully this library in a project for Android with cmake and ndk.
this is some info may useful for you
-- BUILD CORTEX FOR ANDROID ON APPLE -- Android: Targeting API '21' with architecture 'arm', ABI 'armeabi-v7a', and processor 'armv7-a' -- Android: Selected GCC toolchain 'arm-linux-androideabi-4.9' -- The C compiler identification is GNU 4.9.0 -- The CXX compiler identification is GNU 4.9.0 -- Check for working C compiler: /Users/sdkteam/usr/android/android-ndk-r10e/toolchains/arm-linux-androideabi-4.9/prebuilt/darwin-x86_64/bin/arm-linux-androideabi-gcc -- Check for working C compiler: /Users/sdkteam/usr/android/android-ndk-r10e/toolchains/arm-linux-androideabi-4.9/prebuilt/darwin-x86_64/bin/arm-linux-androideabi-gcc -- works -- Detecting C compiler ABI info -- Detecting C compiler ABI info - done -- Detecting C compile features -- Detecting C compile features - done -- Check for working CXX compiler: /Users/sdkteam/usr/android/android-ndk-r10e/toolchains/arm-linux-androideabi-4.9/prebuilt/darwin-x86_64/bin/arm-linux-androideabi-g++ -- Check for working CXX compiler: /Users/sdkteam/usr/android/android-ndk-r10e/toolchains/arm-linux-androideabi-4.9/prebuilt/darwin-x86_64/bin/arm-linux-androideabi-g++ -- works

[nlohmann]

Please have a look at the section https://github.com/nlohmann/json#supported-compilers - it explicitly mentions the 'to_string' is not a member of 'std' error message.

[daljit97]

@nlohmann thanks for that. As suggested at that page, the NDK uses an old stl implementation and the solution is to modify Application.mk in an Android project or "manually" implement the missing functions using templates. Now I would really like to avoid the second option and the first option is not viable to me since a Qt Project usually don't generate .mk files and I am not aware of how to incorporate them in my project.

[daljit97]

@nguoithichkhampha hmm cmake might be a possibility (but I am not familiar with it), however I am using the default qmake that is used in Qt Creator.

[nlohmann]

@daljit97 Do you need further assistance?