Using VPF on Android



  • Hello!

    I'm trying to use "-mfloat-abi=hard" option of compiler for using VPF on Android. So I made a standard widget-based project and added to project file this option. I got these linker errors:

    error: main.o uses VFP register arguments, output does not
    error: mainwindow.o uses VFP register arguments, output does not
    error: moc_mainwindow.o uses VFP register arguments, output does not
    collect2: error: ld returned 1 exit status

    My project file:

    @QT += core gui

    greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

    TARGET = test_VPF
    TEMPLATE = app

    QMAKE_CXXFLAGS += -mfloat-abi=hard

    SOURCES += main.cpp
    mainwindow.cpp

    HEADERS += mainwindow.h

    FORMS += mainwindow.ui

    CONFIG += mobility
    MOBILITY = @

    Using: Qt 5.2.0; Compiler: armeabi_v7a; Ubuntu 13.10
    Any suggestions?


  • Lifetime Qt Champion

    Hi,

    AFAIK, Qt is built for softfp, so you would need to build Qt yourself first modifying the android mkspec



  • @SGaist Hi,

    I have similar issue, when I tried to add a library, built for my android device, is included in my project. I get error "aaa.so uses VFP register arguments, output does not".

    So I need to build Qt for hardfp.

    I found qmake.conf in the path C:\Qt\Qt5.5.1\5.5\Src\qtbase\mkspecs\android-g++, but not sure what to specify to make it hardfp.

    Refering to Build Qt5.5 for Beaglebone I found to comment some part in COMPILER_FLAGS. But same is not found in android mkspec.

    Could you help to know what should I change to build it for hardfp.

    Thanks in advance :)


  • Lifetime Qt Champion

    Hi,

    AFAIK, you need to change -mfloat-abi from softfp to hard. Note that I don't have tested it.



  • @SGaist Thanks... I will update if it starts working...


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