Using VPF on Android

[alan73]

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?

[SGaist]

Hi,

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

[Abin]

@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 :)

[SGaist]

Hi,

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

[Abin]

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