[Development] Qt-5.9.0-beta on CentOS-6.8: one minor BTN_TRIGGER_HAPPY bug

Ed Leaver ewleaver at comcast.net
Thu Mar 23 22:54:20 CET 2017

Hi Thiago,

BTN_TRIGGER_HAPPYxy are a group of kernel #defines, apparently for 
drivers not supported by the 2.6 kernels. Here are my dev notes:

      ... Qt-5.8.0 then compiled against gcc-5.4.0 with only one minor
    does not compile on CentOS-6.8 (apparently) because the
    2.6.32-642.el6.x86_64 kernel is too old
    and does not define BTN_TRIGGER_HAPPYn (n=1,2,3,4). On Fedora 25
    these are in
    I patched qevdevgamepadbackend.cpp with those values:
    #ifndef BTN_TRIGGER_HAPPY1
             #define BTN_TRIGGER_HAPPY1 0x2c0
             #define BTN_TRIGGER_HAPPY2 0x2c1
             #define BTN_TRIGGER_HAPPY3 0x2c2
             #define BTN_TRIGGER_HAPPY4 0x2c3
    directly above QEvdevGamepadDevice::resetConfiguration(), and then
    the whole Qt-5.8.0 source compiles
    just fine (gcc-5.4.0), although there is a minor issue with final
    "make install" with /usr/bin/ld not having permission
    to open a file named "terminal". This might not be critical, need to
    see. It may be because I paused the
    CentOS-6 VM at one point during the build, when it was building on a
    partition NFS exported from the host.

    HOWEVER, the above #ifndef BTN_TRIGGER_HAPPY1 patch is
    unsatisfactory, as it allows
    m_buttonsMap[BTN_TRIGGER_HAPPY1] = QGamepadManager::ButtonLeft; etc
    assignments to array elements that the kernel probably does not know
    about. Far safer to
    disable this particular gamepad plugin in
    I'll probably never need this gamepad controller, and if I ever do,
    it won't be on CentOS-6

Thanks again,

On 03/23/2017 03:25 PM, Thiago Macieira wrote:
> On quinta-feira, 23 de março de 2017 13:57:07 PDT Ed Leaver wrote:
>> On 03/23/2017 01:43 PM, Thiago Macieira wrote:
>>> On quinta-feira, 23 de março de 2017 10:59:25 PDT Ed Leaver wrote:
>>>> will attempt gcc-4.8.2 -no-std=c++11 in the next few days. If you think
>>>> this worthwhile, have you a Qt-5.9.0-beta source tarball?
>>> You can't turn C++11 off since 5.7.0.
>> Thanks. Saved me some time and confusion. I didn't /personally/ wish to
>> turn off C++11 anyway. I'll try 5.7.0 then against gcc-4.8.2, but am
>> still interested in a 5.9.0-beta source tarball to test with gcc-5.4.0
>> and later, if such beta tarball becomes available.
> Hello Ed
> I have no idea what BTN_TRIGGER_HAPPY is. But you can simply disable qtgamepad
> entirely if you don't plan on using it. Either don't download it, or rm -rf
> the subdir after you've downloaded it, or pass -skip qtgamepad to the
> compilation.
> You should also report the failure to built from sources (FTBFS) and indicate
> which kernel version your headers are from. Since it's a macro, it is easy to
> just #ifdef around its existence. But I don't know whether the developer will
> accept the bug or they will say "sorry, your kernel is way too old, try
> upgrading".
> What kernel is that, BTW?

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