[Buildroot] flags to build Qt5 for AMD Geode LX arch ?

[David Picard]

Hello,

I fixed it. So for the record, the solution was :
BR2_PACKAGE_QT5BASE_CUSTOM_CONF_OPTS="-no-sse2"

Got it from Qt's configure utility :
$ configure --help

Regards,
David

Le 30/01/2019 à 11:21, David Picard a écrit :
> Hello,
>
> With this search :
> $ cd build
> $ grep "\-msse2" $(find ./ -name "Makefile*")
>
> I can see that only Qt5 uses the SSE2 instruction set that my CPU 
> doesn't support.
>
> Can anyone help me remove this flag ? Should I patch the qt5* packages 
> somehow ?
>
> Thanks.
>
> Le 30/01/2019 à 08:46, David Picard a écrit :
>> Hello,
>>
>> I'm sorry, my message was not clear, it seems. To put it in a 
>> nutshell : as soon as a program is linked to Qt5, it crashes with a 
>> SIGILL. Everything else works : X11, framebuffer, network, and my own 
>> programs (provided they are not linked to Qt5).
>>
>> More interesting :
>> I found by DuckDucking that the faulty instruction may be part of the 
>> SSE2 instruction set. My CPU doesn't support this.
>> build/qt5base-5.11.2/src/corelib/Makefile has "-msse2" in CFLAGS and 
>> CXXFLAGS.
>>
>> Could you help me get rid of this flag ? I'm connected on the IRC 
>> channel today as "dplamp".
>>
>> I did select all the Geode stuff :
>> - Builroot config : BR2_x86_geode=y, 
>> BR2_PACKAGE_XDRIVER_XF86_VIDEO_GEODE=y
>> - Kernel config : CONFIG_MGEODE_LX=y, CONFIG_FB_GEODE=y, 
>> CONFIG_FB_GEODE_LX=y
>>
>>
>> Le 29/01/2019 à 19:33, Yann E. MORIN a écrit :
>>> David, All,
>>>
>>> On 2019-01-29 19:28 +0100, David Picard spake thusly:
>>>> I can build Qt5 successfully. I tested my custom application in 
>>>> QEMU, with
>>>> the same disk.img that I use on the read target (AMD Geode LX).
>>>>
>>>> But on the target, whenever I link one of my programs with Qt5, it
>>>> terminates straight away with a SIGILL (illegal instruction). 
>>>> Including a
>>>> simple printf("Hello world") that doesn't include nor call in Qt5.
>>> [--SNIP--]
>>>> I thought I could pass e.g. -march=geode when I build Qt. But I 
>>>> don't know
>>>> how to do it. I noticed a arch.conf file in the build directory but 
>>>> it gest
>>>> overwritten when I make qt5base-reconfigure...
>>> Well, if even a program that is not linked to Qt failes, you won;t 
>>> solve
>>> that by only "fixing" it in Qt...
>>>
>>> In that cas, since your processor is a geode, you have to confiugyure
>>> Buildroot to generate code for that processor, i.e.: BR2_x86_geode=y
>>>
>>> Regards,
>>> Yann E. MORIN.
>>>
>>
>
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