[dev] undefined reference to `__multi3'

[Jack]

On 2018.11.07 13:29, Yuri Chornoivan wrote:
> Hi,
> 
> Below is the discussion in the Mageia development mailing list.
> 
> Can this problem be fixed on KMyMoney side?
> 
> Thanks in advance for your answers.
> 
> Best regards,
> Yuri
> 
> ----------  Переслане повідомлення  ----------
> 
> Тема: Re: [dev] undefined reference to `__multi3'
> Дата: середа, 7 листопада 2018 р., 20:15:33 EET
> Від: David GEIGER <geiger.david68210 at gmail.com>
> Кому: dev at ml.mageia.org
> 
> Le mer. 7 nov. 2018 à 18:36, Zézinho <lists.jjorge at free.fr> a écrit :
> 
> > I get a strange build error for kmymoney 5.0.2 on MGA6 i586, which I
> > cannot reproduce building here in x86_64.
> >
> > CMakeFiles/kmm_mymoney.dir/mymoneyforecast.cpp.o: In function
> > `MyMoneyForecastPrivate::calculateAccountTrendList()':
> >
> > /home/iurt/rpmbuild/BUILD/kmymoney-5.0.2/kmymoney/mymoney/
> mymoneyforecast.cpp:682:
> > undefined reference to `__multi3'
> >
> > Hint welcome
> >
> >
> This is the commit who seems in fault :
> 
> https://github.com/KDE/kmymoney/commit/
> 11fa00ff2b8ae64109d9b74ecfa6f0c80b2daa76#diff-b71dd6e10f60f135bc55ff677b48f3b1
> -----------------------------------------------
I may be out of my league here, but gcc docs say "The integer  
arithmetic routines are used on platforms that don’t provide hardware  
support for arithmetic operations on some modes." where  "These  
functions return the remainder of the signed division of a and b."  
includes "Runtime Function: long long __multi3 (long long a, long long  
b)"

Several google results imply that call may not be present on  
architectures other than amd64 (I see cases for MIPS where it looks  
like there ended up being a kernel patch for it) and using gcc7.  Given  
the failure here is on MGA6 i586, I'm not sure if the fix should or  
even can be in KMM itself, or whether gcc needs to better deal with  
other architectures?

However, note I'm not a KMM developer, so one of them will need to say  
something here.

Jack