Re: Soft motor won't compile with GNU g++ 3.4 and beyond

["Ronald L. Sluiter" <sluiter@aps.anl.gov>]

Peter,

The first "stanza" has been removed from the next motor record release; 
i.e., R5-7.
I don't recall which combination of compiler and/or EPICS base versions 
required the cast.

Ron


Denison, PN (Peter) wrote:

> Extract from devSoft.cc (in motor/motorApp/SoftMotorSrc/)
>
> void soft_motor_callback(CALLBACK *cbptr)
> {
> #ifdef __GNUG__
>    struct motorRecord *mr;
>
>    callbackGetUser((void *) mr, cbptr);
>    soft_process(mr);
>
> #else
>    void *mr;
>
>    callbackGetUser(mr, cbptr);
>    soft_process((motorRecord *) mr);
> #endif
> }
>
> Compiling this on g++ 3.4.3 results in:
> ../devSoft.cc: In function `void soft_motor_callback(CALLBACK*)':
> ../devSoft.cc:297: error: ISO C++ forbids cast to non-reference type
> used as lvalue
>
> But removing the whole chunk inside the #ifdef does compile, on g++
> 3.4.3
> Either chunk compiles on g++ 3.2.2
>
> Does anyone know which versions of the GNU C++ compiler actually
> required the first stanza? Can it be removed completely, since all
> newish g++ versions work with the second stanza?
>
> Peter Denison, Senior Software Engineer
> Diamond Light Source Ltd., Diamond House, Chilton, Didcot, Oxon, OX11
> 0DE
> Tel: +44 1235 778511
>