How do I build an arm interwork libgcc.a? FPA vs VFP?

[Dario Suarez Gracia]

Larry Fast wrote:

>I'm trying to build a mixed arm-thumb system and need an interwork enabled
>libgcc.a (I think).
>
>Normal builds of gcc produce a libgcc/  and libgcc/thumb directories.
>What configure options do I use to get an interwork library?  
>Or is my problem somewhere else?
>
>
>  
>
You should take a look in the ARM-Thumb Procedure Call Standart, because 
FPA and VPF are the two kinds of floating point instructions. And code 
for the FPA(VFP) architecture cannot execute on a VFP(FPA) 
implementation. So you cannot link code for both architectures.

Dario