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using -msoft-float in rtems

Hi all,
I' have a running sparc(leon2) running on a xsv800 board. Now I want to run
some apps using floating point ops.
since I have no FPU I used the -msoft-flaot option during compiling.
So far so good. but this only worked for a leon application WITHOUT rtems.
When I compile the same program for rtems the compiler seems not to use the
emulated floating point ops?

running the program with tsim (without  -nfp) than it works.
Has anyone an idea?