Changing compilation options for BSP building

Jiri Gaisler jiri at
Tue Feb 7 18:57:51 UTC 2006

I would not recommend to remove the -msoft-float flag from
CPU_FLAGS. There is not floating point operations done in
the RTEMS kernel, hence you do not need to generate FPU
instructions. If you remove the -msoft-float option, newer
versions of gcc will use FPU registers for certain integer
operations (!) and the kernel will not run on processors
without an FPU. Hence, you do not gain anything by removing
-msoft-float, except the opportunity of crashing on non-FPU
LEON hardware.


John Pickwick wrote:
> Hi to all,
> What should I do to change the compilation options used during my bsp 
> buid ?
> I use the LEON2 / RTEMS 4.6.5 BSP and I'd like to replace the "CPU_FLAGS 
> = -mcpu=cypress -msoft-float" option used during the compilation to 
> suppress the soft-float setting.
> I tried to set CC_FLAGS_TARGET or CPU_FLAGS directly on my configure 
> command line but it does not work (failed with an 'invalid build alias' 
> error).
> Thanks for help,
> John.
> .

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