Math lib inclusion in BSP

[Daniel Gutson]

El 25/9/2015 13:17, "sudarshan.rajagopalan" <sudarshan.rajagopalan at vecna.com>
escribió:
>
> On 2015-09-25 11:06, Daniel Gutson wrote:
>>
>> On Thu, Sep 24, 2015 at 4:49 PM, sudarshan.rajagopalan
>> <sudarshan.rajagopalan at vecna.com> wrote:
>>>
>>> Hey all,
>>>
>>> We are developing a new BSP that uses math.h in few of the BSP files. I
do
>>
>>
>> May I ask why do you need floating point operations in a kernel? At
>> least, what sort of operations and why not move them upwards.
>
>
> We are doing floating point operations in one of the device drivers as
part of the BSP - to perform buadrate calculation, to be specific, which
involes inverse operations and using roundf().

How will you handle fp exceptions?
Did you consider using fixed point?
>
>
>>
>>> understand that the math library functions are not part of standard C
>>> library and has to be linked using "-lm". So I include "LD_LIBS  +=
-lm" in
>>> the custom .cgf config file but this doesn't seem to work. I think this
has
>>> to be linked in a proper order. Could someone help with this?
>>>
>>> Heres the custom config file:
>>>
>>> include $(RTEMS_ROOT)/make/custom/default.cfg
>>>
>>> RTEMS_CPU = arm
>>>
>>> LD_LIBS += -lm
>>>
>>> CPU_CFLAGS = -march=armv7-m -mthumb
>>>
>>> CFLAGS_OPTIMIZE_V = -O0 -g -mfloat-abi=hard -mfpu=fpv4-sp-d16
>>>
>>> Thanks and Regards,
>>> Sudarshan
>>> _______________________________________________
>>> devel mailing list
>>> devel at rtems.org
>>> http://lists.rtems.org/mailman/listinfo/devel
>
>
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