Re: [libopencm3-devel] Floating Point .. Linking error

[Chuck M. <chu...@gm...>]

Nope, your ARCH is wrong, use the same -mcpu and it will grab the correct
architecture.
--Chuck


On Fri, Jul 10, 2015 at 9:55 PM, Bernard Mentink <bme...@gm...> wrote:

> Hi Chuck,
>
> Thanks for the quick reply. My link flags are:
>
> LINKFLAGS = -T$(LD_SCRIPT) -nostartfiles  \
> -Wl,--gc-sections,-Map=$(BIN_DIR)/$(OUTPUT).map   \
> -mthumb -march=armv7-m -L$(QP_PORT_DIR)/$(BIN_DIR) -L$(OPENCM3_DIR)/lib
>
> I wonder if my -march is correct?
>
> Bernie
>
> On Sat, Jul 11, 2015 at 4:41 PM, Chuck McManis <chu...@gm...>
> wrote:
>
>> Well reading your error again I can see that you're error occurs when
>> linking not compiling, how do you link the final result?
>>
>>
>> On Fri, Jul 10, 2015 at 9:39 PM, Bernard Mentink <bme...@gm...>
>> wrote:
>>
>>> Hi Chuck,
>>>
>>> Yes, I only showed you the floating point related flags, my total flags
>>> are:
>>>
>>> FP_FLAGS ?= -mfloat-abi=hard -mfpu=fpv4-sp-d16
>>>
>>> CPPFLAGS = -mcpu=cortex-m4  -mthumb -Wall \
>>> -fno-rtti -fno-exceptions  \
>>> -Os $(INCLUDES) $(DEFINES) -DNDEBUG  -fno-common \
>>> -Wall -Wextra  \
>>> -Wredundant-decls  \
>>> -Wundef -Wshadow $(FP_FLAGS) -ffunction-sections -fdata-sections -MD
>>>
>>> So still not sure what gives ..
>>>
>>> Bernie
>>>
>>> On Sat, Jul 11, 2015 at 4:24 PM, Chuck McManis <chu...@gm...>
>>> wrote:
>>>
>>>> You should also define the CPU type in your c-flags (not all Cortex
>>>> CPUs *have* floating point. My flags look like this:
>>>>
>>>> $ make print-ARCH_FLAGS
>>>> ARCH_FLAGS=-mthumb -mcpu=cortex-m4 -mfloat-abi=hard -mfpu=fpv4-sp-d16
>>>> $
>>>>
>>>> And if you are wondering, I've got this in my Makefile.rules file ...
>>>>
>>>> print-%:
>>>>     @echo $*=$($*)
>>>>
>>>> Which lets you type 'make print-<target-name>' and it will print out
>>>> what that name is defined to be.
>>>>
>>>> --Chuck
>>>>
>>>>
>>>> On Fri, Jul 10, 2015 at 7:59 PM, Bernard Mentink <bme...@gm...>
>>>> wrote:
>>>>
>>>>> Hi Guys,
>>>>>
>>>>> I have the following error when trying to link my project after
>>>>> including some files using floats.
>>>>>
>>>>> arm-none-eabi/bin/ld: error: dbg/noddy.elf uses VFP register
>>>>> arguments,
>>>>> /usr/bin/../lib/gcc/arm-none-eabi/4.9.3/../../../../arm-none-eabi/lib/armv7-m/libm.a(lib_a-s_sin.o)
>>>>> does not
>>>>>
>>>>> My projects use the following FP compile flags:
>>>>> FP_FLAGS ?= -mfloat-abi=hard -mfpu=fpv4-sp-d16
>>>>>
>>>>> I am compiling for the STM32F4 target and want to use hardware float.
>>>>> It seems the tools won't allow that for some reason ..
>>>>>
>>>>> Any idea's anyone?
>>>>>
>>>>> Cheers,
>>>>> Bernie
>>>>>
>>>>> --
>>>>>
>>>>> -----------------------------------------------------------------------------------------------------------------------------------------
>>>>>
>>>>> *People born in the 50's have lived *
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>>>>>
>>>>>
>>>>
>>>
>>>
>>> --
>>>
>>> -----------------------------------------------------------------------------------------------------------------------------------------
>>>
>>> *People born in the 50's have lived *
>>> *in seven decades.*
>>> *two centuries,*
>>> *and two millenniums.*
>>> *We had the best music, fastest cars, drive-in theaters, soda fountains,
>>> and happy days.*
>>> *And we are not even that old yet.*
>>> *We're just that cool.*
>>>
>>> ----------------------------------------------------------------------------------------------------------------------------------------
>>>
>>
>>
>
>
> --
>
> -----------------------------------------------------------------------------------------------------------------------------------------
>
> *People born in the 50's have lived *
> *in seven decades.*
> *two centuries,*
> *and two millenniums.*
> *We had the best music, fastest cars, drive-in theaters, soda fountains,
> and happy days.*
> *And we are not even that old yet.*
> *We're just that cool.*
>
> ----------------------------------------------------------------------------------------------------------------------------------------
>