Re: [ECOS] GCC toolchain with HW floating-point enabled

[Davide Pippa <thepyper@gmail.com>]

I had passed the flags "-mcpu=cortex-m4 -mthumb -mfloat-abi=hard
-mfpu=vfpv4-d16" to both compiler and linker (which both are
arm-eabi-g++"), but problem was still there.

I got things compiled this way:
I had to copy all the libraries located in:
gnutools/arm-eabi/lib/gcc/arm-eabi/4.6.3/thumb/thumb2/fpu/fpv4spd16
into the directory:
gnutools/arm-eabi/lib/gcc/arm-eabi/4.6.3/
where the libraries that are linked by gcc are located.

I don't know exactly if it is the same issue, but googling I found
that there is some issue with gcc linker in the selection of the
libraries, suggesting various workarounds...






2013/6/4 Ilija Kocho <ilijak@siva.com.mk>:
> On 04.06.2013 12:41, Davide Pippa wrote:
>> Hi!
>
> [SNIP]
>
>
>> arm-eabi-g++ -I"H:/Works/Arm/PyIde/roms/04001_TWR-K70F120M/include"
>> -O0 -Wall -Wa,-adhlns="main.o.lst" -fno-exceptions -fno-rtti -c
>> -fmessage-length=0 -MMD -MP -MF"main.d" -MT"main.d" -mcpu=cortex-m4
>> -mthumb -mfloat-abi=hard -mfpu=vfpv4-d16 -g3 -gdwarf-2 -o "main.o"
>> "../main.cpp"
>>
>> I've seen there is many libgcc versions in the toolchain directory
>> (gnuttols/arm-eabi/lib/gcc/), which should I pick?
>> Is there some compiler flags to indicate which version to pick, or
>> should I just copy files over the version that currently is being
>> linked?
>>
>
> GCC will select correct libraries on a base of floating point flags.
> Therefore you need to provide same floating point flags for compilation
> and linking.
>
> HTH
>
> Ilija
>

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