Rodolphe,
I made a simple program in C++ and found out that there was a similar
problem: multiplying two float numbers results always in 0.00
We compiled on the board itself and the little C++ program worked.
This made us looking a bit further: we found out that there were
incompatibilities in between the cross compiler of CodeBench Lite and the
C++ libraries/compilers installed on our Linaro distro running on our ARM
CortexA9.
After installing the necessary Linaro cross-compilers:
- sudo apt-get install gcc-arm-linux-gnueabihf
- sudo apt-get install g++-arm-linux-gnueabihf
- sudo apt-get install gdb-arm-linux-gnueabihf
and specifying -mfpu=vfp3 -mfloat-abi=hard as compiler flags. We saw that
our C++ application is working well.
Now for V8, we made a script:
#!/bin/sh
CROSS_BASE=/usr
PREFIX_BIN=$CROSS_BASE/bin/arm-linux-gnueabihf
export TOOL_PREFIX=$PREFIX_BIN
export CXX=$TOOL_PREFIX-g++
export LINK=$TOOL_PREFIX-g++
export AR=$TOOL_PREFIX-ar
export RANLIB=$TOOL_PREFIX-ranlib
export CC=$TOOL_PREFIX-gcc
export LD=$TOOL_PREFIX-g++
export CCFLAGS="-mfloat-abi=hard -mfpu=vfpv3"
export ARM_TARGET_LIB=${CROSS_BASE}/arm-linux-gnueabihf/lib
We run the script and then: make arm.release -j4
OUTPUT_DIR=/your/local/output-dir
After deployment and running shell: print(3.3*2.1) works perfectly !
So, case closed. Sorry about the mistake and a huge thanks for your help !
Op vrijdag 5 juli 2013 20:41:01 UTC+2 schreef Rodolph Perfetta het volgende:
> In V8 you can have armfpu set (vfp or neon) and armfloatabi set (softfp or
> hard), I'll be curious to know where you read it was not possible.
>
> Did you manage to write an equivalent piece of C code? That would settle
> the flaot-abi issue.
>
>
> On 5 July 2013 16:07, Benedikt Naessens <[email protected]
> <javascript:>>wrote:
>
>> The armfpu option is a V8 make option (sorry, I didn't include the whole
>> make instruction, because I feared that it causes my posts to get
>> automatically deleted).
>>
>> print(2.2*1.1) in the V8 shell gives correct results (and of course,
>> doesn't crash). printf(2.1*2) results in an error (crash)
>>
>> When I ask for the gcc version of the codebench, then I get: gcc version
>> 4.7.2 (S0urcery C0deBench Lite 2012.09-104)
>> Unfortunately, the output of the make is usually:
>> CCX(host) ....
>>
>> So, hard to guess which one is used during building. Anyway, after
>> running the 'file' command on the produced files I get ARM files, I get:
>> "ELF 32-bit LSB executable, ARM, version 1 (SYSV), dynamically linked
>> (uses shared libs), for GNU/Linux 2.6.16, not stripped"
>> Thus, I assume it uses the cross)compiler
>>
>> At some point during the building, it shows some warnings though:
>> "../src/profile-generator.h:73:15: note: the mangling of 'va_list' has
>> changed in GCC 4.4"
>>
>> I am not so sure about this message, but according to me, it doesn't mean
>> it is using GCC 4.4, but just refers to the fact that the va_list has
>> changed from GCC 4.4 on (since we are using 4.7.2)
>>
>>
>>
>> Op vrijdag 5 juli 2013 15:34:12 UTC+2 schreef Rodolph Perfetta het
>> volgende:
>>
>>> When you say "I read that if you speciify armfpu option, you need to
>>> use s0ftfp instead of hard", you mean gcc option or V8 make options?
>>>
>>> Also you mentioned print(2.2*1.1) works, does this mean it prints the
>>> right result or just that it doesn't crash? Have you tried writing a small
>>> C program doing the same with printf?
>>>
>>> Finally could you give your compiler version.
>>>
>>>
>>>
>>> On 5 July 2013 13:40, Benedikt Naessens <[email protected]> wrote:
>>>
>>>> Two of my posts get deleted, I don't know which word is causing the
>>>>> problem, so I will use some symbols to avoid that my posts get
>>>>> automatically deleted.
>>>>>
>>>>
>>>> According to the Cod3S0rc3ry website, the L1t3 version doesn't have the
>>>> necessary sources to use the armfl0atabi=hard option. Anyway, I read that
>>>> if you speciify armfpu option, you need to use s0ftfp instead of hard.
>>>> Unfortunately, it still is crashing.
>>>>
>>>> Hope no offensive word is causing the deletion of this post :)
>>>>
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