llvm dev - Mar 2013 - [LLVMdev] Running cross compiled binaries for ARM on gem5

Thanks Renato and Giang.

I was able to run a simple HelloWorld program on gem5 (in SE mode) by using 
-target -arm-none-linux-gnueabi as the option during cross compilation.

I am trying to cross compile some Computer Vision algorithms, which use
OpenCV libraries, and I tried using the same command line options - 

clang++ *-emit-llvm -static -c -Wall -g  -O0 -mfpu=vfp -mfloat-abi=soft
-march=armv7-a -target arm-none-linux-gnueabi* -DCLOCK_GETTIME_TIMING
-DOPENCV_2_4 
-c ../MEVBench/Benchmarks/FeatureExtraction/FeatureExtraction.cpp 
-I/home/silky/VecProject/opencv/OpenCVInstall/arm/include 
-I/home/silky/CodeSourcery/Sourcery_CodeBench_Lite_for_ARM_GNU_Linux/arm-none-linux-gnueabi/include/c++/4.7.2/
-I
/home/silky/CodeSourcery/Sourcery_CodeBench_Lite_for_ARM_GNU_Linux/arm-none-linux-gnueabi/include/c++/4.7.2/arm-none-linux-gnueabi/armv4t/
-o FE.bc

However, this errors out saying 

/home/silky/VecProject/opencv/OpenCVInstall/arm/include/opencv2/core/mat.hpp:117:9:
error: cannot compile this atomic library call yet
        CV_XADD(refcount, 1);
        ^~~~~~~~~~~~~~~~~~~~
/home/silky/VecProject/opencv/OpenCVInstall/arm/include/opencv2/core/operations.hpp:61:38:
note: expanded from macro 'CV_XADD'
        #define CV_XADD(addr, delta)
__c11_atomic_fetch_add((_Atomic(int)*)(addr), (delta), __ATOMIC_SEQ_CST)

Could someone please suggest what I am missing here, or what the error
indicates?

Thank you all.




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On 17 March 2013 22:40, SArora <silkyar at umich.edu> wrote:
> However, this errors out saying
>
>
>
/home/silky/VecProject/opencv/OpenCVInstall/arm/include/opencv2/core/mat.hpp:117:9:
> error: cannot compile this atomic library call yet
>         CV_XADD(refcount, 1);
>         ^~~~~~~~~~~~~~~~~~~~
>
>
/home/silky/VecProject/opencv/OpenCVInstall/arm/include/opencv2/core/operations.hpp:61:38:
> note: expanded from macro 'CV_XADD'
>         #define CV_XADD(addr, delta)
> __c11_atomic_fetch_add((_Atomic(int)*)(addr), (delta), __ATOMIC_SEQ_CST)
>
This is odd. This atomic is implemented in CGAtomic.cpp, but it's being
lowered as a library call because "UseLibcall" is true:

bool UseLibcall = (Size != Align ||
                     getContext().toBits(sizeChars) > MaxInlineWidthInBits);

I don't think it should in your case. That looks like a bug, but I'm not
an
atomic library expert. Can you create a bug in bugzilla (
http://www.llvm.org/bugs/), please?

Possibly, you should send an email with this error and the bugzilla ID to
the list, just to make sure you get the attention of the right people.

cheers,
--renato
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On 03/18/2013 10:28 AM, Renato Golin wrote:
> On 17 March 2013 22:40, SArora <silkyar at umich.edu 
> <mailto:silkyar at umich.edu>> wrote:
>
>     However, this errors out saying
>
>    
/home/silky/VecProject/opencv/OpenCVInstall/arm/include/opencv2/core/mat.hpp:117:9:
>     error: cannot compile this atomic library call yet
>             CV_XADD(refcount, 1);
>             ^~~~~~~~~~~~~~~~~~~~
>    
/home/silky/VecProject/opencv/OpenCVInstall/arm/include/opencv2/core/operations.hpp:61:38:
>     note: expanded from macro 'CV_XADD'
>             #define CV_XADD(addr, delta)
>     __c11_atomic_fetch_add((_Atomic(int)*)(addr), (delta),
>     __ATOMIC_SEQ_CST)
>
>
> This is odd. This atomic is implemented in CGAtomic.cpp, but it's 
> being lowered as a library call because "UseLibcall" is true:
>
> bool UseLibcall = (Size != Align ||
>                      getContext().toBits(sizeChars) > 
> MaxInlineWidthInBits);
>
> I don't think it should in your case. That looks like a bug, but
I'm
> not an atomic library expert. Can you create a bug in bugzilla 
> (http://www.llvm.org/bugs/), please?
>
> Possibly, you should send an email with this error and the bugzilla ID 
> to the list, just to make sure you get the attention of the right people.
>
> cheers,
> --renato
>
Hello,
This is the same issue reported here 
http://llvm.org/bugs/show_bug.cgi?id=15429
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