Vc Build Error

[Matthias Kretz]

On Monday, January 25, 2016 05:53:39 PM GRABNER Friedrich wrote:
> Firstly I can easily build both the 0.7 and 0.8 branches however for the
> master branch I see the following error:
> 
> Assembler messages:
> /tmp/ccGuLgWH.s:12: Error: no such instruction [...]
> make[2]: *** [CMakeFiles/Vc.dir/avx_sorthelper_AVX2+FMA+BMI2.cpp.o]

This tells us that the assembler does not understand said instructions. I.e. 
your binutils package is too old. Please let me know the output of 'as --
version' so that I can add a check to the cmake files to warn others of this 
issue.

You'll need to either
1. update your binutils package
2. or disable the AVX2 code in libVc (try -DVc_AVX2_INTRINSICS_BROKEN=TRUE 
when you call cmake)
3. or you could try to use clang 3.7, which ships its own integrated 
assembler.

> Despite using the same cmake settings. Ok I don't mind using version 0.8
> however I cannot get it to compile...

There's no Vc 0.8 release. The branch was always experimental and is 
discontinued.

> Using gcc-5.2, I am trying to compile the example matrix (though the
> same/similar errors occur for all examples) as I have seen from
> investigating the archives the reccomended compilation settings are
> something like this:

Is this for 0.8 then?
> 
> g++ -std=c++11 -march=native -O3 -I/path/to/include -L/path/to/lib -lVc
> main.cpp
> 
> The error I receive is as follows:
> 
> main.cpp:(.text+0x202): undefined reference to `Vc::RandomState'
> [...]

try putting -lVc after main.cpp.

I recommend you try to get Vc 1.1 working. 0.7 is quite old and there's no 
support for newer compilers and instructions.

Cheers,
  Matthias

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