[IPOL discuss] Eigen, once again...

[Pierre Moulon]

Hi,

Which version of Eigen have you considered, 3.04 ?

Which part have you tried to compile?
 I want say:
 - using Eigen as a header only library,
 - compile all Eigen library modules (as a standalone)

I think all the libraries are subject to give warning or error message
under a given compiler.

Regards,
Pierre

2011/12/16 Nicolas Limare <nicolas.limare at cmla.ens-cachan.fr>

> Hi,
>
> Once again, I come back about the Eigen library. Sorry, it must look
> like stubbornness...
>
> I happen to have seen a comment in an IPOL review. I do not disclose
> any detail about the IPOL article involved, so I think there is no
> editorial problem with my message.
>
> The review comment is:
>
> > First, the Eigen library [...] does not compile with gcc 4.3.3 on
> > Ubuntu 64 bits. (at least I did not succeed in compiling your
> > code with this system, the compilation stops on the files from
> > Eigen).
> > No problem with gcc 4.4.1 on Ubuntu 64 bits and with gcc 4.4.3 on
> > Ubuntu 32 bits. I guess that the problem is with gcc 4.3. It seems
> > that this bug is not documented on the Eigen page. Now, the code of
> > this library is a bit cryptic to me, so I may miss something.
>
> The Eigen version involved is Eigen 3.0. I do not now which compiler
> options were used, but I think the reviewer would have pointed them it
> they were the source of the problem.
>
> I tested with gcc v4.4.5, it works. I also tested with the Intel icc
> v12.0.4 compiler, and it threw lots of warning messages on Eigen, but
> could compile. I tested with Sun suncc v12.2 compiler and it aborted
> on Eigen because of too many error messages. I tested with the LLVM
> clang v1.1 compiler and it died on Eigen.
>
> The Eigen web site says "Eigen has good compiler support as we run our
> test suite against many compilers to guarantee reliability and work
> around any compiler bugs. Eigen also is standard C++98 and maintains
> very reasonable compilation times."
>
> From these quick tests, I doubt the validity of this assertion, at
> least for the 3.0 version. It reinforces my feeling that Eigen is not
> suitable for IPOL.
>
> --
> Nicolas LIMARE - CMLA - ENS Cachan
> http://www.cmla.ens-cachan.fr/~limare/
> IPOL - image processing on line
> http://www.ipol.im/
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