add Intel compiler run to travis

[slayoo]

add Intel compiler run to travis

[tvatter]

Naïve question: is there a specific reason for prioritizing the Intel compiler?

I would have thought that CLANG was more common, but I'm still new to C++...

[slayoo]

prioritising - definitely not, but why not to test it
we compile with clang on OSX

[tvatter]

Yeah, I was thinking about clang on ubuntu, but intel is worth trying too.

[tvatter]

Alright, so I tried adding clang and icc, and I have the same (weird) problem related to the installation of the gsl R package:

https://travis-ci.org/vinecopulib/vinecopulib/jobs/231656854
https://travis-ci.org/vinecopulib/vinecopulib/jobs/231656857

[slayoo]

tried with using icc only for vinecopulib (and not the dependencies):
https://travis-ci.org/vinecopulib/vinecopulib/builds/232342874

Seems to run OK, but the compilation fails due to missing std::isnan

[tvatter]

Yes, I know, for both clang and icc, the problem is due to the install of the R package gsl.

Concerning isnan, it seems that it's a known issue: https://software.intel.com/en-us/node/633279

[tvatter]

The isnan issue is corrected in https://github.com/vinecopulib/vinecopulib/tree/intel-compiler and the library and examples compile.

However, there is a weird segfault happening now :/ By weird, I mean that you need to look at test_all.cpp to see where the segfault happens.

[slayoo]

ran it through a debugger, but the stack trace doesn't reveal much (don't know how to force icc to emit debug symbols into the binary - -g seems not to work):

[slayoo]

https://travis-ci.org/vinecopulib/vinecopulib/builds/232811099