Use gfortran interface of MKL.

[ViralBShah]

Attempting to implement the discussion in #5303

[ViralBShah]

I have been able to link all the libraries against MKL's gfortran interface, but can't get the system image to build:

julia 01:07:38 (vs/mkl) ~/julia-mkl$ make
    PERL base/build_h.jl.phony
fatal: error thrown and no exception handler available.
ErrorException("error compiling _start: error compiling check_blas: error compiling blas_vendor: could not load module libmkl_gf_ilp64: libmkl_gf_ilp64: cannot open shared object file: No such file or directory")
*** This error is usually fixed by running 'make clean'. If the error persists, try 'make cleanall'. ***
make[1]: *** [/home/viral/julia-mkl/usr/lib/julia/sys.bc] Error 1
make: *** [release] Error 2

[ViralBShah]

@vtjnash Could this be due to the new fast startup stuff, where it may be unable to find the MKL libraries?

[ViralBShah]

Cc: @andreasnoackjensen

[andreasnoack]

I get the same error. The weird thing is that if I choose another .so, e.g. mkl_core.so, then julia can find the file. I have also tried to copy the the relevant library files to /julia/usr/lib and that works.

[lindahua]

A little bit off topic. Is it possible to set up a travis session to test Julia + MKL (with a proper license of course)?

[vtjnash]

It sounds like the dynamic linker is unable to find some dependency of libmkl_gf_ilp64

[ViralBShah]

Maybe we just copy the files when using mkl?

[ViralBShah]

All dependencies of libmkl_gf_ilp64 are in the RPATH and LD_LIBRARY_PATH. I think it is best to just copy all the MKL files into usr/lib, if that works.

@lindahua We can certainly install MKL on a travis box. Perhaps best to have a separate issue for that.

[vtjnash]

I'm not sure what rules linux uses for looking up dependencies of dependencies, however, setting LD_LIBRARY_PATH at runtime should have been enough.

[staticfloat]

strace is your friend here. Run the failing command inside of strace, filtering out all syscalls except for open. The command for that is:

$ strace -fe open ./julia

If you're running on OSX, dtruss can be used to do the same thing, but it's usually better to catch stat64 on OSX:

$ dtruss -f -t stat64 julia