what is the purpose of sointel64 in Custom Shared Object Builder

Hi:

I follow the most simple example in mkl/tools/builder, just make intel64, and the nm mkl_custom.so, I can see symbol dgemm in it. On contrast, if I use make sointel64, I also get mkl_custom.so. However, if I use nm mkl_custom.so, there is no symbol dgemm at all. In the first case, I directly link my dgemm program to mkl_custom.so and everything is fine. I the second case, ld said there is no symbol of dgemm.

I want to ask what is the purpose of sointel64 in Custom Shared Object Builder or how to use it correctly?

I use ubuntu16.04 64bits.