Option /MP is ignored by C++ 13.1

Option /MP is ignored by C++ 13.1

I have been using C++ XE 13. 0 for a while.  I liked very much multi-processor compilation capabilities. Compiler was using all 8 cores and it was very fast.

However latest update to compiler (Update 5) ignores /MP completely. Now compiler is using only one core during compilation and it takes forever to build the same project with the same settings. 

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For more complete information about compiler optimizations, see our Optimization Notice.

I have already reported this issue to https://premier.intel.com/ and the issue is confirmed and under investigation.

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