Executing search does not add to jump list

If I define:

nmap = /===<cr>

after pressing = to jump to the next occurrence of === I may use <C-o> to jump
back. Great. But if I define:

nmap = :<c-u>exe '/==='<cr>

then searches for some reason are not added to the jump list. Can you confirm
this behaviour? Is there a way to remember jumps in the latter case?

This is a contrived example, but I have encountered this problem when trying to
define a mapping in a plugin, which builds the regex out of a variable (so I
need to use :exe).

Using Vim 7.4.1707.

Nicola


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