Thomas Fitzsimmons wrote:
> Actually, EMACS_HEAP_EXEC is true!

OK, thanks, that explains things. I installed the first attached patch to the 
emacs-26 branch as a quick hack to work around the problem, and the second 
attached patch to the master branch to come up with a better way to address the 
underlying issue that doesn't involve fiddling with environment variables. 
Please let us know if this doesn't work for your platform, as I've tested this 
only on x86-64.