Compiling without -O

Simon Peyton Jones simonpj at
Thu Oct 29 11:10:33 UTC 2015

I want to validate, but to compile my stage-1 compiler with -O0.  How do I do that?
I used to add
GhcStage1HcOpts += -DDEBUG -O0
to mk/, but that doesn't seem to work any more.
What now?
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