[Rd] Lack of -O2 (or -O) gcc compiler flag causes package installation failure

[alexholehouse]

Simon Urbanek wrote
> 
> Is this your real Makevars? That would override all R settings and break a
> lot of things ... You should not set anything other than PKG_xx flags in
> Makevars since the "regular" flags are taken from R. Providing the source
> of package.tar.gz would give us more insight on what you're actually doing
> - I suspect that the problem is in you breaking the build system and not
> in the optimization flags ...
> 

Literally 100 points for you. I'd thought the various flags were there to be
overriden - hadn't appreciated they were not the ones I was meant to be
changing. Hugely appreciated.

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