On Thu, Apr 30, 2020 at 04:21:47PM +0200, Merijn Verstraaten wrote:

> 1) Aware that multiple invocations of -with-rtsopts clobber each other, and
> 2) Actually relies on this behaviour?

Haven't thought about it, but this may makes sense, when configuring
options in more than one file, e.g. foo.cabal, and stack.yaml, and
whichever precedence, should probably be definitive.  Likely cumulative
behaviour would be more surprising.

[ Based on the assumption that GHC options in stack.yaml are in addition
  to the component-specific options in the cabal file. ]

The name is plural, so takes all the options at once.  There could be
new options to incrementally modify the list of rtsopts:

    -set-rtsopt?
    -add-rtsopt?
    -del-rtsopt?

assuming there's a sensible way to accumulate these.

--
    Viktor.
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