Passing RTS options to GHC via `ghc-options` in `stack.yaml` fails

[TOTBWF]

When trying to pass in RTS options to GHC via ghc-options in stack.yaml, the RTS options aren't properly threaded through.

Steps to reproduce

1. Create a new project via stack new
2. Add the following to stack.yaml

ghc-options:
  "$locals": +RTS -s -RTS

3. Run command stack build.

Expected

The RTS options are passed to GHC, and the statistics are printed out while compiling.

Actual

Cabal-simple_mPHDZzAJ_2.4.0.1_ghc-8.6.5: unknown RTS option: --ghc-options

Stack version

$ stack --version
Version 2.1.3 x86_64

Method of installation

• Official binary, downloaded from stackage.org or fpcomplete's package repository

[EpicOrange]

It looks like it turns +RTS -s -RTS into --ghc-options +RTS --ghc-options -s --ghc-options -RTS. Quoting the options ("+RTS -s -RTS") doesn't change it.

While we're at it -- leaving options empty is an error, which doesn't seem right either.

ghc-options:
  "$locals": # +RTS -s -RTS

Aeson exception:
Error in $['ghc-options']['$targets']: failed to parse field 'ghc-options': expected GhcOptions, encountered Null
See http://docs.haskellstack.org/en/stable/yaml_configuration/

[jwaldmann]

Hi. This does work for stack install, but it breaks stack repl? [EDIT: ah noh it's fine, I need to add -RTS]

I am using stack @ 9fcf300 to build my project, where I have this in stack.yaml:

ghc-options:
  "$everything" : -O2 -j4 +RTS -A400m

and this in my cabal file:

executable pure-matchbox
  main-is:             pure-matchbox.hs
  ghc-options:         -threaded -rtsopts -fno-omit-yields  -fdicts-strict

when I do stack repl src/Some/Thing.hs (with ghc-8.10.5), I get

...
pure-matchbox> initial-build-steps (lib)
The following GHC options are incompatible with GHCi and have not been passed to it: -threaded -O2
Configuring GHCi with the following packages: pure-matchbox
ghc: Unknown output flag -op
ghc: Internal error in the RTS options parser

I can make an extra issue if you want.

Actual source code: https://gitlab.imn.htwk-leipzig.de/waldmann/pure-matchbox/-/tree/epsilon