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Motivation: I (simonmar) want to use hsc2hs with C++, which requires ``` hsc2hs-options: --cc=g++ --lflag=-lstdc++ ``` We pass `hsc2hs-options` before or after `--cc` and `-lflag`, depending on the version of `hsc2hs`. I (phadej) added a tests: - hsc2hs-options are passed to `hsc2hs` (but not to GHC e.g.). - `--cc` has expected effect `g++` tests doesn't seem to work on Windows, due mingw ncurses linkage issue, https://github.com/msys2/MINGW-packages/issues/3531 We also need non-ancient hsc2hs (>= 0.68).
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