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Eric Conlon authored
Fixes https://github.com/haskell/cabal/issues/6421 To summarize, Cabal passes all C and C++ flags through GHC to the underlying C or C++ compiler using -optc. This works for GHC < 8.10, but now GHC expects C++ flags to come through -optcxx. This means that anything through -optc is ignored, so we cannot pass any flags to the C++ compiler. This change simply detects the GHC version and uses the correct arguments. This PR has been tested manually and two PackageTests have been added to cabal-testsuite. They pass under GHC 8.8.4 and GHC 8.10.2.
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