[llvm-3.8] Support GHCi and TH #200
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Enables llvm-general to be used out-of-the-box with GHCi and TemplateHaskell. Note that the LLVM shared library is only required if you use GHCi/TH; regular compiles work as usual. Since cabal dependencies can not specify flags, this also makes llvm-general easier to work with as a dependency.
extraGHCiLibs was introduced in Cabal-1.22. Before GHC-8.0 there is no direct way to test which wersion of the Cabal library we are compiling against, but we can work around this limitation with a little bit of TH trickery.
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See comments in #199.