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Create a TranslationUnit by loading ast file (aka precompiled header). #422

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The first of a series of PRs related to #416

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Dies on windows. Suggestions welcome!

open(header, "w") do io
write(io, "void foo();")
end
run(`$(clang()) -x c $header -emit-ast -o $pch`);
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To use Clang on Windows, we need some setups to let Clang know where to find those system headers and that's a bit tricky to get it right. If the precompiled header is not very large, we can use pre-generatad the pch files.

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