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Dear Respectful frasercrmck,
Thanks for your contributing a good example of making own LLVM backend.
While I am building your project with gcc-8 or later, I found a small compile error.
The detail that I faced is the same as following.
microsoft/DirectXShaderCompiler#1692
It was about not being able to convert unique_ptr to bool type implicitly.
So it was needed to be modified to convert explicitly, which was I did.
As is
bool hasMD() const { return MDMap; }
To be
bool hasMD() const { return static_cast(MDMap); }
(Actually, I have not yet verified if certain side effects exist when using gcc 4.9.)
Best Regards, ^^