Looking over the apple code path for Host::GetArchitecture, I'm a little confused about why all this custom logic is needed. What are the situations in which llvm::sys::getDefaultTargetTriple() will return something other than what we want? Specifically, a concrete example might help illustrate the problem.
I understand from the comment that it has something to do with being able to run 32 and 64-bit executables in the same operating system. Isn't this the case everywhere? I can run 32-bit executables on Windows x64 as well. llvm::Triple has a function called get32BitArchVariant() that I thought returns a 32-bit triple for this case. Does this not work for some Apple configuration? It seems like this logic should be able to be sunk into llvm::Triple somehow. Conceptually speaking, it seems like there should be two cases: 64-bit: host_arch_64 = llvm::Triple::getDefaultTargetTriple() host_arch_32 = llvm::Triple::getDefaultTargetTriple().get32BitArchVariant() 32-bit host_arch_64 = <empty> host_arch_32 = llvm::Triple::getDefaultTargetTriple() Why doesn't this work?
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