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...FILE > struct definition. The only difference between these two IR structs is that > a function pointer type field in the first form is replaced by {}* in the > second form. Could anyone tell me why this happens and how to disable the > {}* replacement? > > > See CodeGenTypes::isFuncTypeArgumentConvertible in clang/lib/CodeGen/CodeGenTypes.cpp; this behavior exists to protect the type conversion code from infinite recursion. Our behavior could probably be improved here; patches welcome (but be warned the code is rather complicated). Off the top of my head, I can't say why this is triggering...

Dear LLVM developers, My name is Ben Niu and I am a Ph.D. student at Lehigh University. I compiled the MUSL C library using Clang 3.3, and dumped the generated LLVM IR files. I found that the MUSL-defined FILE struct (aliasing __FILE_s) struct __FILE_s { unsigned flags; unsigned char *rpos, *rend; int (*close)(FILE *); unsigned char *wend, *wpos; unsigned char *mustbezero_1;