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I don't really know exactly why you're getting this, but it seems like you forgot the last line in your Builtins<Target>.def. Namely, the line: #undef BUILTIN On Thu, May 26, 2016 at 1:29 AM, Rail Shafigulin via llvm-dev < llvm-dev at lists.llvm.org> wrote: > I've introduced intrinsics for my target however when I compile llvm+clang > I get a a redefinition warning:

I've introduced intrinsics for my target however when I compile llvm+clang I get a a redefinition warning: llvm/tools/clang/lib/Basic/Targets.cpp:904:0: warning: "BUILTIN" redefined [enabled by default] #define BUILTIN(ID, TYPE, ATTRS) { #ID, TYPE, ATTRS, 0, ALL_LANGUAGES }, ^ In file included from llvm/tools/clang/lib/Basic/Targets.cpp:26:0: