[clang] [Clang] Fix __cpuidex conflict with CUDA (PR #152556)

[Aiden Grossman via cfe-commits]

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@@ -345,10 +345,15 @@ static __inline int __get_cpuid_count (unsigned int __leaf,
 // In some configurations, __cpuidex is defined as a builtin (primarily
 // -fms-extensions) which will conflict with the __cpuidex definition below.
 #if !(__has_builtin(__cpuidex))
+// In some cases, offloading will set the host as the aux triple and define the
+// builtin. Given __has_builtin does not detect builtins on aux triples, we need
+// to explicitly check for some offloading cases.
+#ifndef __NVPTX__
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boomanaiden154 wrote:

Good point. I've filed https://github.com/llvm/llvm-project/issues/152558 to track this.

https://github.com/llvm/llvm-project/pull/152556