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in clang brought in with the llvm 22 update: commit 5d0e26e571c08dc4c0b2a25ed6c9f845f054fa76 Author: Koakuma <koachan@protonmail.com> Date: Tue Apr 29 07:36:32 2025 +0700 [compiler-rt] Make sure __clzdi2 doesn't call itself recursively on sparc64 (#136737) On 64-bit platforms, libgcc doesn't ship with __clzsi2, so __builtin_clz gets lowered to __clzdi2. A check already exists for GCC, but as of commit 8210ca019839fc5430b3a95d7caf5c829df3232a clang also lowers __builtin_clz to __clzdi2 on sparc64. Update the check so that building __clzdi2 with clang/sparc64 also works. ok tb@, deraadt@