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1; RUN: not --crash llc %s -mtriple aarch64-apple-darwin -debug-only=aarch64-call-lowering -global-isel -global-isel-abort=2 -o - 2>&1 | FileCheck %s2; REQUIRES: asserts3 4; Verify that we fall back to SelectionDAG, and error out when we can't tail call musttail functions5; CHECK: ... Cannot tail call externally-defined function with weak linkage for this OS.6; CHECK-NEXT: Failed to lower musttail call as tail call7; CHECK-NEXT: warning: Instruction selection used fallback path for caller_weak8; CHECK-NEXT: LLVM ERROR: failed to perform tail call elimination on a call site marked musttail9declare extern_weak void @callee_weak()10define void @caller_weak() {11 musttail call void @callee_weak()12 ret void13}14