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Compiler projects using llvm 
// RUN: %clang -### %s -fno-optimize-sibling-calls 2> %t
// RUN: FileCheck --check-prefix=CHECK-NOSC < %t %s
// CHECK-NOSC: "-fno-optimize-sibling-calls"

// RUN: %clang -### -foptimize-sibling-calls %s 2> %t
// RUN: FileCheck --check-prefix=CHECK-OSC < %t %s
// CHECK-OSC-NOT: "-fno-optimize-sibling-calls"