llvm-project/llvm/test/CFrontend/2005-12-04-AttributeUsed.c

// RUN: %llvmgcc %s -S -emit-llvm -o - | llvm-as | llvm-dis | \
// RUN:   grep llvm.used | grep foo | grep X

int X __attribute__((used));
int Y;

__attribute__((used)) void foo() {}