llvm-project/clang/test/CodeGenCXX/attr-used-member-function-implicit-instantiation.cpp

// RUN: %clang_cc1 -triple x86_64-unknown-unknown -emit-llvm -o - %s | FileCheck %s

// Check that PR17480 is fixed: __attribute__((used)) ignored in templated
// classes
namespace InstantiateUsedMemberDefinition {
template <typename T>
struct S {
  int __attribute__((used)) f() {
    return 0;
  }
};

void test() {
  // Check that InstantiateUsedMemberDefinition::S<int>::f() is defined
  // as a result of the S class template implicit instantiation
  // CHECK: define linkonce_odr i32 @_ZN31InstantiateUsedMemberDefinition1SIiE1fEv
  S<int> inst;
}
} // namespace InstantiateUsedMemberDefinition