llvm/compiler-rt/lib/profile/InstrProfilingRuntime.cpp

//===- InstrProfilingRuntime.cpp - PGO runtime initialization -------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

extern "C" {

#include "InstrProfiling.h"

static int RegisterRuntime() { … }

/* int __llvm_profile_runtime  */
COMPILER_RT_VISIBILITY int INSTR_PROF_PROFILE_RUNTIME_VAR = …;
}