InitHeaderSearch.cpp

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//===--- InitHeaderSearch.cpp - Initialize header search paths ------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// This file implements the InitHeaderSearch class.
//
//===----------------------------------------------------------------------===//
 
#include "clang/Basic/FileManager.h"
#include "clang/Basic/LangOptions.h"
#include "clang/Config/config.h" // C_INCLUDE_DIRS
#include "clang/Lex/HeaderMap.h"
#include "clang/Lex/HeaderSearch.h"
#include "clang/Lex/HeaderSearchOptions.h"
#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/ADT/Twine.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/TargetParser/Triple.h"
#include <optional>
 
using namespace clang;
using namespace clang::frontend;
 
namespace {
/// Holds information about a single DirectoryLookup object.
struct DirectoryLookupInfo {
  IncludeDirGroup Group;
  DirectoryLookup Lookup;
  std::optional<unsigned> UserEntryIdx;
 
  DirectoryLookupInfo(IncludeDirGroup Group, DirectoryLookup Lookup,