1//===- llvm/Support/Unix/Host.inc -------------------------------*- C++ -*-===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// This file implements the UNIX Host support.
11//
12//===----------------------------------------------------------------------===//
13
14//===----------------------------------------------------------------------===//
15//=== WARNING: Implementation here must contain only generic UNIX code that
16//===          is guaranteed to work on *all* UNIX variants.
17//===----------------------------------------------------------------------===//
18
19#include "Unix.h"
20#include "llvm/ADT/StringRef.h"
21#include "llvm/Config/config.h"
22#include <cctype>
23#include <string>
24#include <sys/utsname.h>
25
26using namespace llvm;
27
28static std::string getOSVersion() {
29  struct utsname info;
30
31  if (uname(&info))
32    return "";
33
34  return info.release;
35}
36
37std::string sys::getDefaultTargetTriple() {
38  StringRef TargetTripleString(LLVM_DEFAULT_TARGET_TRIPLE);
39  std::pair<StringRef, StringRef> ArchSplit = TargetTripleString.split('-');
40
41  // Normalize the arch, since the target triple may not actually match the
42  // target.
43  std::string Arch = ArchSplit.first;
44
45  std::string Triple(Arch);
46  Triple += '-';
47  Triple += ArchSplit.second;
48
49  // Force i<N>86 to i386.
50  if (Triple[0] == 'i' && isdigit(Triple[1]) &&
51      Triple[2] == '8' && Triple[3] == '6')
52    Triple[1] = '3';
53
54  // On darwin, we want to update the version to match that of the
55  // target.
56  std::string::size_type DarwinDashIdx = Triple.find("-darwin");
57  if (DarwinDashIdx != std::string::npos) {
58    Triple.resize(DarwinDashIdx + strlen("-darwin"));
59    Triple += getOSVersion();
60  }
61
62  return Triple::normalize(Triple);
63}
64