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 "llvm/Config/config.h"
20#include "llvm/ADT/StringRef.h"
21#include "Unix.h"
22#include <sys/utsname.h>
23#include <cctype>
24#include <string>
25#include <cstdlib> // ::getenv
26
27using namespace llvm;
28
29#ifdef __FreeBSD__
30std::string sys::getDefaultTargetTriple() {
31  return LLVM_DEFAULT_TARGET_TRIPLE;
32}
33#else // __FreeBSD__
34static std::string getOSVersion() {
35  struct utsname info;
36
37  if (uname(&info))
38    return "";
39
40  return info.release;
41}
42
43std::string sys::getDefaultTargetTriple() {
44  StringRef TargetTripleString(LLVM_DEFAULT_TARGET_TRIPLE);
45  std::pair<StringRef, StringRef> ArchSplit = TargetTripleString.split('-');
46
47  // Normalize the arch, since the target triple may not actually match the target.
48  std::string Arch = ArchSplit.first;
49
50  std::string Triple(Arch);
51  Triple += '-';
52  Triple += ArchSplit.second;
53
54  // Force i<N>86 to i386.
55  if (Triple[0] == 'i' && isdigit(Triple[1]) &&
56      Triple[2] == '8' && Triple[3] == '6')
57    Triple[1] = '3';
58
59  // On darwin, we want to update the version to match that of the
60  // target.
61  std::string::size_type DarwinDashIdx = Triple.find("-darwin");
62  if (DarwinDashIdx != std::string::npos) {
63    Triple.resize(DarwinDashIdx + strlen("-darwin"));
64    Triple += getOSVersion();
65  }
66
67  return Triple;
68}
69#endif // __FreeBSD__
70