1//===- llvm/Support/Unix/Host.inc -------------------------------*- C++ -*-===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// This file implements the UNIX Host support.
10//
11//===----------------------------------------------------------------------===//
12
13//===----------------------------------------------------------------------===//
14//=== WARNING: Implementation here must contain only generic UNIX code that
15//===          is guaranteed to work on *all* UNIX variants.
16//===----------------------------------------------------------------------===//
17
18#include "Unix.h"
19#include "llvm/ADT/StringRef.h"
20#include "llvm/Config/config.h"
21#include <cctype>
22#include <string>
23#include <sys/utsname.h>
24
25using namespace llvm;
26
27static std::string getOSVersion() {
28  struct utsname info;
29
30  if (uname(&info))
31    return "";
32
33  return info.release;
34}
35
36static std::string updateTripleOSVersion(std::string TargetTripleString) {
37  // On darwin, we want to update the version to match that of the target.
38  std::string::size_type DarwinDashIdx = TargetTripleString.find("-darwin");
39  if (DarwinDashIdx != std::string::npos) {
40    TargetTripleString.resize(DarwinDashIdx + strlen("-darwin"));
41    TargetTripleString += getOSVersion();
42    return TargetTripleString;
43  }
44  std::string::size_type MacOSDashIdx = TargetTripleString.find("-macos");
45  if (MacOSDashIdx != std::string::npos) {
46    TargetTripleString.resize(MacOSDashIdx);
47    // Reset the OS to darwin as the OS version from `uname` doesn't use the
48    // macOS version scheme.
49    TargetTripleString += "-darwin";
50    TargetTripleString += getOSVersion();
51  }
52  // On AIX, the AIX version and release should be that of the current host
53  // unless if the version has already been specified.
54  if (Triple(LLVM_HOST_TRIPLE).getOS() == Triple::AIX) {
55    Triple TT(TargetTripleString);
56    if (TT.getOS() == Triple::AIX && !TT.getOSMajorVersion()) {
57      struct utsname name;
58      if (uname(&name) != -1) {
59        std::string NewOSName = Triple::getOSTypeName(Triple::AIX);
60        NewOSName += name.version;
61        NewOSName += '.';
62        NewOSName += name.release;
63        NewOSName += ".0.0";
64        TT.setOSName(NewOSName);
65        return TT.str();
66      }
67    }
68  }
69  return TargetTripleString;
70}
71
72std::string sys::getDefaultTargetTriple() {
73  std::string TargetTripleString =
74      updateTripleOSVersion(LLVM_DEFAULT_TARGET_TRIPLE);
75
76  // Override the default target with an environment variable named by
77  // LLVM_TARGET_TRIPLE_ENV.
78#if defined(LLVM_TARGET_TRIPLE_ENV)
79  if (const char *EnvTriple = std::getenv(LLVM_TARGET_TRIPLE_ENV))
80    TargetTripleString = EnvTriple;
81#endif
82
83  return TargetTripleString;
84}
85