LLVM  9.0.0svn
Host.inc
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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 
25 using namespace llvm;
26 
27 static std::string getOSVersion() {
28  struct utsname info;
29 
30  if (uname(&info))
31  return "";
32 
33  return info.release;
34 }
35 
36 static 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 
72 std::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 }
This class represents lattice values for constants.
Definition: AllocatorList.h:23
std::string getDefaultTargetTriple()
getDefaultTargetTriple() - Return the default target triple the compiler has been configured to produ...
static StringRef getOSTypeName(OSType Kind)
getOSTypeName - Get the canonical name for the Kind operating system.
Definition: Triple.cpp:175
lazy value info
Triple - Helper class for working with autoconf configuration names.
Definition: Triple.h:43
static const char * name