LLVM  6.0.0svn
Host.inc
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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 
26 using namespace llvm;
27 
28 static std::string getOSVersion() {
29  struct utsname info;
30 
31  if (uname(&info))
32  return "";
33 
34  return info.release;
35 }
36 
37 static std::string updateTripleOSVersion(std::string TargetTripleString) {
38  // On darwin, we want to update the version to match that of the target.
39  std::string::size_type DarwinDashIdx = TargetTripleString.find("-darwin");
40  if (DarwinDashIdx != std::string::npos) {
41  TargetTripleString.resize(DarwinDashIdx + strlen("-darwin"));
42  TargetTripleString += getOSVersion();
43  return TargetTripleString;
44  }
45  std::string::size_type MacOSDashIdx = TargetTripleString.find("-macos");
46  if (MacOSDashIdx != std::string::npos) {
47  TargetTripleString.resize(MacOSDashIdx);
48  // Reset the OS to darwin as the OS version from `uname` doesn't use the
49  // macOS version scheme.
50  TargetTripleString += "-darwin";
51  TargetTripleString += getOSVersion();
52  }
53  return TargetTripleString;
54 }
55 
56 std::string sys::getDefaultTargetTriple() {
57  std::string TargetTripleString =
58  updateTripleOSVersion(LLVM_DEFAULT_TARGET_TRIPLE);
59 
60  // Override the default target with an environment variable named by
61  // LLVM_TARGET_TRIPLE_ENV.
62 #if defined(LLVM_TARGET_TRIPLE_ENV)
63  if (const char *EnvTriple = std::getenv(LLVM_TARGET_TRIPLE_ENV))
64  TargetTripleString = EnvTriple;
65 #endif
66 
67  return Triple::normalize(TargetTripleString);
68 }
Compute iterated dominance frontiers using a linear time algorithm.
Definition: AllocatorList.h:24
std::string getDefaultTargetTriple()
getDefaultTargetTriple() - Return the default target triple the compiler has been configured to produ...
lazy value info
std::string normalize() const
Return the normalized form of this triple&#39;s string.
Definition: Triple.h:277