1//===- llvm/TargetParser/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 "llvm/ADT/StringRef.h"
19#include "llvm/Config/config.h"
20#include <cctype>
21#include <string>
22#include <sys/utsname.h>
23
24#ifdef HAVE_UNISTD_H
25#include <unistd.h>
26#endif
27
28using namespace llvm;
29
30static std::string getOSVersion() {
31 struct utsname info;
32
33 if (uname(name: &info))
34 return "";
35
36 return info.release;
37}
38
39static std::string updateTripleOSVersion(std::string TargetTripleString) {
40 // On darwin, we want to update the version to match that of the target.
41 std::string::size_type DarwinDashIdx = TargetTripleString.find(s: "-darwin");
42 if (DarwinDashIdx != std::string::npos) {
43 TargetTripleString.resize(n: DarwinDashIdx + strlen(s: "-darwin"));
44 TargetTripleString += getOSVersion();
45 return TargetTripleString;
46 }
47 std::string::size_type MacOSDashIdx = TargetTripleString.find(s: "-macos");
48 if (MacOSDashIdx != std::string::npos) {
49 TargetTripleString.resize(n: MacOSDashIdx);
50 // Reset the OS to darwin as the OS version from `uname` doesn't use the
51 // macOS version scheme.
52 TargetTripleString += "-darwin";
53 TargetTripleString += getOSVersion();
54 }
55 // On AIX, the AIX version and release should be that of the current host
56 // unless if the version has already been specified.
57 if (Triple(LLVM_HOST_TRIPLE).getOS() == Triple::AIX) {
58 Triple TT(std::move(TargetTripleString));
59 if (TT.getOS() == Triple::AIX && !TT.getOSMajorVersion()) {
60 struct utsname name;
61 if (uname(name: &name) != -1) {
62 std::string NewOSName = std::string(Triple::getOSTypeName(Kind: Triple::AIX));
63 NewOSName += name.version;
64 NewOSName += '.';
65 NewOSName += name.release;
66 NewOSName += ".0.0";
67 TT.setOSName(NewOSName);
68 return TT.str();
69 }
70 }
71 }
72 return TargetTripleString;
73}
74
75std::string sys::getDefaultTargetTriple() {
76 std::string TargetTripleString =
77 updateTripleOSVersion(LLVM_DEFAULT_TARGET_TRIPLE);
78
79 // Override the default target with an environment variable named by
80 // LLVM_TARGET_TRIPLE_ENV.
81#if defined(LLVM_TARGET_TRIPLE_ENV)
82 if (const char *EnvTriple = std::getenv(LLVM_TARGET_TRIPLE_ENV))
83 TargetTripleString = EnvTriple;
84#endif
85
86 return TargetTripleString;
87}
88