1 //===- llvm/Support/Unix/Host.inc -------------------------------*- C++ -*-===//
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
7 //===----------------------------------------------------------------------===//
9 // This file implements the UNIX Host support.
11 //===----------------------------------------------------------------------===//
13 //===----------------------------------------------------------------------===//
14 //=== WARNING: Implementation here must contain only generic UNIX code that
15 //=== is guaranteed to work on *all* UNIX variants.
16 //===----------------------------------------------------------------------===//
19 #include "llvm/ADT/StringRef.h"
20 #include "llvm/Config/config.h"
23 #include <sys/utsname.h>
27 static std::string getOSVersion() {
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;
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();
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()) {
58 if (uname(&name) != -1) {
59 std::string NewOSName = Triple::getOSTypeName(Triple::AIX);
60 NewOSName += name.version;
62 NewOSName += name.release;
64 TT.setOSName(NewOSName);
69 return TargetTripleString;
72 std::string sys::getDefaultTargetTriple() {
73 std::string TargetTripleString =
74 updateTripleOSVersion(LLVM_DEFAULT_TARGET_TRIPLE);
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;
83 return TargetTripleString;