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[rustc.git] / src / llvm / lib / Support / Unix / Host.inc
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 std::string sys::getDefaultTargetTriple() {
38 StringRef TargetTripleString(LLVM_DEFAULT_TARGET_TRIPLE);
39 std::pair<StringRef, StringRef> ArchSplit = TargetTripleString.split('-');
40
41 // Normalize the arch, since the target triple may not actually match the
42 // target.
43 std::string Arch = ArchSplit.first;
44
45 std::string Triple(Arch);
46 Triple += '-';
47 Triple += ArchSplit.second;
48
49 // Force i<N>86 to i386.
50 if (Triple[0] == 'i' && isdigit(Triple[1]) &&
51 Triple[2] == '8' && Triple[3] == '6')
52 Triple[1] = '3';
53
54 // On darwin, we want to update the version to match that of the
55 // target.
56 std::string::size_type DarwinDashIdx = Triple.find("-darwin");
57 if (DarwinDashIdx != std::string::npos) {
58 Triple.resize(DarwinDashIdx + strlen("-darwin"));
59 Triple += getOSVersion();
60 }
61
62 return Triple::normalize(Triple);
63 }