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 }