lib/Support/SystemUtils.cpp

   1 //===- SystemUtils.cpp - Utilities for low-level system tasks -------------===//
   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 contains functions used to do a variety of low-level, often
  11 // system-specific, tasks.
  12 //
  13 //===----------------------------------------------------------------------===//
  14
  15 #include "llvm/Support/Streams.h"
  16 #include "llvm/Support/SystemUtils.h"
  17 #include "llvm/System/Process.h"
  18 #include "llvm/System/Program.h"
  19 #include <ostream>
  20 using namespace llvm;
  21
  22 bool llvm::CheckBitcodeOutputToConsole(std::ostream* stream_to_check,
  23                                        bool print_warning) {
  24   if (stream_to_check == cout.stream() &&
  25       sys::Process::StandardOutIsDisplayed()) {
  26     if (print_warning) {
  27       cerr << "WARNING: You're attempting to print out a bitcode file.\n"
  28            << "This is inadvisable as it may cause display problems. If\n"
  29            << "you REALLY want to taste LLVM bitcode first-hand, you\n"
  30            << "can force output with the `-f' option.\n\n";
  31     }
  32     return true;
  33   }
  34   return false;
  35 }
  36
  37 /// FindExecutable - Find a named executable, giving the argv[0] of program
  38 /// being executed. This allows us to find another LLVM tool if it is built
  39 /// into the same directory, but that directory is neither the current
  40 /// directory, nor in the PATH.  If the executable cannot be found, return an
  41 /// empty string.
  42 ///
  43 #undef FindExecutable   // needed on windows :(
  44 sys::Path llvm::FindExecutable(const std::string &ExeName,
  45                                const std::string &ProgramPath) {
  46   // First check the directory that the calling program is in.  We can do this
  47   // if ProgramPath contains at least one / character, indicating that it is a
  48   // relative path to bugpoint itself.
  49   sys::Path Result ( ProgramPath );
  50   Result.eraseComponent();
  51   if (!Result.isEmpty()) {
  52     Result.appendComponent(ExeName);
  53     if (Result.canExecute())
  54       return Result;
  55   }
  56
  57   return sys::Program::FindProgramByName(ExeName);
  58 }