lib/Support/SystemUtils.cpp

   1 //===- SystemUtils.cpp - Utilities for low-level system tasks -------------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file was developed by the LLVM research group and is distributed under
   6 // the University of Illinois Open Source 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/SystemUtils.h"
  16 #include "llvm/System/Process.h"
  17 #include "llvm/System/Program.h"
  18 #include <iostream>
  19 using namespace llvm;
  20
  21 bool llvm::CheckBytecodeOutputToConsole(std::ostream* stream_to_check,
  22                                         bool print_warning) {
  23   if (stream_to_check == &std::cout && sys::Process::StandardOutIsDisplayed()) {
  24     if (print_warning) {
  25       std::cerr << "WARNING: You're attempting to print out a bytecode file.\n"
  26                    "This is inadvisable as it may cause display problems. If\n"
  27                    "you REALLY want to taste LLVM bytecode first-hand, you\n"
  28                    "can force output with the `-f' option.\n\n";
  29     }
  30     return true;
  31   }
  32   return false;
  33 }
  34
  35 /// FindExecutable - Find a named executable, giving the argv[0] of program
  36 /// being executed. This allows us to find another LLVM tool if it is built
  37 /// into the same directory, but that directory is neither the current
  38 /// directory, nor in the PATH.  If the executable cannot be found, return an
  39 /// empty string.
  40 ///
  41 #undef FindExecutable   // needed on windows :(
  42 sys::Path llvm::FindExecutable(const std::string &ExeName,
  43                                const std::string &ProgramPath) {
  44   // First check the directory that the calling program is in.  We can do this
  45   // if ProgramPath contains at least one / character, indicating that it is a
  46   // relative path to bugpoint itself.
  47   sys::Path Result ( ProgramPath );
  48   Result.eraseComponent();
  49   if (!Result.isEmpty()) {
  50     Result.appendComponent(ExeName);
  51     if (Result.canExecute())
  52       return Result;
  53   }
  54
  55   return sys::Program::FindProgramByName(ExeName);
  56 }