SystemUtils.cpp revision 193323 
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>
20using namespace llvm;
21
22bool 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 :(
44sys::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}
59