third_party/LLVM/lib/Support/SystemUtils.cpp

//===- SystemUtils.cpp - Utilities for low-level system tasks -------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains functions used to do a variety of low-level, often
// system-specific, tasks.
//
//===----------------------------------------------------------------------===//

#include "llvm/Support/SystemUtils.h"
#include "llvm/Support/Process.h"
#include "llvm/Support/Program.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;

bool llvm::CheckBitcodeOutputToConsole(raw_ostream &stream_to_check,
                                       bool print_warning) {
  if (stream_to_check.is_displayed()) {
    if (print_warning) {
      errs() << "WARNING: You're attempting to print out a bitcode file.\n"
                "This is inadvisable as it may cause display problems. If\n"
                "you REALLY want to taste LLVM bitcode first-hand, you\n"
                "can force output with the `-f' option.\n\n";
    }
    return true;
  }
  return false;
}

/// PrependMainExecutablePath - Prepend the path to the program being executed
/// to \p ExeName, given the value of argv[0] and the address of main()
/// itself. This allows us to find another LLVM tool if it is built in the same
/// directory. An empty string is returned on error; note that this function
/// just mainpulates the path and doesn't check for executability.
/// @brief Find a named executable.
sys::Path llvm::PrependMainExecutablePath(const std::string &ExeName,
                                          const char *Argv0, void *MainAddr) {
  // Check the directory that the calling program is in.  We can do
  // this if ProgramPath contains at least one / character, indicating that it
  // is a relative path to the executable itself.
  sys::Path Result = sys::Path::GetMainExecutable(Argv0, MainAddr);
  Result.eraseComponent();

  if (!Result.isEmpty()) {
    Result.appendComponent(ExeName);
    Result.appendSuffix(sys::Path::GetEXESuffix());
  }

  return Result;
}