/usr/include/llvm-3.8/llvm/MC/MCTargetOptionsCommandFlags.h is in llvm-3.8-dev 1:3.8-2ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74  | //===-- MCTargetOptionsCommandFlags.h --------------------------*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains machine code-specific flags that are shared between
// different command line tools.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_MC_MCTARGETOPTIONSCOMMANDFLAGS_H
#define LLVM_MC_MCTARGETOPTIONSCOMMANDFLAGS_H
#include "llvm/MC/MCTargetOptions.h"
#include "llvm/Support/CommandLine.h"
using namespace llvm;
cl::opt<MCTargetOptions::AsmInstrumentation> AsmInstrumentation(
    "asm-instrumentation", cl::desc("Instrumentation of inline assembly and "
                                    "assembly source files"),
    cl::init(MCTargetOptions::AsmInstrumentationNone),
    cl::values(clEnumValN(MCTargetOptions::AsmInstrumentationNone, "none",
                          "no instrumentation at all"),
               clEnumValN(MCTargetOptions::AsmInstrumentationAddress, "address",
                          "instrument instructions with memory arguments"),
               clEnumValEnd));
cl::opt<bool> RelaxAll("mc-relax-all",
                       cl::desc("When used with filetype=obj, "
                                "relax all fixups in the emitted object file"));
cl::opt<bool> IncrementalLinkerCompatible(
    "incremental-linker-compatible",
    cl::desc(
        "When used with filetype=obj, "
        "emit an object file which can be used with an incremental linker"));
cl::opt<int> DwarfVersion("dwarf-version", cl::desc("Dwarf version"),
                          cl::init(0));
cl::opt<bool> ShowMCInst("asm-show-inst",
                         cl::desc("Emit internal instruction representation to "
                                  "assembly file"));
cl::opt<bool> FatalWarnings("fatal-warnings",
                            cl::desc("Treat warnings as errors"));
cl::opt<bool> NoWarn("no-warn", cl::desc("Suppress all warnings"));
cl::alias NoWarnW("W", cl::desc("Alias for --no-warn"), cl::aliasopt(NoWarn));
cl::opt<std::string>
ABIName("target-abi", cl::Hidden,
        cl::desc("The name of the ABI to be targeted from the backend."),
        cl::init(""));
static inline MCTargetOptions InitMCTargetOptionsFromFlags() {
  MCTargetOptions Options;
  Options.SanitizeAddress =
      (AsmInstrumentation == MCTargetOptions::AsmInstrumentationAddress);
  Options.MCRelaxAll = RelaxAll;
  Options.MCIncrementalLinkerCompatible = IncrementalLinkerCompatible;
  Options.DwarfVersion = DwarfVersion;
  Options.ShowMCInst = ShowMCInst;
  Options.ABIName = ABIName;
  Options.MCFatalWarnings = FatalWarnings;
  Options.MCNoWarn = NoWarn;
  return Options;
}
#endif
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