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47d3d1e5ef
Today, we always take into account the possibility that object files produced by MC may be consumed by an incremental linker. This results in us initialing fields which vary with time (TimeDateStamp) which harms hermetic builds (e.g. verifying a self-host went well) and produces sub-optimal code because we cannot assume anything about the relative position of functions within a section (call sites can get redirected through incremental linker thunks). Let's provide an MCTargetOption which controls this behavior so that we can disable this functionality if we know a-priori that the build will not rely on /incremental. llvm-svn: 256203
75 lines
2.8 KiB
C++
75 lines
2.8 KiB
C++
//===-- MCTargetOptionsCommandFlags.h --------------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file contains machine code-specific flags that are shared between
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// different command line tools.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_MC_MCTARGETOPTIONSCOMMANDFLAGS_H
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#define LLVM_MC_MCTARGETOPTIONSCOMMANDFLAGS_H
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#include "llvm/MC/MCTargetOptions.h"
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#include "llvm/Support/CommandLine.h"
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using namespace llvm;
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cl::opt<MCTargetOptions::AsmInstrumentation> AsmInstrumentation(
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"asm-instrumentation", cl::desc("Instrumentation of inline assembly and "
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"assembly source files"),
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cl::init(MCTargetOptions::AsmInstrumentationNone),
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cl::values(clEnumValN(MCTargetOptions::AsmInstrumentationNone, "none",
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"no instrumentation at all"),
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clEnumValN(MCTargetOptions::AsmInstrumentationAddress, "address",
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"instrument instructions with memory arguments"),
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clEnumValEnd));
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cl::opt<bool> RelaxAll("mc-relax-all",
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cl::desc("When used with filetype=obj, "
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"relax all fixups in the emitted object file"));
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cl::opt<bool> IncrementalLinkerCompatible(
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"incremental-linker-compatible",
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cl::desc(
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"When used with filetype=obj, "
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"emit an object file which can be used with an incremental linker"));
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cl::opt<int> DwarfVersion("dwarf-version", cl::desc("Dwarf version"),
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cl::init(0));
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cl::opt<bool> ShowMCInst("asm-show-inst",
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cl::desc("Emit internal instruction representation to "
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"assembly file"));
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cl::opt<bool> FatalWarnings("fatal-warnings",
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cl::desc("Treat warnings as errors"));
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cl::opt<bool> NoWarn("no-warn", cl::desc("Suppress all warnings"));
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cl::alias NoWarnW("W", cl::desc("Alias for --no-warn"), cl::aliasopt(NoWarn));
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cl::opt<std::string>
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ABIName("target-abi", cl::Hidden,
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cl::desc("The name of the ABI to be targeted from the backend."),
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cl::init(""));
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static inline MCTargetOptions InitMCTargetOptionsFromFlags() {
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MCTargetOptions Options;
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Options.SanitizeAddress =
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(AsmInstrumentation == MCTargetOptions::AsmInstrumentationAddress);
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Options.MCRelaxAll = RelaxAll;
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Options.MCIncrementalLinkerCompatible = IncrementalLinkerCompatible;
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Options.DwarfVersion = DwarfVersion;
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Options.ShowMCInst = ShowMCInst;
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Options.ABIName = ABIName;
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Options.MCFatalWarnings = FatalWarnings;
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Options.MCNoWarn = NoWarn;
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return Options;
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}
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#endif
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