tbaeder updated this revision to Diff 284308.
tbaeder added a comment.
Add a test that checks that clang accepts
`-Wa,--generate-missing-build-notes=yes` and
`-Wa,--generate-missing-build-notes=no`
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D84846/new/
https://reviews.llvm.org/D84846
Files:
clang/include/clang/Basic/CodeGenOptions.def
clang/include/clang/Driver/Options.td
clang/lib/CodeGen/BackendUtil.cpp
clang/lib/Driver/ToolChains/Clang.cpp
clang/lib/Frontend/CompilerInvocation.cpp
clang/test/Misc/generate-missing-build-notes.c
clang/tools/driver/cc1as_main.cpp
llvm/include/llvm/MC/MCContext.h
llvm/include/llvm/MC/MCTargetOptions.h
llvm/lib/CodeGen/LLVMTargetMachine.cpp
llvm/lib/MC/ELFObjectWriter.cpp
llvm/lib/MC/MCContext.cpp
llvm/lib/MC/MCTargetOptions.cpp
llvm/test/MC/ELF/build-notes.s
llvm/tools/llvm-mc/llvm-mc.cpp
Index: llvm/tools/llvm-mc/llvm-mc.cpp
===================================================================
--- llvm/tools/llvm-mc/llvm-mc.cpp
+++ llvm/tools/llvm-mc/llvm-mc.cpp
@@ -172,6 +172,10 @@
static cl::opt<bool> NoExecStack("no-exec-stack",
cl::desc("File doesn't need an exec stack"));
+static cl::opt<bool>
+ GenerateMissingBuildNotes("generate-missing-build-notes",
+ cl::desc("Generate missing GNU build notes"));
+
enum ActionType {
AC_AsLex,
AC_Assemble,
@@ -378,6 +382,9 @@
if (SaveTempLabels)
Ctx.setAllowTemporaryLabels(false);
+ if (GenerateMissingBuildNotes)
+ Ctx.setGenerateMissingBuildNotes(true);
+
Ctx.setGenDwarfForAssembly(GenDwarfForAssembly);
// Default to 4 for dwarf version.
unsigned DwarfVersion = MCOptions.DwarfVersion ? MCOptions.DwarfVersion : 4;
Index: llvm/test/MC/ELF/build-notes.s
===================================================================
--- /dev/null
+++ llvm/test/MC/ELF/build-notes.s
@@ -0,0 +1,55 @@
+// RUN: llvm-mc --generate-missing-build-notes -filetype=obj -triple x86_64-pc-linux-gnu %s -o - | llvm-readobj -r --section-relocations --hex-dump=.gnu.build.attributes - | FileCheck %s
+// RUN: llvm-mc --generate-missing-build-notes -filetype=obj -triple i386-pc-linux-gnu %s -o - | llvm-readobj -r --section-relocations --hex-dump=.gnu.build.attributes - | FileCheck %s --check-prefix=i386
+// RUN: llvm-mc --generate-missing-build-notes -filetype=obj -triple armeb-pc-linux-gnu %s -o - | llvm-readobj -r --section-relocations --hex-dump=.gnu.build.attributes - | FileCheck %s --check-prefix=armbe32
+
+ .text
+ .dc.l 1
+
+ .section .text.unused,"ax"
+ .space 1025
+
+ .section .gnu.linkonce,"ax"
+ .dc.l 3
+
+// CHECK: Relocations [
+// CHECK-NEXT: Section {{.*}} .rela.gnu.build.attributes {
+// CHECK-NEXT: 0x14 R_X86_64_64 .text 0x0
+// CHECK-NEXT: 0x1C R_X86_64_64 .text 0x4
+// CHECK-NEXT: 0x38 R_X86_64_64 .text.unused 0x0
+// CHECK-NEXT: 0x40 R_X86_64_64 .text.unused 0x401
+// CHECK-NEXT: }
+// CHECK-NEXT: ]
+// CHECK: Hex dump of section '.gnu.build.attributes':
+// CHECK-NEXT: 0x00000000 08000000 10000000 00010000 47412401 ............GA$.
+// CHECK-NEXT: 0x00000010 33613200 00000000 00000000 00000000 3a2.............
+// CHECK-NEXT: 0x00000020 00000000 08000000 10000000 00010000 ................
+// CHECK-NEXT: 0x00000030 47412401 33613200 00000000 00000000 GA$.3a2.........
+// CHECK-NEXT: 0x00000040 00000000 00000000 ........
+
+// i386: Relocations [
+// i386-NEXT: Section {{.*}} .rel.gnu.build.attributes {
+// i386-NEXT: 0x14 R_386_32 .text 0x0
+// i386-NEXT: 0x18 R_386_32 .text 0x0
+// i386-NEXT: 0x30 R_386_32 .text.unused 0x0
+// i386-NEXT: 0x34 R_386_32 .text.unused 0x0
+// i386-NEXT: }
+// i386-NEXT: ]
+// i386: Hex dump of section '.gnu.build.attributes':
+// i386-NEXT: 0x00000000 08000000 08000000 00010000 47412401 ............GA$.
+// i386-NEXT: 0x00000010 33613200 00000000 04000000 08000000 3a2.............
+// i386-NEXT: 0x00000020 08000000 00010000 47412401 33613200 ........GA$.3a2.
+// i386-NEXT: 0x00000030 00000000 01040000 ........
+
+// armbe32: Relocations [
+// armbe32-NEXT: Section {{.*}} .rel.gnu.build.attributes {
+// armbe32-NEXT: 0x14 R_ARM_ABS32 .text 0x0
+// armbe32-NEXT: 0x18 R_ARM_ABS32 .text 0x0
+// armbe32-NEXT: 0x30 R_ARM_ABS32 .text.unused 0x0
+// armbe32-NEXT: 0x34 R_ARM_ABS32 .text.unused 0x0
+// armbe32-NEXT: }
+// armbe32-NEXT: ]
+// armbe32: Hex dump of section '.gnu.build.attributes':
+// armbe32-NEXT: 0x00000000 00000008 00000008 00000100 47412401 ............GA$.
+// armbe32-NEXT: 0x00000010 33613200 00000000 00000004 00000008 3a2.............
+// armbe32-NEXT: 0x00000020 00000008 00000100 47412401 33613200 ........GA$.3a2.
+// armbe32-NEXT: 0x00000030 00000000 00000401 ........
Index: llvm/lib/MC/MCTargetOptions.cpp
===================================================================
--- llvm/lib/MC/MCTargetOptions.cpp
+++ llvm/lib/MC/MCTargetOptions.cpp
@@ -15,8 +15,9 @@
: MCRelaxAll(false), MCNoExecStack(false), MCFatalWarnings(false),
MCNoWarn(false), MCNoDeprecatedWarn(false), MCSaveTempLabels(false),
MCUseDwarfDirectory(false), MCIncrementalLinkerCompatible(false),
- ShowMCEncoding(false), ShowMCInst(false), AsmVerbose(false),
- PreserveAsmComments(true), Dwarf64(false) {}
+ MCGenerateMissingBuildNotes(false), ShowMCEncoding(false),
+ ShowMCInst(false), AsmVerbose(false), PreserveAsmComments(true),
+ Dwarf64(false) {}
StringRef MCTargetOptions::getABIName() const {
return ABIName;
Index: llvm/lib/MC/MCContext.cpp
===================================================================
--- llvm/lib/MC/MCContext.cpp
+++ llvm/lib/MC/MCContext.cpp
@@ -476,6 +476,21 @@
LinkedToSym);
}
+bool MCContext::hasELFSection(const Twine &Section, const MCSymbolELF *GroupSym,
+ unsigned UniqueID,
+ const MCSymbolELF *LinkedToSym) {
+ StringRef Group = "";
+ if (GroupSym)
+ Group = GroupSym->getName();
+ assert(!(LinkedToSym && LinkedToSym->getName().empty()));
+
+ auto key = ELFUniquingMap.find(
+ ELFSectionKey{Section.str(), Group,
+ LinkedToSym ? LinkedToSym->getName() : "", UniqueID});
+
+ return key != ELFUniquingMap.end();
+}
+
MCSectionELF *MCContext::getELFSection(const Twine &Section, unsigned Type,
unsigned Flags, unsigned EntrySize,
const MCSymbolELF *GroupSym,
Index: llvm/lib/MC/ELFObjectWriter.cpp
===================================================================
--- llvm/lib/MC/ELFObjectWriter.cpp
+++ llvm/lib/MC/ELFObjectWriter.cpp
@@ -222,6 +222,10 @@
void writeRelocations(const MCAssembler &Asm, const MCSectionELF &Sec);
+ void writeBuildNote(MCContext &Ctx, const MCSectionELF *Section,
+ const MCSectionELF *BuildAttributes,
+ uint64_t BuildAttributesStart,
+ SectionOffsetsTy &SectionOffsets);
uint64_t writeObject(MCAssembler &Asm, const MCAsmLayout &Layout);
void writeSection(const SectionIndexMapTy &SectionIndexMap,
uint32_t GroupSymbolIndex, uint64_t Offset, uint64_t Size,
@@ -1070,6 +1074,68 @@
}
}
+void ELFWriter::writeBuildNote(MCContext &Ctx, const MCSectionELF *Section,
+ const MCSectionELF *BuildAttributes,
+ uint64_t BuildAttributesStart,
+ SectionOffsetsTy &SectionOffsets) {
+ const MCSymbolELF *SectionSymbol =
+ static_cast<const MCSymbolELF *>(Section->getBeginSymbol());
+ const uint64_t BuildNoteSize = is64Bit() ? 36 : 28;
+ const uint64_t RelEndOffset = is64Bit() ? 28 : 24;
+ const uint64_t SectionOffset = W.OS.tell() - BuildAttributesStart;
+ const uint64_t SectionSize =
+ SectionOffsets[Section].second - SectionOffsets[Section].first;
+ const uint64_t BuildNoteStart = W.OS.tell();
+
+ W.write<uint32_t>(8); // strlen(name) + 1
+ W.write<uint32_t>(is64Bit() ? 16 : 8); // Two N-byte offsets
+ W.write<uint32_t>(ELF::NT_GNU_BUILD_ATTRIBUTE_OPEN);
+
+ // The a2 version number indicates that this note was
+ // generated by the LLVM assembler and not the annobin plugin.
+ W.write<uint8_t>('G');
+ W.write<uint8_t>('A');
+ W.write<uint8_t>('$');
+ W.write<uint8_t>('');
+ W.write<uint8_t>('3');
+ W.write<uint8_t>('a');
+ W.write<uint8_t>('2');
+ W.write<uint8_t>('\0');
+
+ // 20 bytes so far
+ assert(W.OS.tell() - BuildNoteStart == 20);
+
+ if (!hasRelocationAddend()) {
+ if (is64Bit()) {
+ W.write<uint64_t>(SectionSize);
+ } else {
+ W.OS.write_zeros(4);
+ W.write<uint32_t>(SectionSize);
+ }
+ }
+
+ W.OS.write_zeros(BuildNoteSize -
+ (W.OS.tell() - BuildNoteStart)); // Fill up with zeroes
+
+ MCFixup Fixup = MCFixup::create(SectionOffset, nullptr,
+ is64Bit() ? MCFixupKind::FK_Data_8
+ : MCFixupKind::FK_Data_4);
+ MCValue Value = MCValue::get(nullptr, nullptr, 0, 0);
+ auto RelocType =
+ OWriter.TargetObjectWriter->getRelocType(Ctx, Value, Fixup, false);
+
+ SectionSymbol->setUsedInReloc();
+ // Create a relocation to install the start address of the note
+ ELFRelocationEntry RelStart(SectionOffset + 20, SectionSymbol, RelocType, 0,
+ nullptr, 0);
+ OWriter.Relocations[BuildAttributes].push_back(RelStart);
+
+ // ... and one to install the end address
+ ELFRelocationEntry RelEnd(SectionOffset + RelEndOffset, SectionSymbol,
+ RelocType, SectionSize, nullptr, 0);
+ OWriter.Relocations[BuildAttributes].push_back(RelEnd);
+}
+
uint64_t ELFWriter::writeObject(MCAssembler &Asm, const MCAsmLayout &Layout) {
uint64_t StartOffset = W.OS.tell();
@@ -1135,6 +1201,47 @@
OWriter.TargetObjectWriter->addTargetSectionFlags(Ctx, Section);
}
+ // .gnu.build.attributes section
+ if (Ctx.getGenerateMissingBuildNotes() &&
+ !Ctx.hasELFSection(".gnu.build.attributes", nullptr,
+ MCSection::NonUniqueID, nullptr)) {
+ MCSectionELF *BuildAttributes =
+ Ctx.getELFSection(".gnu.build.attributes", ELF::SHT_NOTE, 0);
+ BuildAttributes->setAlignment(Align(2));
+ SectionIndexMap[BuildAttributes] = addToSectionTable(BuildAttributes);
+
+ // Create a build note for each code section
+ const uint64_t BuildAttributesStart = W.OS.tell();
+ for (const MCSection &Section : Asm) {
+ const MCSectionELF *SectionELF =
+ static_cast<const MCSectionELF *>(&Section);
+
+ if (Section.getKind().isMetadata())
+ continue;
+
+ if (!Section.hasInstructions() && !Section.getKind().isText())
+ continue;
+
+ // TODO: Are linkonce sections marked in any other way?
+ if (Section.getName().startswith(".gnu.linkonce"))
+ continue;
+
+ writeBuildNote(Ctx, SectionELF, BuildAttributes, BuildAttributesStart,
+ SectionOffsets);
+ }
+ const uint64_t BuildAttributesEnd = W.OS.tell();
+
+ if (BuildAttributesEnd != BuildAttributesStart) {
+ SectionOffsets[BuildAttributes] =
+ std::make_pair(BuildAttributesStart, BuildAttributesEnd);
+
+ auto RelocSection = createRelocationSection(Ctx, *BuildAttributes);
+ assert(RelocSection);
+ SectionIndexMap[RelocSection] = addToSectionTable(RelocSection);
+ Relocations.push_back(RelocSection);
+ }
+ }
+
MCSectionELF *CGProfileSection = nullptr;
if (!Asm.CGProfile.empty()) {
CGProfileSection = Ctx.getELFSection(".llvm.call-graph-profile",
Index: llvm/lib/CodeGen/LLVMTargetMachine.cpp
===================================================================
--- llvm/lib/CodeGen/LLVMTargetMachine.cpp
+++ llvm/lib/CodeGen/LLVMTargetMachine.cpp
@@ -121,6 +121,9 @@
if (Options.MCOptions.MCSaveTempLabels)
Context.setAllowTemporaryLabels(false);
+ if (Options.MCOptions.MCGenerateMissingBuildNotes)
+ Context.setGenerateMissingBuildNotes(true);
+
const MCSubtargetInfo &STI = *getMCSubtargetInfo();
const MCAsmInfo &MAI = *getMCAsmInfo();
const MCRegisterInfo &MRI = *getMCRegisterInfo();
@@ -227,6 +230,9 @@
if (Options.MCOptions.MCSaveTempLabels)
Ctx->setAllowTemporaryLabels(false);
+ if (Options.MCOptions.MCGenerateMissingBuildNotes)
+ Ctx->setGenerateMissingBuildNotes(true);
+
// Create the code emitter for the target if it exists. If not, .o file
// emission fails.
const MCSubtargetInfo &STI = *getMCSubtargetInfo();
Index: llvm/include/llvm/MC/MCTargetOptions.h
===================================================================
--- llvm/include/llvm/MC/MCTargetOptions.h
+++ llvm/include/llvm/MC/MCTargetOptions.h
@@ -47,6 +47,7 @@
bool MCSaveTempLabels : 1;
bool MCUseDwarfDirectory : 1;
bool MCIncrementalLinkerCompatible : 1;
+ bool MCGenerateMissingBuildNotes : 1;
bool ShowMCEncoding : 1;
bool ShowMCInst : 1;
bool AsmVerbose : 1;
Index: llvm/include/llvm/MC/MCContext.h
===================================================================
--- llvm/include/llvm/MC/MCContext.h
+++ llvm/include/llvm/MC/MCContext.h
@@ -195,6 +195,7 @@
/// Darwin).
bool AllowTemporaryLabels = true;
bool UseNamesOnTempLabels = false;
+ bool GenerateMissingBuildNotes = false;
/// The Compile Unit ID that we are currently processing.
unsigned DwarfCompileUnitID = 0;
@@ -371,6 +372,12 @@
void setAllowTemporaryLabels(bool Value) { AllowTemporaryLabels = Value; }
void setUseNamesOnTempLabels(bool Value) { UseNamesOnTempLabels = Value; }
+ void setGenerateMissingBuildNotes(bool Value) {
+ GenerateMissingBuildNotes = Value;
+ }
+ bool getGenerateMissingBuildNotes() const {
+ return GenerateMissingBuildNotes;
+ }
/// \name Module Lifetime Management
/// @{
@@ -472,6 +479,9 @@
BeginSymName);
}
+ bool hasELFSection(const Twine &Section, const MCSymbolELF *GroupSym,
+ unsigned UniqueID, const MCSymbolELF *LinkedToSym);
+
MCSectionELF *getELFSection(const Twine &Section, unsigned Type,
unsigned Flags) {
return getELFSection(Section, Type, Flags, 0, "");
Index: clang/tools/driver/cc1as_main.cpp
===================================================================
--- clang/tools/driver/cc1as_main.cpp
+++ clang/tools/driver/cc1as_main.cpp
@@ -133,6 +133,7 @@
unsigned NoExecStack : 1;
unsigned FatalWarnings : 1;
unsigned NoWarn : 1;
+ unsigned GenerateMissingBuildNotes : 1;
unsigned IncrementalLinkerCompatible : 1;
unsigned EmbedBitcode : 1;
@@ -159,6 +160,7 @@
NoExecStack = 0;
FatalWarnings = 0;
NoWarn = 0;
+ GenerateMissingBuildNotes = 0;
IncrementalLinkerCompatible = 0;
DwarfVersion = 0;
EmbedBitcode = 0;
@@ -295,6 +297,8 @@
Opts.NoExecStack = Args.hasArg(OPT_mno_exec_stack);
Opts.FatalWarnings = Args.hasArg(OPT_massembler_fatal_warnings);
Opts.NoWarn = Args.hasArg(OPT_massembler_no_warn);
+ Opts.GenerateMissingBuildNotes =
+ Args.hasArg(OPT_massembler_generate_missing_build_notes);
Opts.RelocationModel =
std::string(Args.getLastArgValue(OPT_mrelocation_model, "pic"));
Opts.TargetABI = std::string(Args.getLastArgValue(OPT_target_abi));
@@ -426,6 +430,8 @@
if (Opts.GenDwarfForAssembly)
Ctx.setGenDwarfRootFile(Opts.InputFile,
SrcMgr.getMemoryBuffer(BufferIndex)->getBuffer());
+ if (Opts.GenerateMissingBuildNotes)
+ Ctx.setGenerateMissingBuildNotes(true);
// Build up the feature string from the target feature list.
std::string FS = llvm::join(Opts.Features, ",");
@@ -441,6 +447,7 @@
MCOptions.MCNoWarn = Opts.NoWarn;
MCOptions.MCFatalWarnings = Opts.FatalWarnings;
+ MCOptions.MCGenerateMissingBuildNotes = Opts.GenerateMissingBuildNotes;
MCOptions.ABIName = Opts.TargetABI;
// FIXME: There is a bit of code duplication with addPassesToEmitFile.
Index: clang/test/Misc/generate-missing-build-notes.c
===================================================================
--- /dev/null
+++ clang/test/Misc/generate-missing-build-notes.c
@@ -0,0 +1,13 @@
+// RUN: %clang -c -Wa,--generate-missing-build-notes=yes %s -o - | llvm-readobj -r --section-relocations - | FileCheck %s
+
+int main(int argc, char **argv) {
+ return 0;
+}
+
+// CHECK: Section {{.*}} .rela.gnu.build.attributes {
+// CHECK-NEXT: 0x14 R_X86_64_64 .text 0x0
+// CHECK-NEXT: 0x1C R_X86_64_64 .text 0x16
+// CHECK-NEXT: }
+
+// Run this one as well, just to check that =no is accepted.
+// RUN: %clang -c -Wa,--generate-missing-build-notes=no %s -o -
Index: clang/lib/Frontend/CompilerInvocation.cpp
===================================================================
--- clang/lib/Frontend/CompilerInvocation.cpp
+++ clang/lib/Frontend/CompilerInvocation.cpp
@@ -948,6 +948,8 @@
getLastArgIntValue(Args, OPT_msmall_data_limit, 0, Diags);
Opts.FatalWarnings = Args.hasArg(OPT_massembler_fatal_warnings);
Opts.NoWarn = Args.hasArg(OPT_massembler_no_warn);
+ Opts.GenerateMissingBuildNotes =
+ Args.hasArg(OPT_massembler_generate_missing_build_notes);
Opts.EnableSegmentedStacks = Args.hasArg(OPT_split_stacks);
Opts.RelaxAll = Args.hasArg(OPT_mrelax_all);
Opts.IncrementalLinkerCompatible =
Index: clang/lib/Driver/ToolChains/Clang.cpp
===================================================================
--- clang/lib/Driver/ToolChains/Clang.cpp
+++ clang/lib/Driver/ToolChains/Clang.cpp
@@ -2276,6 +2276,7 @@
bool UseRelaxRelocations = C.getDefaultToolChain().useRelaxRelocations();
bool UseNoExecStack = C.getDefaultToolChain().isNoExecStackDefault();
+ bool UseGenerateMissingBuildNotes = false;
const char *MipsTargetFeature = nullptr;
for (const Arg *A :
Args.filtered(options::OPT_Wa_COMMA, options::OPT_Xassembler)) {
@@ -2358,6 +2359,10 @@
CmdArgs.push_back("-massembler-fatal-warnings");
} else if (Value == "--no-warn" || Value == "-W") {
CmdArgs.push_back("-massembler-no-warn");
+ } else if (Value == "--generate-missing-build-notes=yes") {
+ UseGenerateMissingBuildNotes = true;
+ } else if (Value == "--generate-missing-build-notes=no") {
+ UseGenerateMissingBuildNotes = false;
} else if (Value == "--noexecstack") {
UseNoExecStack = true;
} else if (Value.startswith("-compress-debug-sections") ||
@@ -2430,6 +2435,8 @@
CmdArgs.push_back("--mrelax-relocations");
if (UseNoExecStack)
CmdArgs.push_back("-mnoexecstack");
+ if (UseGenerateMissingBuildNotes)
+ CmdArgs.push_back("-massembler-generate-missing-build-notes");
if (MipsTargetFeature != nullptr) {
CmdArgs.push_back("-target-feature");
CmdArgs.push_back(MipsTargetFeature);
Index: clang/lib/CodeGen/BackendUtil.cpp
===================================================================
--- clang/lib/CodeGen/BackendUtil.cpp
+++ clang/lib/CodeGen/BackendUtil.cpp
@@ -529,6 +529,8 @@
CodeGenOpts.IncrementalLinkerCompatible;
Options.MCOptions.MCFatalWarnings = CodeGenOpts.FatalWarnings;
Options.MCOptions.MCNoWarn = CodeGenOpts.NoWarn;
+ Options.MCOptions.MCGenerateMissingBuildNotes =
+ CodeGenOpts.GenerateMissingBuildNotes;
Options.MCOptions.AsmVerbose = CodeGenOpts.AsmVerbose;
Options.MCOptions.PreserveAsmComments = CodeGenOpts.PreserveAsmComments;
Options.MCOptions.ABIName = TargetOpts.ABI;
Index: clang/include/clang/Driver/Options.td
===================================================================
--- clang/include/clang/Driver/Options.td
+++ clang/include/clang/Driver/Options.td
@@ -3674,6 +3674,8 @@
HelpText<"Mark the file as not needing an executable stack">;
def massembler_no_warn : Flag<["-"], "massembler-no-warn">,
HelpText<"Make assembler not emit warnings">;
+def massembler_generate_missing_build_notes : Flag<["-"], "massembler-generate-missing-build-notes">,
+ HelpText<"Make assembler emit missing GNU build notes">;
def massembler_fatal_warnings : Flag<["-"], "massembler-fatal-warnings">,
HelpText<"Make assembler warnings fatal">;
def mrelax_relocations : Flag<["--"], "mrelax-relocations">,
Index: clang/include/clang/Basic/CodeGenOptions.def
===================================================================
--- clang/include/clang/Basic/CodeGenOptions.def
+++ clang/include/clang/Basic/CodeGenOptions.def
@@ -153,6 +153,7 @@
CODEGENOPT(FatalWarnings , 1, 0) ///< Set when -Wa,--fatal-warnings is
///< enabled.
CODEGENOPT(NoWarn , 1, 0) ///< Set when -Wa,--no-warn is enabled.
+CODEGENOPT(GenerateMissingBuildNotes, 1, 0) ///< Set when -Wa,--generate-missing-build-notes=yes is passed
CODEGENOPT(EnableSegmentedStacks , 1, 0) ///< Set when -fsplit-stack is enabled.
CODEGENOPT(NoInlineLineTables, 1, 0) ///< Whether debug info should contain
///< inline line tables.
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