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CodeGen: support an extension to pass linker options on ELF

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Introduce an extension to support passing linker options to the linker.
These would be ignored by older linkers, but newer linkers which support
this feature would be able to process the linker.

Emit a special discarded section `.linker-option`.  The content of this
section is a pair of strings (key, value).  The key is a type identifier for
the parameter.  This allows for an argument free parameter that will be
processed by the linker with the value being the parameter.  As an example,
`lib` identifies a library to be linked against, traditionally the `-l`
argument for Unix-based linkers with the parameter being the library name.

Thanks to James Henderson, Cary Coutant, Rafael Espinolda, Sean Silva
for the valuable discussion on the design of this feature.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@323783 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Saleem Abdulrasool
2018-01-30 16:29:29 +00:00
parent 4f30de8d0a
commit e7676fec11
13 changed files with 185 additions and 37 deletions
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lib/CodeGen/TargetLoweringObjectFileImpl.cpp
+18 -1
View File
@@ -93,6 +93,24 @@ static void GetObjCImageInfo(Module &M, unsigned &Version, unsigned &Flags,
void TargetLoweringObjectFileELF::emitModuleMetadata(
MCStreamer &Streamer, Module &M, const TargetMachine &TM) const {
auto &C = getContext();
if (NamedMDNode *LinkerOptions = M.getNamedMetadata("llvm.linker.options")) {
auto *S = C.getELFSection(".linker-options", ELF::SHT_LLVM_LINKER_OPTIONS,
ELF::SHF_EXCLUDE);
Streamer.SwitchSection(S);
for (const auto &Operand : LinkerOptions->operands()) {
if (cast<MDNode>(Operand)->getNumOperands() != 2)
report_fatal_error("invalid llvm.linker.options");
for (const auto &Option : cast<MDNode>(Operand)->operands()) {
Streamer.EmitBytes(cast<MDString>(Option)->getString());
Streamer.EmitIntValue(0, 1);
}
}
}
unsigned Version = 0;
unsigned Flags = 0;
StringRef Section;
@@ -101,7 +119,6 @@ void TargetLoweringObjectFileELF::emitModuleMetadata(
if (Section.empty())
return;
auto &C = getContext();
auto *S = C.getELFSection(Section, ELF::SHT_PROGBITS, ELF::SHF_ALLOC);
Streamer.SwitchSection(S);
Streamer.EmitLabel(C.getOrCreateSymbol(StringRef("OBJC_IMAGE_INFO")));