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[lto] add getLinkerOpts()

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Summary: Some compilers, including MSVC and Clang, allow linker options to be specified in source files. In the legacy LTO API, there is a getLinkerOpts() method that returns linker options for the bitcode module being processed. This change adds that method to the new API, so that the COFF linker can get the right linker options when using the new LTO API.

Reviewers: pcc, ruiu, mehdi_amini, tejohnson

Reviewed By: pcc

Differential Revision: https://reviews.llvm.org/D29207



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@293950 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bob Haarman
2017-02-02 23:00:49 +00:00
parent 5fcc26dee3
commit ea59150166
4 changed files with 69 additions and 29 deletions
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lib/CodeGen/TargetLoweringObjectFileImpl.cpp
+32 -29
View File
@@ -919,6 +919,37 @@ static int getSelectionForCOFF(const GlobalValue *GV) {
return 0;
}
void llvm::emitLinkerFlagsForGlobalCOFF(raw_ostream &OS, const GlobalValue *GV,
const Triple &TT, Mangler &Mangler) {
if (!GV->hasDLLExportStorageClass() || GV->isDeclaration())
return;
if (TT.isKnownWindowsMSVCEnvironment())
OS << " /EXPORT:";
else
OS << " -export:";
if (TT.isWindowsGNUEnvironment() || TT.isWindowsCygwinEnvironment()) {
std::string Flag;
raw_string_ostream FlagOS(Flag);
Mangler.getNameWithPrefix(FlagOS, GV, false);
FlagOS.flush();
if (Flag[0] == GV->getParent()->getDataLayout().getGlobalPrefix())
OS << Flag.substr(1);
else
OS << Flag;
} else {
Mangler.getNameWithPrefix(OS, GV, false);
}
if (!GV->getValueType()->isFunctionTy()) {
if (TT.isKnownWindowsMSVCEnvironment())
OS << ",DATA";
else
OS << ",data";
}
}
MCSection *TargetLoweringObjectFileCOFF::getExplicitSectionGlobal(
const GlobalObject *GO, SectionKind Kind, const TargetMachine &TM) const {
int Selection = 0;
@@ -1122,33 +1153,5 @@ MCSection *TargetLoweringObjectFileCOFF::getStaticDtorSection(
void TargetLoweringObjectFileCOFF::emitLinkerFlagsForGlobal(
raw_ostream &OS, const GlobalValue *GV) const {
if (!GV->hasDLLExportStorageClass() || GV->isDeclaration())
return;
const Triple &TT = getTargetTriple();
if (TT.isKnownWindowsMSVCEnvironment())
OS << " /EXPORT:";
else
OS << " -export:";
if (TT.isWindowsGNUEnvironment() || TT.isWindowsCygwinEnvironment()) {
std::string Flag;
raw_string_ostream FlagOS(Flag);
getMangler().getNameWithPrefix(FlagOS, GV, false);
FlagOS.flush();
if (Flag[0] == GV->getParent()->getDataLayout().getGlobalPrefix())
OS << Flag.substr(1);
else
OS << Flag;
} else {
getMangler().getNameWithPrefix(OS, GV, false);
}
if (!GV->getValueType()->isFunctionTy()) {
if (TT.isKnownWindowsMSVCEnvironment())
OS << ",DATA";
else
OS << ",data";
}
emitLinkerFlagsForGlobalCOFF(OS, GV, getTargetTriple(), getMangler());
}