[mc-coff] Forward Linker Option flags into the .drectve section
Summary:
This is modelled on the Mach-O linker options implementation and should
support a Clang implementation of #pragma comment(lib/linker).
Reviewers: rafael
CC: llvm-commits
Differential Revision: http://llvm-reviews.chandlerc.com/D724
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@180569 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/TargetLoweringObjectFileImpl.cpp b/lib/CodeGen/TargetLoweringObjectFileImpl.cpp
index 3bdca4c..678698a 100644
--- a/lib/CodeGen/TargetLoweringObjectFileImpl.cpp
+++ b/lib/CodeGen/TargetLoweringObjectFileImpl.cpp
@@ -782,3 +782,49 @@
return getDataSection();
}
+void TargetLoweringObjectFileCOFF::
+emitModuleFlags(MCStreamer &Streamer,
+ ArrayRef<Module::ModuleFlagEntry> ModuleFlags,
+ Mangler *Mang, const TargetMachine &TM) const {
+ MDNode *LinkerOptions = 0;
+
+ // Look for the "Linker Options" flag, since it's the only one we support.
+ for (ArrayRef<Module::ModuleFlagEntry>::iterator
+ i = ModuleFlags.begin(), e = ModuleFlags.end(); i != e; ++i) {
+ const Module::ModuleFlagEntry &MFE = *i;
+ StringRef Key = MFE.Key->getString();
+ Value *Val = MFE.Val;
+ if (Key == "Linker Options") {
+ LinkerOptions = cast<MDNode>(Val);
+ break;
+ }
+ }
+ if (!LinkerOptions)
+ return;
+
+ // Emit the linker options to the linker .drectve section. According to the
+ // spec, this section is a space-separated string containing flags for linker.
+ const MCSection *Sec = getDrectveSection();
+ Streamer.SwitchSection(Sec);
+ for (unsigned i = 0, e = LinkerOptions->getNumOperands(); i != e; ++i) {
+ MDNode *MDOptions = cast<MDNode>(LinkerOptions->getOperand(i));
+ for (unsigned ii = 0, ie = MDOptions->getNumOperands(); ii != ie; ++ii) {
+ MDString *MDOption = cast<MDString>(MDOptions->getOperand(ii));
+ StringRef Op = MDOption->getString();
+ // Lead with a space for consistency with our dllexport implementation.
+ std::string Escaped(" ");
+ if (Op.find(" ") != StringRef::npos) {
+ // The PE-COFF spec says args with spaces must be quoted. It doesn't say
+ // how to escape quotes, but it probably uses this algorithm:
+ // http://msdn.microsoft.com/en-us/library/17w5ykft(v=vs.85).aspx
+ // FIXME: Reuse escaping code from Support/Windows/Program.inc
+ Escaped.push_back('\"');
+ Escaped.append(Op);
+ Escaped.push_back('\"');
+ } else {
+ Escaped.append(Op);
+ }
+ Streamer.EmitBytes(Escaped);
+ }
+ }
+}