[MC, COFF] Support link /incremental conditionally

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

2 files changed, 8 insertions, 7 deletions

diff --git a/llvm/lib/Target/ARM/MCTargetDesc/ARMMCTargetDesc.h b/llvm/lib/Target/ARM/MCTargetDesc/ARMMCTargetDesc.h
index fd30623d79a..c2bbc8e828c 100644
--- a/llvm/lib/Target/ARM/MCTargetDesc/ARMMCTargetDesc.h
+++ b/llvm/lib/Target/ARM/MCTargetDesc/ARMMCTargetDesc.h
@@ -86,7 +86,8 @@ MCAsmBackend *createThumbBEAsmBackend(const Target &T,
 // object file.
 MCStreamer *createARMWinCOFFStreamer(MCContext &Context, MCAsmBackend &MAB,
                                      raw_pwrite_stream &OS,
-                                     MCCodeEmitter *Emitter, bool RelaxAll);
+                                     MCCodeEmitter *Emitter, bool RelaxAll,
+                                     bool IncrementalLinkerCompatible);
 
 /// Construct an ELF Mach-O object writer.
 MCObjectWriter *createARMELFObjectWriter(raw_pwrite_stream &OS, uint8_t OSABI,
diff --git a/llvm/lib/Target/ARM/MCTargetDesc/ARMWinCOFFStreamer.cpp b/llvm/lib/Target/ARM/MCTargetDesc/ARMWinCOFFStreamer.cpp
index b993b1be484..83fa084e60c 100644
--- a/llvm/lib/Target/ARM/MCTargetDesc/ARMWinCOFFStreamer.cpp
+++ b/llvm/lib/Target/ARM/MCTargetDesc/ARMWinCOFFStreamer.cpp
@@ -37,11 +37,11 @@ void ARMWinCOFFStreamer::EmitThumbFunc(MCSymbol *Symbol) {
 }
 }
 
-MCStreamer *llvm::createARMWinCOFFStreamer(MCContext &Context,
-                                           MCAsmBackend &MAB,
-                                           raw_pwrite_stream &OS,
-                                           MCCodeEmitter *Emitter,
-                                           bool RelaxAll) {
-  return new ARMWinCOFFStreamer(Context, MAB, *Emitter, OS);
+MCStreamer *llvm::createARMWinCOFFStreamer(
+    MCContext &Context, MCAsmBackend &MAB, raw_pwrite_stream &OS,
+    MCCodeEmitter *Emitter, bool RelaxAll, bool IncrementalLinkerCompatible) {
+  auto *S = new ARMWinCOFFStreamer(Context, MAB, *Emitter, OS);
+  S->getAssembler().setIncrementalLinkerCompatible(IncrementalLinkerCompatible);
+  return S;
 }