Subzero: Emit ARM build-attributes in the file scope (as header).

src/IceGlobalContext.cpp

Index: src/IceGlobalContext.cpp
diff --git a/src/IceGlobalContext.cpp b/src/IceGlobalContext.cpp
index 8de57f3030fd4d3ace4e789030ef48123acb5df3..b5fc4f0545d6732b2df4c6adc25eaa52f98dde33 100644
--- a/src/IceGlobalContext.cpp
+++ b/src/IceGlobalContext.cpp
@@ -342,6 +342,17 @@ void resizePending(std::vector<EmitterWorkItem *> &Pending, uint32_t Index) {
 
 } // end of anonymous namespace
 
+void GlobalContext::emitFileHeader() {
+  TimerMarker T1(Ice::TimerStack::TT_emit, this);
+  if (getFlags().getOutFileType() == FT_Elf) {
+    getObjectWriter()->writeInitialELFHeader();
+  } else {
+    if (!ALLOW_DUMP)
+      llvm::report_fatal_error("emitFileHeader for non-ELF");
+    TargetHeaderLowering::createLowering(this)->lower();

[jvoung (off chromium), 2015/06/05 22:05:54]

Or maybe the flag check and writeInitialELFHeader should happen in the
target-specific "lowering". To both write the ELF header and write the
attributes section.

+  }
+}
+
 void GlobalContext::emitItems() {
   const bool Threaded = !getFlags().isSequential();
   // Pending is a vector containing the reassembled, ordered list of