[ELF][HEXAGON] Let input determine e_flag.

Differential Revision: https://reviews.llvm.org/D53204

llvm-svn: 344518

lld/ELF/Arch/Hexagon.cpp

@@ -55,8 +55,19 @@ Hexagon::Hexagon() {
   NoneRel = R_HEX_NONE;
 }
 
-// Support V60 only at the moment.
-uint32_t Hexagon::calcEFlags() const { return 0x60; }
+uint32_t Hexagon::calcEFlags() const {
+  assert(!ObjectFiles.empty());
+
+  // The architecture revision must always be equal to or greater than
+  // greatest revision in the list of inputs.
+  uint32_t Ret = 0;
+  for (InputFile *F : ObjectFiles) {
+    uint32_t EFlags = cast<ObjFile<ELF32LE>>(F)->getObj().getHeader()->e_flags;
+    if (EFlags > Ret)
+      Ret = EFlags;
+  }
+  return Ret;
+}
 
 static uint32_t applyMask(uint32_t Mask, uint32_t Data) {
   uint32_t Result = 0;

lld/test/ELF/hexagon-eflag.s

@@ -0,0 +1,7 @@
+# REQUIRES: hexagon
+# RUN: llvm-mc -filetype=obj -mv62 -triple=hexagon-unknown-elf %s -o %t
+# RUN: llvm-mc -filetype=obj -mv60 -triple=hexagon-unknown-elf %S/Inputs/hexagon.s -o %t2
+# RUN: ld.lld %t2 %t  -o %t3
+# RUN: llvm-readelf -h  %t3 | FileCheck %s
+# Verify that the largest arch in the input list is selected.
+# CHECK: Flags: 0x62