1 files changed, 18 insertions, 2 deletions
diff --git a/llvm/lib/Object/ArchiveWriter.cpp b/llvm/lib/Object/ArchiveWriter.cpp
index 6fc0889..a112597 100644
--- a/llvm/lib/Object/ArchiveWriter.cpp
+++ b/llvm/lib/Object/ArchiveWriter.cpp
@@ -1119,10 +1119,26 @@ Error writeArchiveToStream(raw_ostream &Out,
     // to switch to 64-bit. Note that the file can be larger than 4GB as long as
     // the last member starts before the 4GB offset.
     if (*HeadersSize + LastMemberHeaderOffset >= Sym64Threshold) {
-      if (Kind == object::Archive::K_DARWIN)
+      switch (Kind) {
+      case object::Archive::K_COFF:
+        // COFF format has no 64-bit version, so we use GNU64 instead.
+        if (!SymMap.Map.empty() && !SymMap.ECMap.empty())
+          // Only the COFF format supports the ECSYMBOLS section, so don’t use
+          // GNU64 when two symbol maps are required.
+          return make_error<object::GenericBinaryError>(
+              "Archive is too large: ARM64X does not support archives larger "
+              "than 4GB");
+        // Since this changes the headers, we need to recalculate everything.
+        return writeArchiveToStream(Out, NewMembers, WriteSymtab,
+                                    object::Archive::K_GNU64, Deterministic,
+                                    Thin, IsEC, Warn);
+      case object::Archive::K_DARWIN:
         Kind = object::Archive::K_DARWIN64;
-      else
+        break;
+      default:
         Kind = object::Archive::K_GNU64;
+        break;
+      }
       HeadersSize.reset();
     }
   }