Index: lld/ELF/Driver.cpp
===================================================================
--- lld/ELF/Driver.cpp
+++ lld/ELF/Driver.cpp
@@ -856,8 +856,30 @@
   return ret;
 }
 
+// Return false iff the first line of symbol ordering file is "#
+// apply_if_output_is: <filename>", and `basename <filename>` does not equal to
+// `basename config->outputFile`.
+static bool shouldApplySymbolOrderingFile(MemoryBufferRef mb) {
+  StringRef buf = mb.getBuffer();
+  if (buf.empty() || buf[0] != '#')
+    return true;
+  size_t pos = buf.find_first_of('\n');
+  if (pos == StringRef::npos)
+    return true;
+  // "line" starts from the first non-space character after "#".
+  StringRef line = buf.substr(1, pos).trim();
+  if (line.consume_front("apply_if_output_is:")) {
+    // Remove any possible spaces betwee "apply_if_output_is:" and "<filename>".
+    StringRef filename = line.ltrim();
+    return path::filename(filename) == path::filename(config->outputFile);
+  }
+  return true;
+}
+
 // Parse the symbol ordering file and warn for any duplicate entries.
 static std::vector<StringRef> getSymbolOrderingFile(MemoryBufferRef mb) {
+  if (!shouldApplySymbolOrderingFile(mb))
+    return {};
   SetVector<StringRef> names;
   for (StringRef s : args::getLines(mb))
     if (!names.insert(s) && config->warnSymbolOrdering)
Index: lld/ELF/Options.td
===================================================================
--- lld/ELF/Options.td
+++ lld/ELF/Options.td
@@ -376,8 +376,13 @@
 
 def strip_debug: F<"strip-debug">, HelpText<"Strip debugging information">;
 
-defm symbol_ordering_file:
-  Eq<"symbol-ordering-file", "Layout sections to place symbols in the order specified by symbol ordering file">;
+defm symbol_ordering_file
+    : Eq<"symbol-ordering-file", "Layout sections to place symbols in the "
+                                 "order specified by symbol ordering file, "
+                                 "an optional \"# apply_if_output_is: "
+                                 "<filename>\" can be specified at the "
+                                 "beginning to mean this file is only to be "
+                                 "used when linking <filename>">;
 
 defm sysroot: Eq<"sysroot", "Set the system root">;
 
Index: lld/test/ELF/symbol-ordering-file-apply-if-output-is.s
===================================================================
--- /dev/null
+++ lld/test/ELF/symbol-ordering-file-apply-if-output-is.s
@@ -0,0 +1,38 @@
+# REQUIRES: x86
+# RUN: llvm-mc -filetype=obj -triple=x86_64-pc-linux %s -o %t.o
+# RUN: echo "_foo2" > %t_order.txt
+# RUN: echo "_foo1" >> %t_order.txt
+
+# RUN: ld.lld --symbol-ordering-file %t_order.txt %t.o -o %t2.out
+# RUN: llvm-objdump -s %t2.out| FileCheck %s --check-prefix=ORDER_FILE
+
+# ORDER_FILE:      Contents of section .foo:
+# ORDER_FILE-NEXT:  2211
+
+# RUN: echo "# apply_if_output_is: dummy_file_name_no_match" > %t_order.txt
+# RUN: echo "_foo2" >> %t_order.txt
+# RUN: echo "_foo1" >> %t_order.txt
+
+# RUN: ld.lld --symbol-ordering-file %t_order.txt %t.o -o %t2.out
+# RUN: llvm-objdump -s %t2.out| FileCheck %s --check-prefix=ORDER_FILE_WITH_APPLY
+
+# ORDER_FILE_WITH_APPLY:      Contents of section .foo:
+# ORDER_FILE_WITH_APPLY-NEXT:  1122
+
+# RUN: echo "# apply_if_output_is: %t2.out" > %t_order.txt
+# RUN: echo "_foo2" >> %t_order.txt
+# RUN: echo "_foo1" >> %t_order.txt
+
+# RUN: ld.lld --symbol-ordering-file %t_order.txt %t.o -o %t2.out
+# RUN: llvm-objdump -s %t2.out| FileCheck %s --check-prefix=ORDER_FILE_WITH_APPLY2
+
+# ORDER_FILE_WITH_APPLY2:      Contents of section .foo:
+# ORDER_FILE_WITH_APPLY2-NEXT:  2211
+
+.section .foo,"ax",@progbits,unique,1
+_foo1:
+ .byte 0x11
+
+.section .foo,"ax",@progbits,unique,2
+_foo2:
+ .byte 0x22