Index: lib/profile/CMakeLists.txt
===================================================================
--- lib/profile/CMakeLists.txt
+++ lib/profile/CMakeLists.txt
@@ -48,6 +48,7 @@
   InstrProfilingFile.c
   InstrProfilingMerge.c
   InstrProfilingMergeFile.c
+  InstrProfilingNameVar.c
   InstrProfilingWriter.c
   InstrProfilingPlatformDarwin.c
   InstrProfilingPlatformLinux.c
Index: lib/profile/InstrProfiling.c
===================================================================
--- lib/profile/InstrProfiling.c
+++ lib/profile/InstrProfiling.c
@@ -19,8 +19,6 @@
 
 COMPILER_RT_WEAK uint64_t INSTR_PROF_RAW_VERSION_VAR = INSTR_PROF_RAW_VERSION;
 
-COMPILER_RT_WEAK char INSTR_PROF_PROFILE_NAME_VAR[1] = {0};
-
 COMPILER_RT_VISIBILITY uint64_t __llvm_profile_get_magic(void) {
   return sizeof(void *) == sizeof(uint64_t) ? (INSTR_PROF_RAW_MAGIC_64)
                                             : (INSTR_PROF_RAW_MAGIC_32);
Index: lib/profile/InstrProfilingNameVar.c
===================================================================
--- /dev/null
+++ lib/profile/InstrProfilingNameVar.c
@@ -0,0 +1,18 @@
+//===- InstrProfilingNameVar.c - profile name variable setup --------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "InstrProfiling.h"
+
+/* char __llvm_profile_filename[1]
+ *
+ * The runtime should only provide its own definition of this symbol when the
+ * user has not specified one. Set this up by moving the runtime's copy of this
+ * symbol to an object file within the archive.
+ */
+COMPILER_RT_WEAK char INSTR_PROF_PROFILE_NAME_VAR[1] = {0};
Index: test/profile/instrprof-override-filename.c
===================================================================
--- test/profile/instrprof-override-filename.c
+++ test/profile/instrprof-override-filename.c
@@ -1,14 +1,24 @@
-// RUN: %clang_profgen=%t.profraw -o %t -O3 %s
-// RUN: %run %t %t.profraw
-// RUN: llvm-profdata merge -o %t.profdata %t.profraw
-// RUN: %clang_profuse=%t.profdata -o - -S -emit-llvm %s | FileCheck %s
+// RUN: rm -rf %t.dir && mkdir -p %t.dir
+// RUN: cd %t.dir
+//
+// RUN: %clang_profgen=P_RAW -o %t -O3 %s
+// RUN: %run %t P_RAW
+// RUN: llvm-profdata merge -o %t.profdata P_RAW
+// RUN: %clang_profuse=%t.profdata -o - -S -emit-llvm %s | FileCheck %s --check-prefix=FE
+//
+// RUN: %clang_pgogen=I_RAW -o %t.2 -O3 %s
+// RUN: %run %t.2 I_RAW
+// RUN: llvm-profdata merge -o %t2.profdata I_RAW
+//
+// FIXME: IRPGO states that there is a hash mismatch in main, and does not produce
+// branch weight metadata: %clang_profuse=%t2.profdata -o - -S -emit-llvm %s 
 
 void bar() {}
 int main(int argc, const char *argv[]) {
-  // CHECK: br i1 %{{.*}}, label %{{.*}}, label %{{.*}}, !prof ![[PD1:[0-9]+]]
+  // FE: br i1 %{{.*}}, label %{{.*}}, label %{{.*}}, !prof ![[PD1:[0-9]+]]
   if (argc < 2)
     return 1;
   bar();
   return 0;
 }
-// CHECK: ![[PD1]] = !{!"branch_weights", i32 1, i32 2}
+// FE: ![[PD1]] = !{!"branch_weights", i32 1, i32 2}