diff --git a/llvm/cmake/modules/HandleLLVMOptions.cmake b/llvm/cmake/modules/HandleLLVMOptions.cmake
--- a/llvm/cmake/modules/HandleLLVMOptions.cmake
+++ b/llvm/cmake/modules/HandleLLVMOptions.cmake
@@ -229,10 +229,10 @@
 if( LLVM_USE_LINKER )
   set(OLD_CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS})
   set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -fuse-ld=${LLVM_USE_LINKER}")
-  check_cxx_source_compiles("int main() { return 0; }" CXX_SUPPORTS_CUSTOM_LINKER)
-  if ( NOT CXX_SUPPORTS_CUSTOM_LINKER )
-	  message(FATAL_ERROR "Host compiler does not support '-fuse-ld=${LLVM_USE_LINKER}'")
-  endif()
+  #check_cxx_source_compiles("int main() { return 0; }" CXX_SUPPORTS_CUSTOM_LINKER)
+  #if ( NOT CXX_SUPPORTS_CUSTOM_LINKER )
+		#message(FATAL_ERROR "Host compiler does not support '-fuse-ld=${LLVM_USE_LINKER}'")
+  #endif()
   set(CMAKE_REQUIRED_FLAGS ${OLD_CMAKE_REQUIRED_FLAGS})
   append("-fuse-ld=${LLVM_USE_LINKER}"
     CMAKE_EXE_LINKER_FLAGS CMAKE_MODULE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS)
diff --git a/llvm/include/llvm/Analysis/LazyCallGraph.h b/llvm/include/llvm/Analysis/LazyCallGraph.h
--- a/llvm/include/llvm/Analysis/LazyCallGraph.h
+++ b/llvm/include/llvm/Analysis/LazyCallGraph.h
@@ -1082,12 +1082,21 @@
         continue;
       }
 
+      // The blockaddress constant expression is a weird special case, we can't
+      // generically walk its operands the way we do for all other constants.
       if (BlockAddress *BA = dyn_cast<BlockAddress>(C)) {
-        // The blockaddress constant expression is a weird special case, we
-        // can't generically walk its operands the way we do for all other
-        // constants.
+        bool AllUsersAreSameFn = true;
+        for (User *U : BA->users())
+          if (Instruction *I = dyn_cast<Instruction>(U))
+            if (I->getFunction() != BA->getFunction()) {
+              AllUsersAreSameFn = false;
+              break;
+            }
         if (Visited.insert(BA->getFunction()).second)
-          Worklist.push_back(BA->getFunction());
+          // If the blockaddress' function it refers to is a function it's not
+          // defined within, visit the other function.
+          if (!AllUsersAreSameFn)
+            Worklist.push_back(BA->getFunction());
         continue;
       }
 
diff --git a/llvm/lib/Analysis/InlineCost.cpp b/llvm/lib/Analysis/InlineCost.cpp
--- a/llvm/lib/Analysis/InlineCost.cpp
+++ b/llvm/lib/Analysis/InlineCost.cpp
@@ -1826,14 +1826,17 @@
     if (BB->empty())
       continue;
 
-    // Disallow inlining a blockaddress. A blockaddress only has defined
-    // behavior for an indirect branch in the same function, and we do not
-    // currently support inlining indirect branches. But, the inliner may not
-    // see an indirect branch that ends up being dead code at a particular call
-    // site. If the blockaddress escapes the function, e.g., via a global
-    // variable, inlining may lead to an invalid cross-function reference.
+    // Disallow inlining a blockaddress with uses other than strictly callbr.
+    // A blockaddress only has defined behavior for an indirect branch in the
+    // same function, and we do not currently support inlining indirect
+    // branches.  But, the inliner may not see an indirect branch that ends up
+    // being dead code at a particular call site. If the blockaddress escapes
+    // the function, e.g., via a global variable, inlining may lead to an
+    // invalid cross-function reference.
     if (BB->hasAddressTaken())
-      return "blockaddress";
+      for (User *U : BlockAddress::get(&*BB)->users())
+        if (!isa<CallBrInst>(*U))
+          return "blockaddress used outside of callbr";
 
     // Analyze the cost of this block. If we blow through the threshold, this
     // returns false, and we can bail on out.
@@ -2077,13 +2080,15 @@
 InlineResult llvm::isInlineViable(Function &F) {
   bool ReturnsTwice = F.hasFnAttribute(Attribute::ReturnsTwice);
   for (Function::iterator BI = F.begin(), BE = F.end(); BI != BE; ++BI) {
-    // Disallow inlining of functions which contain indirect branches or
-    // blockaddresses.
+    // Disallow inlining of functions which contain indirect branches.
     if (isa<IndirectBrInst>(BI->getTerminator()))
       return "contains indirect branches";
 
+    // Disallow inlining of blockaddresses whose sole users are not callbr's.
     if (BI->hasAddressTaken())
-      return "uses block address";
+      for (User *U : BlockAddress::get(&*BI)->users())
+        if (!isa<CallBrInst>(*U))
+          return "blockaddress used outside of callbr";
 
     for (auto &II : *BI) {
       CallSite CS(&II);
diff --git a/llvm/test/Transforms/Inline/callbr.ll b/llvm/test/Transforms/Inline/callbr.ll
new file mode 100644
--- /dev/null
+++ b/llvm/test/Transforms/Inline/callbr.ll
@@ -0,0 +1,54 @@
+; RUN: opt -inline -S < %s | FileCheck %s
+; RUN: opt -passes='cgscc(inline)' -S < %s | FileCheck %s
+
+define dso_local i32 @main() #0 {
+  %1 = alloca i32, align 4
+  store i32 0, i32* %1, align 4
+  %2 = call i32 @t32(i32 0)
+  ret i32 %2
+}
+
+define internal i32 @t32(i32) #0 {
+  %2 = alloca i32, align 4
+  %3 = alloca i32, align 4
+  store i32 %0, i32* %3, align 4
+  %4 = load i32, i32* %3, align 4
+  callbr void asm sideeffect "testl $0, $0; jne ${1:l};", "r,X,X,~{dirflag},~{fpsr},~{flags}"(i32 %4, i8* blockaddress(@t32, %7), i8* blockaddress(@t32, %6)) #1
+          to label %5 [label %7, label %6]
+
+; <label>:5:                                      ; preds = %1
+  store i32 0, i32* %2, align 4
+  br label %8
+
+; <label>:6:                                      ; preds = %1
+  store i32 1, i32* %2, align 4
+  br label %8
+
+; <label>:7:                                      ; preds = %1
+  store i32 2, i32* %2, align 4
+  br label %8
+
+; <label>:8:                                      ; preds = %7, %6, %5
+  %9 = load i32, i32* %2, align 4
+  ret i32 %9
+}
+
+; Check that @t32 no longer exists after inlining, as it has now been inlined
+; into @main.
+
+; CHECK-NOT: @t32
+; CHECK: define dso_local i32 @main
+; CHECK: callbr void asm sideeffect "testl $0, $0; jne ${1:l};", "r,X,X,~{dirflag},~{fpsr},~{flags}"(i32 %6, i8* blockaddress(@main, %9), i8* blockaddress(@main, %8))
+; CHECK: to label %7 [label %9, label %8]
+; CHECK: 7:
+; CHECK-NEXT: store i32 0, i32* %1, align 4
+; CHECK-NEXT: br label %t32.exit
+; CHECK: 8:
+; CHECK-NEXT: store i32 1, i32* %1, align 4
+; CHECK-NEXT: br label %t32.exit
+; CHECK: 9:
+; CHECK-NEXT: store i32 2, i32* %1, align 4
+; CHECK-NEXT: br label %t32.exit
+; CHECK: t32.exit:
+; CHECK-NEXT: %10 = load i32, i32* %1, align 4
+; CHECK: ret i32 %10