diff --git a/clang/lib/CodeGen/CGCall.cpp b/clang/lib/CodeGen/CGCall.cpp
--- a/clang/lib/CodeGen/CGCall.cpp
+++ b/clang/lib/CodeGen/CGCall.cpp
@@ -4841,6 +4841,10 @@
   } else {
     // Otherwise, nounwind call sites will never throw.
     CannotThrow = Attrs.hasFnAttribute(llvm::Attribute::NoUnwind);
+
+    if (auto *FPtr = dyn_cast<llvm::Function>(CalleePtr))
+      if (FPtr->hasFnAttribute(llvm::Attribute::NoUnwind))
+        CannotThrow = true;
   }
 
   // If we made a temporary, be sure to clean up after ourselves. Note that we
diff --git a/clang/test/CodeGenCXX/debug-info-class.cpp b/clang/test/CodeGenCXX/debug-info-class.cpp
--- a/clang/test/CodeGenCXX/debug-info-class.cpp
+++ b/clang/test/CodeGenCXX/debug-info-class.cpp
@@ -13,7 +13,7 @@
   virtual ~B();
 };
 
-B::~B() {
+B::~B() { extern void mayThrow(); mayThrow();
 }
 
 struct C {
diff --git a/clang/test/CodeGenObjCXX/arc-list-init-destruct.mm b/clang/test/CodeGenObjCXX/arc-list-init-destruct.mm
--- a/clang/test/CodeGenObjCXX/arc-list-init-destruct.mm
+++ b/clang/test/CodeGenObjCXX/arc-list-init-destruct.mm
@@ -16,6 +16,8 @@
 };
 
 bool getBool() {
+  extern void mayThrow();
+  mayThrow();
   return false;
 }
 
diff --git a/clang/test/CodeGenObjCXX/os_log.mm b/clang/test/CodeGenObjCXX/os_log.mm
--- a/clang/test/CodeGenObjCXX/os_log.mm
+++ b/clang/test/CodeGenObjCXX/os_log.mm
@@ -6,13 +6,14 @@
   void release(int *lock);
 
   // CHECK-LABEL: define {{.*}} @_ZN13no_eh_cleanup3logERiPcS1_(
+  // CHECK: call void @__os_log_helper_1_2_2_4_0_8_34(
+
   void log(int &i, char *data, char *buf) {
       int lock __attribute__((cleanup(release)));
       __builtin_os_log_format(buf, "%d %{public}s", i, data);
   }
 
-  // An `invoke` of a `nounwind` callee is simplified to a direct
-  // call by an optimization in llvm. Just check that we emit `nounwind`.
+  // Check that the os_log_helper is marked `nounwind`.
   // CHECK: define {{.*}} @__os_log_helper_1_2_2_4_0_8_34({{.*}} [[NUW:#[0-9]+]]
 }
 
diff --git a/clang/test/OpenMP/atomic_codegen.cpp b/clang/test/OpenMP/atomic_codegen.cpp
--- a/clang/test/OpenMP/atomic_codegen.cpp
+++ b/clang/test/OpenMP/atomic_codegen.cpp
@@ -82,7 +82,7 @@
     }
 }
 
-int &foo() { return a; }
+int &foo() { extern void mayThrow(); mayThrow(); return a; }
 
 // TERM_DEBUG-LABEL: parallel_atomic
 void parallel_atomic() {
diff --git a/clang/test/OpenMP/critical_codegen.cpp b/clang/test/OpenMP/critical_codegen.cpp
--- a/clang/test/OpenMP/critical_codegen.cpp
+++ b/clang/test/OpenMP/critical_codegen.cpp
@@ -22,7 +22,7 @@
 
 // ALL:       define {{.*}}void [[FOO:@.+]]()
 
-void foo() {}
+void foo() { extern void mayThrow(); mayThrow(); }
 
 // ALL-LABEL: @main
 // TERM_DEBUG-LABEL: @main
diff --git a/clang/test/OpenMP/distribute_parallel_for_num_threads_codegen.cpp b/clang/test/OpenMP/distribute_parallel_for_num_threads_codegen.cpp
--- a/clang/test/OpenMP/distribute_parallel_for_num_threads_codegen.cpp
+++ b/clang/test/OpenMP/distribute_parallel_for_num_threads_codegen.cpp
@@ -22,7 +22,7 @@
 struct S {
   intptr_t a, b, c;
   S(intptr_t a) : a(a) {}
-  operator char() { return a; }
+  operator char() { extern void mayThrow(); mayThrow(); return a; }
   ~S() {}
 };
 
diff --git a/clang/test/OpenMP/distribute_parallel_for_simd_num_threads_codegen.cpp b/clang/test/OpenMP/distribute_parallel_for_simd_num_threads_codegen.cpp
--- a/clang/test/OpenMP/distribute_parallel_for_simd_num_threads_codegen.cpp
+++ b/clang/test/OpenMP/distribute_parallel_for_simd_num_threads_codegen.cpp
@@ -22,7 +22,7 @@
 struct S {
   intptr_t a, b, c;
   S(intptr_t a) : a(a) {}
-  operator char() { return a; }
+  operator char() {  extern void mayThrow(); mayThrow(); return a; }
   ~S() {}
 };
 
diff --git a/clang/test/OpenMP/for_codegen.cpp b/clang/test/OpenMP/for_codegen.cpp
--- a/clang/test/OpenMP/for_codegen.cpp
+++ b/clang/test/OpenMP/for_codegen.cpp
@@ -536,7 +536,7 @@
 }
 
 // TERM_DEBUG-LABEL: foo
-int foo() {return 0;};
+int foo() { extern void mayThrow(); mayThrow(); return 0;};
 
 // TERM_DEBUG-LABEL: parallel_for
 void parallel_for(float *a) {
diff --git a/clang/test/OpenMP/for_simd_codegen.cpp b/clang/test/OpenMP/for_simd_codegen.cpp
--- a/clang/test/OpenMP/for_simd_codegen.cpp
+++ b/clang/test/OpenMP/for_simd_codegen.cpp
@@ -20,7 +20,7 @@
 #ifndef HEADER
 #define HEADER
 
-long long get_val() { return 0; }
+long long get_val() { extern void mayThrow(); mayThrow(); return 0; }
 double *g_ptr;
 
 // CHECK-LABEL: define {{.*void}} @{{.*}}simple{{.*}}(float* {{.+}}, float* {{.+}}, float* {{.+}}, float* {{.+}})
@@ -785,7 +785,7 @@
 }
 
 // TERM_DEBUG-LABEL: bar
-int bar() {return 0;};
+int bar() { extern void mayThrow(); mayThrow(); return 0; };
 
 // TERM_DEBUG-LABEL: parallel_simd
 void parallel_simd(float *a) {
diff --git a/clang/test/OpenMP/master_codegen.cpp b/clang/test/OpenMP/master_codegen.cpp
--- a/clang/test/OpenMP/master_codegen.cpp
+++ b/clang/test/OpenMP/master_codegen.cpp
@@ -19,7 +19,7 @@
 
 // ALL:       define {{.*}}void [[FOO:@.+]]()
 
-void foo() {}
+void foo() { extern void mayThrow(); mayThrow(); }
 
 // ALL-LABEL: @main
 // TERM_DEBUG-LABEL: @main
diff --git a/clang/test/OpenMP/parallel_for_codegen.cpp b/clang/test/OpenMP/parallel_for_codegen.cpp
--- a/clang/test/OpenMP/parallel_for_codegen.cpp
+++ b/clang/test/OpenMP/parallel_for_codegen.cpp
@@ -372,7 +372,7 @@
 }
 
 // TERM_DEBUG-LABEL: foo
-int foo() {return 0;};
+int foo() { extern void mayThrow(); mayThrow(); return 0; };
 
 // TERM_DEBUG-LABEL: parallel_for
 // CLEANUP: parallel_for
diff --git a/clang/test/OpenMP/parallel_for_simd_codegen.cpp b/clang/test/OpenMP/parallel_for_simd_codegen.cpp
--- a/clang/test/OpenMP/parallel_for_simd_codegen.cpp
+++ b/clang/test/OpenMP/parallel_for_simd_codegen.cpp
@@ -22,7 +22,7 @@
 #ifndef HEADER
 #define HEADER
 
-long long get_val() { return 0; }
+long long get_val() { extern void mayThrow(); mayThrow(); return 0; }
 double *g_ptr;
 
 // CHECK-LABEL: define {{.*void}} @{{.*}}simple{{.*}}(float* {{.+}}, float* {{.+}}, float* {{.+}}, float* {{.+}})
@@ -801,7 +801,7 @@
 // OMP50-DAG: ![[NOVM]] = !{!"llvm.loop.vectorize.enable", i1 false}
 
 // TERM_DEBUG-LABEL: bar
-int bar() {return 0;};
+int bar() { extern void mayThrow(); mayThrow(); return 0; };
 
 // TERM_DEBUG-LABEL: parallel_simd
 void parallel_simd(float *a) {
diff --git a/clang/test/OpenMP/parallel_master_codegen.cpp b/clang/test/OpenMP/parallel_master_codegen.cpp
--- a/clang/test/OpenMP/parallel_master_codegen.cpp
+++ b/clang/test/OpenMP/parallel_master_codegen.cpp
@@ -18,7 +18,7 @@
 // CK1-DAG: [[DEF_LOC:@.+]] = private unnamed_addr global %struct.ident_t { i32 0, i32 2, i32 0, i32 0, i8* getelementptr inbounds ([23 x i8], [23 x i8]* [[STR]], i32 0, i32 0) }
 
 // CK1-LABEL: foo
-void foo() {}
+void foo() { extern void mayThrow(); mayThrow(); }
 
 void parallel_master() {
 #pragma omp parallel master
diff --git a/clang/test/OpenMP/parallel_num_threads_codegen.cpp b/clang/test/OpenMP/parallel_num_threads_codegen.cpp
--- a/clang/test/OpenMP/parallel_num_threads_codegen.cpp
+++ b/clang/test/OpenMP/parallel_num_threads_codegen.cpp
@@ -22,7 +22,7 @@
 struct S {
   intptr_t a, b, c;
   S(intptr_t a) : a(a) {}
-  operator char() { return a; }
+  operator char() { extern void mayThrow(); mayThrow(); return a; }
   ~S() {}
 };
 
diff --git a/clang/test/OpenMP/parallel_sections_codegen.cpp b/clang/test/OpenMP/parallel_sections_codegen.cpp
--- a/clang/test/OpenMP/parallel_sections_codegen.cpp
+++ b/clang/test/OpenMP/parallel_sections_codegen.cpp
@@ -10,9 +10,9 @@
 #ifndef HEADER
 #define HEADER
 // CHECK-LABEL: foo
-void foo() {};
+void foo() { extern void mayThrow(); mayThrow(); };
 // CHECK-LABEL: bar
-void bar() {};
+void bar() { extern void mayThrow(); mayThrow(); };
 
 template <class T>
 T tmain() {
diff --git a/clang/test/OpenMP/sections_codegen.cpp b/clang/test/OpenMP/sections_codegen.cpp
--- a/clang/test/OpenMP/sections_codegen.cpp
+++ b/clang/test/OpenMP/sections_codegen.cpp
@@ -12,9 +12,9 @@
 // CHECK-DAG: [[IMPLICIT_BARRIER_SECTIONS_LOC:@.+]] = private unnamed_addr global %{{.+}} { i32 0, i32 194, i32 0, i32 0, i8*
 // CHECK-DAG: [[SECTIONS_LOC:@.+]] = private unnamed_addr global %{{.+}} { i32 0, i32 1026, i32 0, i32 0, i8*
 // CHECK-LABEL: foo
-void foo() {};
+void foo() { extern void mayThrow(); mayThrow(); };
 // CHECK-LABEL: bar
-void bar() {};
+void bar() { extern void mayThrow(); mayThrow(); };
 
 template <class T>
 T tmain() {
diff --git a/clang/test/OpenMP/simd_codegen.cpp b/clang/test/OpenMP/simd_codegen.cpp
--- a/clang/test/OpenMP/simd_codegen.cpp
+++ b/clang/test/OpenMP/simd_codegen.cpp
@@ -26,7 +26,7 @@
 // OMP50-DAG: [[LAST_IV:@.+]] = {{.*}}common global i64 0
 // OMP50-DAG: [[LAST_A:@.+]] = {{.*}}common global i32 0
 
-long long get_val() { return 0; }
+long long get_val() { extern void mayThrow(); mayThrow(); return 0; }
 double *g_ptr;
 
 struct S {
@@ -798,7 +798,7 @@
 
 #endif // OMP5
 // TERM_DEBUG-LABEL: bar
-int bar() {return 0;};
+int bar() { extern void mayThrow(); mayThrow(); return 0; };
 
 // TERM_DEBUG-LABEL: parallel_simd
 void parallel_simd(float *a) {
diff --git a/clang/test/OpenMP/single_codegen.cpp b/clang/test/OpenMP/single_codegen.cpp
--- a/clang/test/OpenMP/single_codegen.cpp
+++ b/clang/test/OpenMP/single_codegen.cpp
@@ -42,7 +42,7 @@
 TestClass tc2[2];
 #pragma omp threadprivate(tc, tc2)
 
-void foo() {}
+void foo() { extern void mayThrow(); mayThrow(); }
 
 struct SS {
   int a;
diff --git a/clang/test/OpenMP/taskgroup_codegen.cpp b/clang/test/OpenMP/taskgroup_codegen.cpp
--- a/clang/test/OpenMP/taskgroup_codegen.cpp
+++ b/clang/test/OpenMP/taskgroup_codegen.cpp
@@ -16,7 +16,7 @@
 
 // CHECK:       define {{.*}}void [[FOO:@.+]]()
 
-void foo() {}
+void foo() { extern void mayThrow(); mayThrow(); }
 
 // CHECK-LABEL: @main
 // TERM_DEBUG-LABEL: @main