diff --git a/llvm/test/tools/UpdateTestChecks/update_cc_test_checks/Inputs/def-and-decl.c b/llvm/test/tools/UpdateTestChecks/update_cc_test_checks/Inputs/def-and-decl.c
new file mode 100644
--- /dev/null
+++ b/llvm/test/tools/UpdateTestChecks/update_cc_test_checks/Inputs/def-and-decl.c
@@ -0,0 +1,17 @@
+// Check that the CHECK lines are generated before the definition and not the declaration
+// RUN: %clang_cc1 -triple x86_64-unknown-linux-gnu %s -emit-llvm -o - | FileCheck %s
+
+int foo();
+
+void empty_function();
+
+int main() {
+  empty_function();
+  return foo();
+}
+
+int foo() {
+  return 1;
+}
+
+void empty_function() {}
diff --git a/llvm/test/tools/UpdateTestChecks/update_cc_test_checks/Inputs/def-and-decl.c.expected b/llvm/test/tools/UpdateTestChecks/update_cc_test_checks/Inputs/def-and-decl.c.expected
new file mode 100644
--- /dev/null
+++ b/llvm/test/tools/UpdateTestChecks/update_cc_test_checks/Inputs/def-and-decl.c.expected
@@ -0,0 +1,34 @@
+// NOTE: Assertions have been autogenerated by utils/update_cc_test_checks.py
+// Check that the CHECK lines are generated before the definition and not the declaration
+// RUN: %clang_cc1 -triple x86_64-unknown-linux-gnu %s -emit-llvm -o - | FileCheck %s
+
+int foo();
+
+void empty_function();
+
+// CHECK-LABEL: @main(
+// CHECK-NEXT:  entry:
+// CHECK-NEXT:    [[RETVAL:%.*]] = alloca i32, align 4
+// CHECK-NEXT:    store i32 0, i32* [[RETVAL]], align 4
+// CHECK-NEXT:    call void @empty_function()
+// CHECK-NEXT:    [[CALL:%.*]] = call i32 @foo()
+// CHECK-NEXT:    ret i32 [[CALL]]
+//
+int main() {
+  empty_function();
+  return foo();
+}
+
+// CHECK-LABEL: @foo(
+// CHECK-NEXT:  entry:
+// CHECK-NEXT:    ret i32 1
+//
+int foo() {
+  return 1;
+}
+
+// CHECK-LABEL: @empty_function(
+// CHECK-NEXT:  entry:
+// CHECK-NEXT:    ret void
+//
+void empty_function() {}
diff --git a/llvm/test/tools/UpdateTestChecks/update_cc_test_checks/def-and-decl.test b/llvm/test/tools/UpdateTestChecks/update_cc_test_checks/def-and-decl.test
new file mode 100644
--- /dev/null
+++ b/llvm/test/tools/UpdateTestChecks/update_cc_test_checks/def-and-decl.test
@@ -0,0 +1,7 @@
+## Test that CHECK lines are generated before the definion and not the declaration
+
+# RUN: cp %S/Inputs/def-and-decl.c %t.c && %update_cc_test_checks %t.c
+# RUN: diff -u %S/Inputs/def-and-decl.c.expected %t.c
+## Check that re-running update_cc_test_checks doesn't change the output
+# RUN: %update_cc_test_checks %t.c
+# RUN: diff -u %S/Inputs/def-and-decl.c.expected %t.c
diff --git a/llvm/utils/update_cc_test_checks.py b/llvm/utils/update_cc_test_checks.py
--- a/llvm/utils/update_cc_test_checks.py
+++ b/llvm/utils/update_cc_test_checks.py
@@ -76,6 +76,10 @@
     if line is None:
       common.debug('Skipping function without line number:', node['name'], '@', node['loc'])
       return
+    # If there is no 'inner' object, it is a function declaration -> skip
+    if 'inner' not in node:
+      common.debug('Skipping function without body:', node['name'], '@', node['loc'])
+      return
     spell = node['name']
     mangled = node.get('mangledName', spell)
     ret[int(line)-1] = (spell, mangled)