From 35f2c3a8b41fd3b6ef88d013a7c3ed9478b765e4 Mon Sep 17 00:00:00 2001
From: Chris Warner <cwarner@esri.com>
Date: Sun, 20 Dec 2020 11:11:27 +0000
Subject: [PATCH] [clang-tidy] cppcoreguidelines-pro-type-member-init: suppress
 warning for default member funcs

Modify the cppcoreguidelines-pro-type-member-init checker to ignore warnings from the move and copy-constructors when they are compiler defined with `= default` outside of the type declaration.

Reported as [LLVM bug 36819](https://bugs.llvm.org/show_bug.cgi?id=36819)

Reviewed By: malcolm.parsons

Differential Revision: https://reviews.llvm.org/D93333
---
 .../cppcoreguidelines/ProTypeMemberInitCheck.cpp |  4 ++++
 .../cppcoreguidelines-pro-type-member-init.cpp   | 16 ++++++++++++++++
 2 files changed, 20 insertions(+)

diff --git a/clang-tools-extra/clang-tidy/cppcoreguidelines/ProTypeMemberInitCheck.cpp b/clang-tools-extra/clang-tidy/cppcoreguidelines/ProTypeMemberInitCheck.cpp
index a223d215af1b..67856be843e7 100644
--- a/clang-tools-extra/clang-tidy/cppcoreguidelines/ProTypeMemberInitCheck.cpp
+++ b/clang-tools-extra/clang-tidy/cppcoreguidelines/ProTypeMemberInitCheck.cpp
@@ -297,6 +297,10 @@ void ProTypeMemberInitCheck::check(const MatchFinder::MatchResult &Result) {
     // Skip declarations delayed by late template parsing without a body.
     if (!Ctor->getBody())
       return;
+    // Skip out-of-band explicitly defaulted special member functions
+    // (except the default constructor).
+    if (Ctor->isExplicitlyDefaulted() && !Ctor->isDefaultConstructor())
+      return;
     checkMissingMemberInitializer(*Result.Context, *Ctor->getParent(), Ctor);
     checkMissingBaseClassInitializer(*Result.Context, *Ctor->getParent(), Ctor);
   } else if (const auto *Record =
diff --git a/clang-tools-extra/test/clang-tidy/checkers/cppcoreguidelines-pro-type-member-init.cpp b/clang-tools-extra/test/clang-tidy/checkers/cppcoreguidelines-pro-type-member-init.cpp
index 28230dd6952e..403f28baf99d 100644
--- a/clang-tools-extra/test/clang-tidy/checkers/cppcoreguidelines-pro-type-member-init.cpp
+++ b/clang-tools-extra/test/clang-tidy/checkers/cppcoreguidelines-pro-type-member-init.cpp
@@ -501,3 +501,19 @@ struct NegativeImplicitInheritedCtor : NegativeImplicitInheritedCtorBase {
 void Bug33557() {
   NegativeImplicitInheritedCtor I(5);
 }
+
+struct NegativeDefaultedCtorOutOfDecl {
+  NegativeDefaultedCtorOutOfDecl(const NegativeDefaultedCtorOutOfDecl &);
+  int F;
+};
+
+NegativeDefaultedCtorOutOfDecl::NegativeDefaultedCtorOutOfDecl(const NegativeDefaultedCtorOutOfDecl &) = default;
+
+struct PositiveDefaultConstructorOutOfDecl {
+  PositiveDefaultConstructorOutOfDecl();
+  int F;
+  // CHECK-FIXES: int F{};
+};
+
+PositiveDefaultConstructorOutOfDecl::PositiveDefaultConstructorOutOfDecl() = default;
+// CHECK-MESSAGES: :[[@LINE-1]]:1: warning: constructor does not initialize these fields: F