[PATCH] D24848: [clang-tidy] fix false-positive for cppcoreguidelines-pro-type-member-init with in-class initializers

[Matthias Gehre via cfe-commits]

mgehre created this revision.
mgehre added reviewers: alexfh, aaron.ballman.
mgehre added a subscriber: cfe-commits.
Herald added a subscriber: nemanjai.

This fixes https://llvm.org/bugs/show_bug.cgi?id=30487 where
```
warning: uninitialized record type: 's' [cppcoreguidelines-pro-type-member-init]
```
is emitted on
```
struct MyStruct
{
    int a = 5;
    int b = 7;
};

int main()
{
    MyStruct s;
}
```

https://reviews.llvm.org/D24848

Files:
  clang-tidy/utils/TypeTraits.cpp
  test/clang-tidy/cppcoreguidelines-pro-type-member-init.cpp

Index: test/clang-tidy/cppcoreguidelines-pro-type-member-init.cpp
===================================================================
--- test/clang-tidy/cppcoreguidelines-pro-type-member-init.cpp
+++ test/clang-tidy/cppcoreguidelines-pro-type-member-init.cpp
@@ -367,3 +367,14 @@
   PositiveIndirectMember() {}
   // CHECK-MESSAGES: :[[@LINE-1]]:3: warning: constructor does not initialize these fields: A
 };
+
+
+struct Bug30487
+{
+  int a = 0;
+};
+
+void Bug30487_f()
+{
+  Bug30487 s;
+}
Index: clang-tidy/utils/TypeTraits.cpp
===================================================================
--- clang-tidy/utils/TypeTraits.cpp
+++ clang-tidy/utils/TypeTraits.cpp
@@ -62,8 +62,10 @@
   if (ClassDecl->hasTrivialDefaultConstructor())
     return true;
 
-  // If all its fields are trivially constructible.
+  // If all its fields are trivially constructible and have no default initializers.
   for (const FieldDecl *Field : ClassDecl->fields()) {
+    if (Field->hasInClassInitializer())
+      return false;
     if (!isTriviallyDefaultConstructible(Field->getType(), Context))
       return false;
   }


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