[clang-tidy] Removed redundant-inline-specifier warning on static data members (#81423)

Updated the check to ignore point static data members with in class
initializer since removing the inline specifier would generate a
compilation error

Fixes #80684

Author: felix642

clang-tools-extra/clang-tidy/readability/RedundantInlineSpecifierCheck.cpp

@@ -88,10 +88,14 @@ void RedundantInlineSpecifierCheck::registerMatchers(MatchFinder *Finder) {
         this);
 
   if (getLangOpts().CPlusPlus17) {
+    const auto IsPartOfRecordDecl = hasAncestor(recordDecl());
     Finder->addMatcher(
-        varDecl(isInlineSpecified(),
-                anyOf(isInternalLinkage(StrictMode),
-                      allOf(isConstexpr(), hasAncestor(recordDecl()))))
+        varDecl(
+            isInlineSpecified(),
+            anyOf(allOf(isInternalLinkage(StrictMode),
+                        unless(allOf(hasInitializer(expr()), IsPartOfRecordDecl,
+                                     isStaticStorageClass()))),
+                  allOf(isConstexpr(), IsPartOfRecordDecl)))
             .bind("var_decl"),
         this);
   }

clang-tools-extra/docs/ReleaseNotes.rst

@@ -164,6 +164,10 @@ Changes in existing checks
   `AllowStringArrays` option, enabling the exclusion of array types with deduced
   length initialized from string literals.
 
+- Improved :doc:`readability-redundant-inline-specifier
+  <clang-tidy/checks/readability/redundant-inline-specifier>` check to properly
+  emit warnings for static data member with an in-class initializer.
+
 Removed checks
 ^^^^^^^^^^^^^^
 

clang-tools-extra/test/clang-tidy/checkers/readability/redundant-inline-specifier.cpp

@@ -135,3 +135,17 @@ INLINE_MACRO()
 
 #define INLINE_KW inline
 INLINE_KW void fn10() { }
+
+namespace {
+class A
+{
+public:
+  static inline float test = 3.0F;
+  static inline double test2 = 3.0;
+  static inline int test3 = 3;
+
+  static inline float test4;
+  // CHECK-MESSAGES-STRICT: :[[@LINE-1]]:10: warning: variable 'test4' has inline specifier but is implicitly inlined [readability-redundant-inline-specifier]
+  // CHECK-FIXES-STRICT: static float test4;
+};
+}