[Diagnostics] Skip var decl of structs for -Wstring-concatenation

Author: davidbolvansky

clang/lib/Sema/SemaDecl.cpp

@@ -12886,7 +12886,8 @@ void Sema::CheckCompleteVariableDeclaration(VarDecl *var) {
                                                AttributeCommonInfo::AS_Pragma));
   }
 
-  if (var->hasInit() && isa<InitListExpr>(var->getInit())) {
+  if (!var->getType()->isStructureType() && var->hasInit() &&
+      isa<InitListExpr>(var->getInit())) {
     const auto *ILE = cast<InitListExpr>(var->getInit());
     unsigned NumInits = ILE->getNumInits();
     if (NumInits > 2)
@@ -12927,7 +12928,7 @@ void Sema::CheckCompleteVariableDeclaration(VarDecl *var) {
             Diag(SL->getBeginLoc(),
                  diag::note_concatenated_string_literal_silence);
           }
-          // Warn just once.
+          // In any case, stop now.
           break;
         }
       }

clang/test/Sema/string-concat.c

@@ -148,6 +148,12 @@ const A not_warn6 =  A{"",
                       ""};
 #endif
 
+static A not_warn7 = {"",
+
+  ""
+  "",
+  ""};
+
 
 // Do not warn when all the elements in the initializer are concatenated together.
 const char *all_elems_in_init_concatenated[] = {"a" "b" "c"};