Commiting for http://reviews.llvm.org/D20365

llvm-svn: 270472

clang-tools-extra/clang-tidy/modernize/PassByValueCheck.cpp

@@ -181,6 +181,12 @@ void PassByValueCheck::check(const MatchFinder::MatchResult &Result) {
   if (!paramReferredExactlyOnce(Ctor, ParamDecl))
     return;
 
+
+  // If the parameter is trivial to copy, don't move it. Moving a trivivally
+  // copyable type will cause a problem with modernize-pass-by-value
+  if (ParamDecl->getType().isTriviallyCopyableType(*Result.Context)) 
+    return;
+
   auto Diag = diag(ParamDecl->getLocStart(), "pass by value and use std::move");
 
   // Iterate over all declarations of the constructor.

clang-tools-extra/test/clang-tidy/modernize-pass-by-value.cpp

@@ -194,3 +194,9 @@ struct S {
   Movable M;
 };
 
+// Test that types that are trivially copyable will not use std::move. This will
+// cause problems with misc-move-const-arg, as it will revert it.
+struct T {
+  std::array<int, 10> a_;
+  T(std::array<int, 10> a) : a_(a) {}
+};