[clang] fixing conditional explicit for out-of-line definition PR42980

Summary: not every read in CXXConstructorDecl::getExplicitSpecifierInternal() was made on the canonical declaration.

Reviewers: rsmith, aaron.ballman

Reviewed By: rsmith

Subscribers: cfe-commits

Tags: #clang

Differential Revision: https://reviews.llvm.org/D67889

llvm-svn: 372530

clang/include/clang/AST/DeclCXX.h

@@ -2555,9 +2555,9 @@ class CXXConstructorDecl final
 
   ExplicitSpecifier getExplicitSpecifierInternal() const {
     if (CXXConstructorDeclBits.HasTrailingExplicitSpecifier)
-      return *getCanonicalDecl()->getTrailingObjects<ExplicitSpecifier>();
+      return *getTrailingObjects<ExplicitSpecifier>();
     return ExplicitSpecifier(
-        nullptr, getCanonicalDecl()->CXXConstructorDeclBits.IsSimpleExplicit
+        nullptr, CXXConstructorDeclBits.IsSimpleExplicit
                      ? ExplicitSpecKind::ResolvedTrue
                      : ExplicitSpecKind::ResolvedFalse);
   }
@@ -2598,10 +2598,10 @@ class CXXConstructorDecl final
          InheritedConstructor Inherited = InheritedConstructor());
 
   ExplicitSpecifier getExplicitSpecifier() {
-    return getExplicitSpecifierInternal();
+    return getCanonicalDecl()->getExplicitSpecifierInternal();
   }
   const ExplicitSpecifier getExplicitSpecifier() const {
-    return getExplicitSpecifierInternal();
+    return getCanonicalDecl()->getExplicitSpecifierInternal();
   }
 
   /// Return true if the declartion is already resolved to be explicit.

clang/test/SemaCXX/cxx2a-explicit-bool.cpp

@@ -717,3 +717,21 @@ A d2{0, 0};
 A d3 = {0.0, 0.0};// expected-error {{explicit deduction guide}}
 
 }
+
+namespace PR42980 {
+using size_t = decltype(sizeof(0));
+
+struct Str {// expected-note+ {{candidate constructor}}
+  template <size_t N>
+  explicit(N > 7)// expected-note {{resolved to true}}
+  Str(char const (&str)[N]);
+};
+
+template <size_t N>
+Str::Str(char const(&str)[N]) { }
+// expected-note@-1 {{candidate constructor}}
+
+Str a = "short";
+Str b = "not so short";// expected-error {{no viable conversion}}
+
+}