Better source location for -Wignored-qualifiers on trailing return types

We collect the source location of a trailing return type in the parser,
improving the location for regular functions and providing a location
for lambdas, where previously there was none.

Fixes PR47732.

Reviewed By: aaron.ballman

Differential Revision: https://reviews.llvm.org/D90129

1 files changed, 4 insertions, 1 deletions

diff --git a/clang/lib/Parse/ParseDecl.cpp b/clang/lib/Parse/ParseDecl.cpp
index 01a1657..281cd6d 100644
--- a/clang/lib/Parse/ParseDecl.cpp
+++ b/clang/lib/Parse/ParseDecl.cpp
@@ -6429,6 +6429,7 @@ void Parser::ParseFunctionDeclarator(Declarator &D,
   CachedTokens *ExceptionSpecTokens = nullptr;
   ParsedAttributesWithRange FnAttrs(AttrFactory);
   TypeResult TrailingReturnType;
+  SourceLocation TrailingReturnTypeLoc;
 
   /* LocalEndLoc is the end location for the local FunctionTypeLoc.
      EndLoc is the end location for the function declarator.
@@ -6539,6 +6540,7 @@ void Parser::ParseFunctionDeclarator(Declarator &D,
         SourceRange Range;
         TrailingReturnType =
             ParseTrailingReturnType(Range, D.mayBeFollowedByCXXDirectInit());
+        TrailingReturnTypeLoc = Range.getBegin();
         EndLoc = Range.getEnd();
       }
     } else if (standardAttributesAllowed()) {
@@ -6571,7 +6573,8 @@ void Parser::ParseFunctionDeclarator(Declarator &D,
                     DynamicExceptionRanges.data(), DynamicExceptions.size(),
                     NoexceptExpr.isUsable() ? NoexceptExpr.get() : nullptr,
                     ExceptionSpecTokens, DeclsInPrototype, StartLoc,
-                    LocalEndLoc, D, TrailingReturnType, &DS),
+                    LocalEndLoc, D, TrailingReturnType, TrailingReturnTypeLoc,
+                    &DS),
                 std::move(FnAttrs), EndLoc);
 }