[gcc r13-4134] c: Set the locus of the function result decl

[Bernhard Reutner-Fischer <aldot@gcc.gnu.org>]

https://gcc.gnu.org/g:3f467ea953431aa6af12aaed6d32f476f7ace1e5

commit r13-4134-g3f467ea953431aa6af12aaed6d32f476f7ace1e5
Author: Bernhard Reutner-Fischer <aldot@gcc.gnu.org>
Date:   Sat Nov 6 06:48:00 2021 +0100

    c: Set the locus of the function result decl
    
    gcc/c/ChangeLog:
    
            * c-decl.cc (start_function): Set the result decl source
            location to the location of the typespec.

Diff:
---
 gcc/c/c-decl.cc | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/gcc/c/c-decl.cc b/gcc/c/c-decl.cc
index 36de77814ba..098e475f65d 100644
--- a/gcc/c/c-decl.cc
+++ b/gcc/c/c-decl.cc
@@ -10059,6 +10059,7 @@ start_function (struct c_declspecs *declspecs, struct c_declarator *declarator,
   tree decl1, old_decl;
   tree restype, resdecl;
   location_t loc;
+  location_t result_loc;
 
   current_function_returns_value = 0;  /* Assume, until we see it does.  */
   current_function_returns_null = 0;
@@ -10285,8 +10286,11 @@ start_function (struct c_declspecs *declspecs, struct c_declarator *declarator,
   push_scope ();
   declare_parm_level ();
 
+  /* Set the result decl source location to the location of the typespec.  */
+  result_loc = (declspecs->locations[cdw_typespec] == UNKNOWN_LOCATION
+		? loc : declspecs->locations[cdw_typespec]);
   restype = TREE_TYPE (TREE_TYPE (current_function_decl));
-  resdecl = build_decl (loc, RESULT_DECL, NULL_TREE, restype);
+  resdecl = build_decl (result_loc, RESULT_DECL, NULL_TREE, restype);
   DECL_ARTIFICIAL (resdecl) = 1;
   DECL_IGNORED_P (resdecl) = 1;
   DECL_RESULT (current_function_decl) = resdecl;