From: Richard Stallman <rms@gnu.org>
Date: Wed, 25 Nov 1992 17:33:21 +0000 (+0000)
Subject: (duplicate_decls): For builtins, create new function
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=32436219b6f789d1400d15e1da117d741033bf2e;p=gcc.git

(duplicate_decls): For builtins, create new function
type instead of trying to modify old one.

(c_decode_option): Decode -Wreturn-type.

From-SVN: r2794
---

diff --git a/gcc/c-decl.c b/gcc/c-decl.c
index 5f5a19181f6..7c7cab71d05 100644
--- a/gcc/c-decl.c
+++ b/gcc/c-decl.c
@@ -1305,10 +1305,15 @@ duplicate_decls (newdecl, olddecl)
 	  tree newreturntype = TREE_TYPE (TREE_TYPE (newdecl));
           if (TYPE_MODE (oldreturntype) == TYPE_MODE (newreturntype))
             {
-              TREE_TYPE (TREE_TYPE (olddecl)) = newreturntype;
-              types_match = comptypes (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
-	      if (!types_match)
-		TREE_TYPE (TREE_TYPE (olddecl)) = oldreturntype;
+	      /* Function types may be shared, so we can't just modify
+		 the return type of olddecl's function type.  */
+	      tree newtype
+		= build_function_type (newreturntype,
+				       TYPE_ARG_TYPES (TREE_TYPE (olddecl)));
+	      
+              types_match = comptypes (TREE_TYPE (newdecl), newtype);
+	      if (types_match)
+		TREE_TYPE (olddecl) = newtype;
 	    }
 	}
       if (!types_match)