re PR c/7741 (ICE on conflicting types (make_decl_rtl at varasm.c:834))

	PR c/7741
	* c-decl.c (duplicate_decls): Discard the initializer of the
	new decl when the types are conflicting.

Co-Authored-By: Christian Ehrhardt <ehrhardt@mathematik.uni-ulm.de>

From-SVN: r62631

gcc/ChangeLog

+2003-02-10  Eric Botcazou  <ebotcazou@libertysurf.fr>
+            Christian Ehrhardt  <ehrhardt@mathematik.uni-ulm.de>
+
+	PR c/7741
+	* c-decl.c (duplicate_decls): Discard the initializer of the
+	new decl when the types are conflicting.
+
 2003-02-10  Josef Zlomek  <zlomekj@suse.cz>
 
 	* Makefile.in (sreal.o): Added.

gcc/c-decl.c

@@ -1140,6 +1140,12 @@ duplicate_decls (newdecl, olddecl, different_binding_level)
 	    }
 	}
       error_with_decl (olddecl, "previous declaration of `%s'");
+
+      /* This is safer because the initializer might contain references
+	 to variables that were declared between olddecl and newdecl. This
+	 will make the initializer invalid for olddecl in case it gets
+	 assigned to olddecl below.  */
+      DECL_INITIAL (newdecl) = 0;
     }
   /* TLS cannot follow non-TLS declaration.  */
   else if (TREE_CODE (olddecl) == VAR_DECL && TREE_CODE (newdecl) == VAR_DECL

gcc/testsuite/ChangeLog

+2003-02-10  Eric Botcazou  <ebotcazou@libertysurf.fr>
+            Christian Ehrhardt  <ehrhardt@mathematik.uni-ulm.de>
+
+	* gcc.dg/decl-2.c: New test.
+
 Mon Feb 10 11:41:20 CET 2003  Jan Hubicka  <jh@suse.cz>
 
 	* gcc.dg/i386-fpcvt-1.c:  New test.

gcc/testsuite/gcc.dg/decl-2.c

+/* PR c/7411 */
+/* Contributed by Christian Ehrhardt */
+/* { dg-do compile } */
+
+void foo(void)
+{
+  char c;  /* { dg-error "previous declaration" } */
+  int i;
+  int c = i;  /* { dg-error "conflicting types" } */
+}