From: Zack Weinberg <zack@wolery.cumb.org>
Date: Thu, 20 Apr 2000 16:09:27 +0000 (+0000)
Subject: c-common.c (decl_attributes): Set TREE_USED on the object pointed to.
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=06a50fff5b99c7ef17476befe92888ee7f4e8a08;p=gcc.git

c-common.c (decl_attributes): Set TREE_USED on the object pointed to.

	* c-common.c (decl_attributes) [A_ALIAS]: Set TREE_USED on the
	object pointed to.

From-SVN: r33284
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index d863072038f..970c789d308 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2000-04-20  Zack Weinberg  <zack@wolery.cumb.org>
+
+	* c-common.c (decl_attributes) [A_ALIAS]: Set TREE_USED on the
+	object pointed to.
+
 Thu Apr 20 14:19:18 MET DST 2000  Jan Hubicka  <jh@suse.cz>
 
 	* loop.c (emit_iv_add_mult):  Simplify it's input and emit
diff --git a/gcc/c-common.c b/gcc/c-common.c
index 386721a66d4..32b2ede864b 100644
--- a/gcc/c-common.c
+++ b/gcc/c-common.c
@@ -981,6 +981,8 @@ decl_attributes (node, attributes, prefix_attributes)
 		  break;
 		}
 	      id = get_identifier (TREE_STRING_POINTER (id));
+	      /* This counts as a use of the object pointed to.  */
+	      TREE_USED (id) = 1;
 
 	      if (TREE_CODE (decl) == FUNCTION_DECL)
 		DECL_INITIAL (decl) = error_mark_node;
diff --git a/gcc/testsuite/gcc.dg/20000419-2.c b/gcc/testsuite/gcc.dg/20000419-2.c
new file mode 100644
index 00000000000..05e4729572c
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/20000419-2.c
@@ -0,0 +1,17 @@
+/* A static function with a global alias should not get 'defined but
+   not used' warnings.  Exposed by Linux kernel.  */
+/* { dg-do compile } */
+/* { dg-options "-Wall" } */
+
+extern void do_something (void);
+extern void do_something_else (void);
+
+static int
+init_foobar(void)  /* { dg-bogus "defined but not used" "not used warning" } */
+{
+  do_something();
+  do_something_else();
+  return 0;
+}
+
+int init_module(void) __attribute__((alias("init_foobar")));