From ef4f94ac977780ceb14adc8dcbcc2eb2c23b5425 Mon Sep 17 00:00:00 2001
From: Richard Henderson <rth@redhat.com>
Date: Wed, 3 Apr 2002 14:39:51 -0800
Subject: re PR rtl-optimization/4330 (Optimizer generates illegal assembly
 code)

        PR opt/4330
        * langhooks.h (lang_hooks.decls.warn_unused_global): New.
        * toplev.c (check_global_declarations): Use it.
        * langhooks-def.h (lhd_warn_unused_global_decl): Declare.
        (LANG_HOOKS_WARN_UNUSED_GLOBAL_DECL): New.
        (LANG_HOOKS_DECLS): Add it.
        * langhooks.c (lhd_warn_unused_global_decl): New.
        * c-decl.c (LANG_HOOKS_WARN_UNUSED_GLOBAL_DECL): New.
        * c-objc-common.c (c_warn_unused_global_decl): New.
        * c-tree.h (c_warn_unused_global_decl): Declare.
        * objc/objc-lang.c (LANG_HOOKS_WARN_UNUSED_GLOBAL_DECL): New.

        * cp-lang.c (cxx_warn_unused_global_decl): New.
        (LANG_HOOKS_WARN_UNUSED_GLOBAL_DECL): New.

	* g++.dg/warn/Wunused-2.C: New.
	* gcc.dg/unused-4.c: New.

From-SVN: r51818
---
 gcc/langhooks.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

(limited to 'gcc/langhooks.c')

diff --git a/gcc/langhooks.c b/gcc/langhooks.c
index 4cdb8ab..128e6de 100644
--- a/gcc/langhooks.c
+++ b/gcc/langhooks.c
@@ -113,6 +113,25 @@ lhd_staticp (exp)
   return 0;
 }
 
+/* Called from check_global_declarations.  */
+
+bool
+lhd_warn_unused_global_decl (decl)
+     tree decl;
+{
+  /* This is what used to exist in check_global_declarations.  Probably
+     not many of these actually apply to non-C languages.  */
+
+  if (TREE_CODE (decl) == FUNCTION_DECL && DECL_INLINE (decl))
+    return false;
+  if (TREE_CODE (decl) == VAR_DECL && TREE_READONLY (decl))
+    return false;
+  if (DECL_IN_SYSTEM_HEADER (decl))
+    return false;
+
+  return true;
+}
+
 /* Called when -dy is given on the command line.  */
 
 void
-- 
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