From 740497030f80310c744cad6a0cbbf1658283a68a Mon Sep 17 00:00:00 2001
From: Marc Espie <espie@cvs.openbsd.org>
Date: Wed, 12 May 2010 13:35:57 +0000
Subject: port -ftrampolines/-Wtrampolines support from gcc3. comments and okay
 kettenis@

---
 gnu/gcc/gcc/c.opt         | 8 ++++++++
 gnu/gcc/gcc/tree-nested.c | 9 +++++++++
 2 files changed, 17 insertions(+)

(limited to 'gnu')

diff --git a/gnu/gcc/gcc/c.opt b/gnu/gcc/gcc/c.opt
index 2d38a89b336..d76cefb280d 100644
--- a/gnu/gcc/gcc/c.opt
+++ b/gnu/gcc/gcc/c.opt
@@ -407,6 +407,10 @@ Wtraditional
 C ObjC Var(warn_traditional)
 Warn about features not present in traditional C
 
+Wtrampolines
+Common Var(warn_trampolines)
+Warn when trampolines are emitted
+
 Wtrigraphs
 C ObjC C++ ObjC++
 Warn if trigraphs are encountered that might affect the meaning of the program
@@ -708,6 +712,10 @@ fthreadsafe-statics
 C++ ObjC++
 -fno-threadsafe-statics	Do not generate thread-safe code for initializing local statics
 
+ftrampolines
+Common Var(flag_trampolines)
+Allows trampolines
+
 funsigned-bitfields
 C ObjC C++ ObjC++
 When \"signed\" or \"unsigned\" is not given make the bitfield unsigned
diff --git a/gnu/gcc/gcc/tree-nested.c b/gnu/gcc/gcc/tree-nested.c
index e62c47ae175..1cd9999a296 100644
--- a/gnu/gcc/gcc/tree-nested.c
+++ b/gnu/gcc/gcc/tree-nested.c
@@ -1622,6 +1622,15 @@ convert_tramp_reference (tree *tp, int *walk_subtrees, void *data)
       if (DECL_NO_STATIC_CHAIN (decl))
 	break;
 
+      if (!flag_trampolines) 
+        {
+      	error ("trampoline code generation is not allowed without -ftrampolines");
+	return NULL_TREE;
+        }
+      if (warn_trampolines) 
+        {
+      	warning(0, "local function address taken needing trampoline generation");
+        }
       /* Lookup the immediate parent of the callee, as that's where
 	 we need to insert the trampoline.  */
       for (i = info; i->context != target_context; i = i->outer)
-- 
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