From: Jason Merrill <jason@redhat.com>
Date: Wed, 20 Jan 2010 21:30:28 +0000 (-0500)
Subject: re PR c++/41920 ([C++0x] Invalid 'unused parameter' warning for parameters used in... 
X-Git-Tag: releases/gcc-4.5.0~1122
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=1f4a7a481f5d76f2932c69f17adffd6bc37add04;p=thirdparty%2Fgcc.git

re PR c++/41920 ([C++0x] Invalid 'unused parameter' warning for parameters used in lambdas)

	PR c++/41920
	* semantics.c (build_lambda_object): Call mark_used on captured
	variables.

From-SVN: r156085
---

diff --git a/gcc/cp/ChangeLog b/gcc/cp/ChangeLog
index 726983807bba..828f4b089a4b 100644
--- a/gcc/cp/ChangeLog
+++ b/gcc/cp/ChangeLog
@@ -1,5 +1,9 @@
 2010-01-20  Jason Merrill  <jason@redhat.com>
 
+	PR c++/41920
+	* semantics.c (build_lambda_object): Call mark_used on captured
+	variables.
+
 	PR c++/40750
 	* decl.c (grokdeclarator): Clear type_quals for a member function
 	declared using a typedef.  Don't complain about adding cv-quals
diff --git a/gcc/cp/semantics.c b/gcc/cp/semantics.c
index fa3ecda205d5..1545443c8cf4 100644
--- a/gcc/cp/semantics.c
+++ b/gcc/cp/semantics.c
@@ -5408,6 +5408,9 @@ build_lambda_object (tree lambda_expr)
       tree field = TREE_PURPOSE (node);
       tree val = TREE_VALUE (node);
 
+      if (DECL_P (val))
+	mark_used (val);
+
       /* Mere mortals can't copy arrays with aggregate initialization, so
 	 do some magic to make it work here.  */
       if (TREE_CODE (TREE_TYPE (field)) == ARRAY_TYPE)
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index db9bb35d5157..99c56149a4e8 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,5 +1,8 @@
 2010-01-20  Jason Merrill  <jason@redhat.com>
 
+	PR c++/41920
+	* g++.dg/cpp0x/lambda/lambda-warn1.C: New.
+
 	PR c++/40750
 	* g++.dg/parse/fn-typedef1.C: New.
 	* g++.dg/other/cv_quals.C: Adjust.
diff --git a/gcc/testsuite/g++.dg/cpp0x/lambda/lambda-warn1.C b/gcc/testsuite/g++.dg/cpp0x/lambda/lambda-warn1.C
new file mode 100644
index 000000000000..b384d5cff6d7
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp0x/lambda/lambda-warn1.C
@@ -0,0 +1,8 @@
+// PR c++/41920
+// { dg-options "-std=c++0x -Wall -Wextra" }
+
+int foo(int i)
+{
+    auto bar = [=](){ return i; };
+    return bar();
+}