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

	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 726983807bbabf945b65cc180777775e66fd8ab1..828f4b089a4bcbd92dfc416e8b5d99db6426c990 100644 (file)
--- 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 fa3ecda205d58abb493bef7ad2ab377aabe0fab9..1545443c8cf439bda4dc1999797fe4c438c60297 100644 (file)
--- 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 db9bb35d5157675392580b3a9effa565823f8f58..99c56149a4e89cb07b7a5c2496b1a4d25561eea9 100644 (file)
--- 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 (file)
index 0000000..b384d5c
--- /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();
+}