libstdc++: Add unused attributes to suppress warnings

libstdc++-v3/ChangeLog:

	* include/bits/atomic_base.h: Fix -Wunused-variable
	warnings.
	* include/ext/new_allocator.h: Fix -Wunused-parameter
	warnings.

2 files changed, 45 insertions, 23 deletions

diff --git a/libstdc++-v3/include/bits/atomic_base.h b/libstdc++-v3/include/bits/atomic_base.h
index 015acef..2cdd2bd 100644
--- a/libstdc++-v3/include/bits/atomic_base.h
+++ b/libstdc++-v3/include/bits/atomic_base.h
@@ -231,7 +231,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
     _GLIBCXX_ALWAYS_INLINE void
     clear(memory_order __m = memory_order_seq_cst) noexcept
     {
-      memory_order __b = __m & __memory_order_mask;
+      memory_order __b __attribute__ ((__unused__))
+	= __m & __memory_order_mask;
       __glibcxx_assert(__b != memory_order_consume);
       __glibcxx_assert(__b != memory_order_acquire);
       __glibcxx_assert(__b != memory_order_acq_rel);
@@ -242,7 +243,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
     _GLIBCXX_ALWAYS_INLINE void
     clear(memory_order __m = memory_order_seq_cst) volatile noexcept
     {
-      memory_order __b = __m & __memory_order_mask;
+      memory_order __b __attribute__ ((__unused__))
+	= __m & __memory_order_mask;
       __glibcxx_assert(__b != memory_order_consume);
       __glibcxx_assert(__b != memory_order_acquire);
       __glibcxx_assert(__b != memory_order_acq_rel);
@@ -416,7 +418,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
       _GLIBCXX_ALWAYS_INLINE void
       store(__int_type __i, memory_order __m = memory_order_seq_cst) noexcept
       {
-	memory_order __b = __m & __memory_order_mask;
+	memory_order __b __attribute__ ((__unused__))
+	  = __m & __memory_order_mask;
 	__glibcxx_assert(__b != memory_order_acquire);
 	__glibcxx_assert(__b != memory_order_acq_rel);
 	__glibcxx_assert(__b != memory_order_consume);
@@ -428,7 +431,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
       store(__int_type __i,
 	    memory_order __m = memory_order_seq_cst) volatile noexcept
       {
-	memory_order __b = __m & __memory_order_mask;
+	memory_order __b __attribute__ ((__unused__))
+	  = __m & __memory_order_mask;
 	__glibcxx_assert(__b != memory_order_acquire);
 	__glibcxx_assert(__b != memory_order_acq_rel);
 	__glibcxx_assert(__b != memory_order_consume);
@@ -439,7 +443,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
       _GLIBCXX_ALWAYS_INLINE __int_type
       load(memory_order __m = memory_order_seq_cst) const noexcept
       {
-	memory_order __b = __m & __memory_order_mask;
+	memory_order __b __attribute__ ((__unused__))
+	  = __m & __memory_order_mask;
 	__glibcxx_assert(__b != memory_order_release);
 	__glibcxx_assert(__b != memory_order_acq_rel);
 
@@ -449,7 +454,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
       _GLIBCXX_ALWAYS_INLINE __int_type
       load(memory_order __m = memory_order_seq_cst) const volatile noexcept
       {
-	memory_order __b = __m & __memory_order_mask;
+	memory_order __b __attribute__ ((__unused__))
+	  = __m & __memory_order_mask;
 	__glibcxx_assert(__b != memory_order_release);
 	__glibcxx_assert(__b != memory_order_acq_rel);
 
@@ -475,8 +481,10 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
       compare_exchange_weak(__int_type& __i1, __int_type __i2,
 			    memory_order __m1, memory_order __m2) noexcept
       {
-	memory_order __b2 = __m2 & __memory_order_mask;
-	memory_order __b1 = __m1 & __memory_order_mask;
+	memory_order __b2 __attribute__ ((__unused__))
+	  = __m2 & __memory_order_mask;
+	memory_order __b1 __attribute__ ((__unused__))
+	  = __m1 & __memory_order_mask;
 	__glibcxx_assert(__b2 != memory_order_release);
 	__glibcxx_assert(__b2 != memory_order_acq_rel);
 	__glibcxx_assert(__b2 <= __b1);
@@ -490,8 +498,10 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 			    memory_order __m1,
 			    memory_order __m2) volatile noexcept
       {
-	memory_order __b2 = __m2 & __memory_order_mask;
-	memory_order __b1 = __m1 & __memory_order_mask;
+	memory_order __b2 __attribute__ ((__unused__))
+	  = __m2 & __memory_order_mask;
+	memory_order __b1 __attribute__ ((__unused__))
+	  = __m1 & __memory_order_mask;
 	__glibcxx_assert(__b2 != memory_order_release);
 	__glibcxx_assert(__b2 != memory_order_acq_rel);
 	__glibcxx_assert(__b2 <= __b1);
@@ -520,8 +530,10 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
       compare_exchange_strong(__int_type& __i1, __int_type __i2,
 			      memory_order __m1, memory_order __m2) noexcept
       {
-	memory_order __b2 = __m2 & __memory_order_mask;
-	memory_order __b1 = __m1 & __memory_order_mask;
+	memory_order __b2 __attribute__ ((__unused__))
+	  = __m2 & __memory_order_mask;
+	memory_order __b1 __attribute__ ((__unused__))
+	  = __m1 & __memory_order_mask;
 	__glibcxx_assert(__b2 != memory_order_release);
 	__glibcxx_assert(__b2 != memory_order_acq_rel);
 	__glibcxx_assert(__b2 <= __b1);
@@ -535,8 +547,10 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 			      memory_order __m1,
 			      memory_order __m2) volatile noexcept
       {
-	memory_order __b2 = __m2 & __memory_order_mask;
-	memory_order __b1 = __m1 & __memory_order_mask;
+	memory_order __b2 __attribute__ ((__unused__))
+	  = __m2 & __memory_order_mask;
+	memory_order __b1 __attribute__ ((__unused__))
+	  = __m1 & __memory_order_mask;
 
 	__glibcxx_assert(__b2 != memory_order_release);
 	__glibcxx_assert(__b2 != memory_order_acq_rel);
@@ -736,7 +750,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
       store(__pointer_type __p,
 	    memory_order __m = memory_order_seq_cst) noexcept
       {
-        memory_order __b = __m & __memory_order_mask;
+	memory_order __b __attribute__ ((__unused__))
+	  = __m & __memory_order_mask;
 
 	__glibcxx_assert(__b != memory_order_acquire);
 	__glibcxx_assert(__b != memory_order_acq_rel);
@@ -749,7 +764,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
       store(__pointer_type __p,
 	    memory_order __m = memory_order_seq_cst) volatile noexcept
       {
-	memory_order __b = __m & __memory_order_mask;
+	memory_order __b __attribute__ ((__unused__))
+	  = __m & __memory_order_mask;
 	__glibcxx_assert(__b != memory_order_acquire);
 	__glibcxx_assert(__b != memory_order_acq_rel);
 	__glibcxx_assert(__b != memory_order_consume);
@@ -760,7 +776,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
       _GLIBCXX_ALWAYS_INLINE __pointer_type
       load(memory_order __m = memory_order_seq_cst) const noexcept
       {
-	memory_order __b = __m & __memory_order_mask;
+	memory_order __b __attribute__ ((__unused__))
+	  = __m & __memory_order_mask;
 	__glibcxx_assert(__b != memory_order_release);
 	__glibcxx_assert(__b != memory_order_acq_rel);
 
@@ -770,7 +787,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
       _GLIBCXX_ALWAYS_INLINE __pointer_type
       load(memory_order __m = memory_order_seq_cst) const volatile noexcept
       {
-	memory_order __b = __m & __memory_order_mask;
+	memory_order __b __attribute__ ((__unused__))
+	  = __m & __memory_order_mask;
 	__glibcxx_assert(__b != memory_order_release);
 	__glibcxx_assert(__b != memory_order_acq_rel);
 
@@ -797,8 +815,10 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 			      memory_order __m1,
 			      memory_order __m2) noexcept
       {
-	memory_order __b2 = __m2 & __memory_order_mask;
-	memory_order __b1 = __m1 & __memory_order_mask;
+	memory_order __b2 __attribute__ ((__unused__))
+	  = __m2 & __memory_order_mask;
+	memory_order __b1 __attribute__ ((__unused__))
+	  = __m1 & __memory_order_mask;
 	__glibcxx_assert(__b2 != memory_order_release);
 	__glibcxx_assert(__b2 != memory_order_acq_rel);
 	__glibcxx_assert(__b2 <= __b1);
@@ -812,8 +832,10 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 			      memory_order __m1,
 			      memory_order __m2) volatile noexcept
       {
-	memory_order __b2 = __m2 & __memory_order_mask;
-	memory_order __b1 = __m1 & __memory_order_mask;
+	memory_order __b2 __attribute__ ((__unused__))
+	  = __m2 & __memory_order_mask;
+	memory_order __b1 __attribute__ ((__unused__))
+	  = __m1 & __memory_order_mask;
 
 	__glibcxx_assert(__b2 != memory_order_release);
 	__glibcxx_assert(__b2 != memory_order_acq_rel);
diff --git a/libstdc++-v3/include/ext/new_allocator.h b/libstdc++-v3/include/ext/new_allocator.h
index 131718b..2e21a98 100644
--- a/libstdc++-v3/include/ext/new_allocator.h
+++ b/libstdc++-v3/include/ext/new_allocator.h
@@ -117,7 +117,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 
       // __p is not permitted to be a null pointer.
       void
-      deallocate(_Tp* __p, size_type __t)
+      deallocate(_Tp* __p, size_type __t __attribute__ ((__unused__)))
       {
 #if __cpp_aligned_new
 	if (alignof(_Tp) > __STDCPP_DEFAULT_NEW_ALIGNMENT__)