Index: test/std/depr/depr.c.headers/setjmp_h.pass.cpp
===================================================================
--- test/std/depr/depr.c.headers/setjmp_h.pass.cpp
+++ test/std/depr/depr.c.headers/setjmp_h.pass.cpp
@@ -19,6 +19,7 @@
 int main()
 {
     jmp_buf jb;
+    ((void)jb); // Prevent unused warning
     static_assert((std::is_same<decltype(longjmp(jb, 0)), void>::value),
                   "std::is_same<decltype(longjmp(jb, 0)), void>::value");
 }
Index: test/std/depr/depr.c.headers/stdio_h.pass.cpp
===================================================================
--- test/std/depr/depr.c.headers/stdio_h.pass.cpp
+++ test/std/depr/depr.c.headers/stdio_h.pass.cpp
@@ -108,10 +108,16 @@
 {
     FILE* fp = 0;
     fpos_t fpos = {0};
-    size_t s = 0; ((void)s);
+    size_t s = 0;
     char* cp = 0;
     char arr[] = {'a', 'b'};
     va_list va;
+    ((void)fp); // Prevent unused warning
+    ((void)fpos); // Prevent unused warning
+    ((void)s); // Prevent unused warning
+    ((void)cp); // Prevent unused warning
+    ((void)arr); // Prevent unused warning
+    ((void)va); // Prevent unused warning
     static_assert((std::is_same<decltype(remove("")), int>::value), "");
     static_assert((std::is_same<decltype(rename("","")), int>::value), "");
     static_assert((std::is_same<decltype(tmpfile()), FILE*>::value), "");
Index: test/std/input.output/file.streams/c.files/cstdio.pass.cpp
===================================================================
--- test/std/input.output/file.streams/c.files/cstdio.pass.cpp
+++ test/std/input.output/file.streams/c.files/cstdio.pass.cpp
@@ -91,6 +91,11 @@
     std::size_t s = 0;
     char* cp = 0;
     std::va_list va;
+    ((void)fp); // Prevent unused warning
+    ((void)fpos); // Prevent unused warning
+    ((void)s); // Prevent unused warning
+    ((void)cp); // Prevent unused warning
+    ((void)va); // Prevent unused warning
     static_assert((std::is_same<decltype(std::fclose(fp)), int>::value), "");
     static_assert((std::is_same<decltype(std::fflush(fp)), int>::value), "");
     static_assert((std::is_same<decltype(std::setbuf(fp,cp)), void>::value), "");
Index: test/std/iterators/iterator.primitives/std.iterator.tags/bidirectional_iterator_tag.pass.cpp
===================================================================
--- test/std/iterators/iterator.primitives/std.iterator.tags/bidirectional_iterator_tag.pass.cpp
+++ test/std/iterators/iterator.primitives/std.iterator.tags/bidirectional_iterator_tag.pass.cpp
@@ -17,6 +17,7 @@
 int main()
 {
     std::bidirectional_iterator_tag tag;
+    ((void)tag); // Prevent unused warning
     static_assert((std::is_base_of<std::forward_iterator_tag,
                                    std::bidirectional_iterator_tag>::value), "");
     static_assert((!std::is_base_of<std::output_iterator_tag,
Index: test/std/iterators/iterator.primitives/std.iterator.tags/forward_iterator_tag.pass.cpp
===================================================================
--- test/std/iterators/iterator.primitives/std.iterator.tags/forward_iterator_tag.pass.cpp
+++ test/std/iterators/iterator.primitives/std.iterator.tags/forward_iterator_tag.pass.cpp
@@ -17,6 +17,7 @@
 int main()
 {
     std::forward_iterator_tag tag;
+    ((void)tag); // Prevent unused warning
     static_assert((std::is_base_of<std::input_iterator_tag,
                                    std::forward_iterator_tag>::value), "");
     static_assert((!std::is_base_of<std::output_iterator_tag,
Index: test/std/iterators/iterator.primitives/std.iterator.tags/input_iterator_tag.pass.cpp
===================================================================
--- test/std/iterators/iterator.primitives/std.iterator.tags/input_iterator_tag.pass.cpp
+++ test/std/iterators/iterator.primitives/std.iterator.tags/input_iterator_tag.pass.cpp
@@ -17,6 +17,7 @@
 int main()
 {
     std::input_iterator_tag tag;
+    ((void)tag); // Prevent unused warning
     static_assert((!std::is_base_of<std::output_iterator_tag,
                                     std::input_iterator_tag>::value), "");
 }
Index: test/std/iterators/iterator.primitives/std.iterator.tags/output_iterator_tag.pass.cpp
===================================================================
--- test/std/iterators/iterator.primitives/std.iterator.tags/output_iterator_tag.pass.cpp
+++ test/std/iterators/iterator.primitives/std.iterator.tags/output_iterator_tag.pass.cpp
@@ -17,6 +17,7 @@
 int main()
 {
     std::output_iterator_tag tag;
+    ((void)tag); // Prevent unused warning
     static_assert((!std::is_base_of<std::input_iterator_tag,
                                     std::output_iterator_tag>::value), "");
 }
Index: test/std/iterators/iterator.primitives/std.iterator.tags/random_access_iterator_tag.pass.cpp
===================================================================
--- test/std/iterators/iterator.primitives/std.iterator.tags/random_access_iterator_tag.pass.cpp
+++ test/std/iterators/iterator.primitives/std.iterator.tags/random_access_iterator_tag.pass.cpp
@@ -17,6 +17,7 @@
 int main()
 {
     std::random_access_iterator_tag tag;
+    ((void)tag); // Prevent unused warning
     static_assert((std::is_base_of<std::bidirectional_iterator_tag,
                                    std::random_access_iterator_tag>::value), "");
     static_assert((!std::is_base_of<std::output_iterator_tag,
Index: test/std/language.support/support.exception/except.nested/throw_with_nested.pass.cpp
===================================================================
--- test/std/language.support/support.exception/except.nested/throw_with_nested.pass.cpp
+++ test/std/language.support/support.exception/except.nested/throw_with_nested.pass.cpp
@@ -112,7 +112,7 @@
             std::throw_with_nested(Final());
             assert(false);
         }
-        catch (const Final &f)
+        catch (const Final &)
         {
         }
     }
Index: test/std/language.support/support.exception/propagation/current_exception.pass.cpp
===================================================================
--- test/std/language.support/support.exception/propagation/current_exception.pass.cpp
+++ test/std/language.support/support.exception/propagation/current_exception.pass.cpp
@@ -74,7 +74,7 @@
             throw A();
             assert(false);
         }
-        catch (A& a)
+        catch (A&)
         {
             std::exception_ptr p = std::current_exception();
             assert(A::constructed == 1);
@@ -94,7 +94,7 @@
             throw A();
             assert(false);
         }
-        catch (A a)
+        catch (A)
         {
             std::exception_ptr p = std::current_exception();
             assert(A::constructed == 2);
Index: test/std/language.support/support.runtime/csetjmp.pass.cpp
===================================================================
--- test/std/language.support/support.runtime/csetjmp.pass.cpp
+++ test/std/language.support/support.runtime/csetjmp.pass.cpp
@@ -19,6 +19,7 @@
 int main()
 {
     std::jmp_buf jb;
+    ((void)jb); // Prevent unused warning
     static_assert((std::is_same<decltype(std::longjmp(jb, 0)), void>::value),
                   "std::is_same<decltype(std::longjmp(jb, 0)), void>::value");
 }
Index: test/std/language.support/support.runtime/ctime.pass.cpp
===================================================================
--- test/std/language.support/support.runtime/ctime.pass.cpp
+++ test/std/language.support/support.runtime/ctime.pass.cpp
@@ -23,10 +23,13 @@
 int main()
 {
     std::clock_t c = 0;
-    ((void)c);
     std::size_t s = 0;
     std::time_t t = 0;
     std::tm tm = {0};
+    ((void)c); // Prevent unused warning
+    ((void)s); // Prevent unused warning
+    ((void)t); // Prevent unused warning
+    ((void)tm); // Prevent unused warning
     static_assert((std::is_same<decltype(std::clock()), std::clock_t>::value), "");
     static_assert((std::is_same<decltype(std::difftime(t,t)), double>::value), "");
     static_assert((std::is_same<decltype(std::mktime(&tm)), std::time_t>::value), "");
@@ -39,5 +42,7 @@
 #endif
     char* c1 = 0;
     const char* c2 = 0;
+    ((void)c1); // Prevent unused warning
+    ((void)c2); // Prevent unused warning
     static_assert((std::is_same<decltype(std::strftime(c1,s,c2,&tm)), std::size_t>::value), "");
 }
Index: test/std/localization/c.locales/clocale.pass.cpp
===================================================================
--- test/std/localization/c.locales/clocale.pass.cpp
+++ test/std/localization/c.locales/clocale.pass.cpp
@@ -47,6 +47,7 @@
 int main()
 {
     std::lconv lc;
+    ((void)lc); // Prevent unused warning
 #ifndef _LIBCPP_HAS_NO_THREAD_UNSAFE_C_FUNCTIONS
     static_assert((std::is_same<decltype(std::setlocale(0, "")), char*>::value), "");
 #endif
Index: test/std/localization/locale.categories/category.numeric/locale.nm.put/facet.num.put.members/put_long_double.pass.cpp
===================================================================
--- test/std/localization/locale.categories/category.numeric/locale.nm.put/facet.num.put.members/put_long_double.pass.cpp
+++ test/std/localization/locale.categories/category.numeric/locale.nm.put/facet.num.put.members/put_long_double.pass.cpp
@@ -24419,6 +24419,7 @@
     output_iterator<char*> iter;
     std::locale lc = std::locale::classic();
     std::locale lg(lc, new my_numpunct);
+    ((void)str); // Prevent unused warning
 #ifdef __APPLE__
 // This test is failing on FreeBSD, possibly due to different representations
 // of the floating point numbers.  
@@ -26221,7 +26222,6 @@
     test10();
     test11();
     test12();
-    char str[200];
     output_iterator<char*> iter;
     std::locale lc = std::locale::classic();
     std::locale lg(lc, new my_numpunct);
Index: test/std/numerics/cfenv/cfenv.syn/cfenv.pass.cpp
===================================================================
--- test/std/numerics/cfenv/cfenv.syn/cfenv.pass.cpp
+++ test/std/numerics/cfenv/cfenv.syn/cfenv.pass.cpp
@@ -62,6 +62,8 @@
 {
     std::fenv_t fenv;
     std::fexcept_t fex;
+    ((void)fenv); // Prevent unused warning
+    ((void)fex); // Prevent unused warning
     static_assert((std::is_same<decltype(std::feclearexcept(0)), int>::value), "");
     static_assert((std::is_same<decltype(std::fegetexceptflag(&fex, 0)), int>::value), "");
     static_assert((std::is_same<decltype(std::feraiseexcept(0)), int>::value), "");
Index: test/std/numerics/rand/rand.device/eval.pass.cpp
===================================================================
--- test/std/numerics/rand/rand.device/eval.pass.cpp
+++ test/std/numerics/rand/rand.device/eval.pass.cpp
@@ -30,7 +30,7 @@
         r();
         assert(false);
     }
-    catch (const std::system_error& e)
+    catch (const std::system_error&)
     {
     }
 }
Index: test/std/re/re.alg/re.alg.search/grep.pass.cpp
===================================================================
--- test/std/re/re.alg/re.alg.search/grep.pass.cpp
+++ test/std/re/re.alg/re.alg.search/grep.pass.cpp
@@ -35,7 +35,7 @@
             std::regex re(s, flag);
             std::regex_match(s, re);
         } 
-        catch (std::regex_error &ex) {} 
+        catch (std::regex_error &) {} 
     } 
 }
 
Index: test/std/utilities/allocator.adaptor/allocator.adaptor.types/allocator_pointers.pass.cpp
===================================================================
--- test/std/utilities/allocator.adaptor/allocator.adaptor.types/allocator_pointers.pass.cpp
+++ test/std/utilities/allocator.adaptor/allocator.adaptor.types/allocator_pointers.pass.cpp
@@ -37,7 +37,10 @@
 {
      typename std::allocator_traits<Alloc>::pointer        vp;
      typename std::allocator_traits<Alloc>::const_pointer cvp;
-     
+
+     ((void)vp); // Prevent unused warning
+     ((void)cvp); // Prevent unused warning
+
      static_assert(std::is_same<bool, decltype( vp ==  vp)>::value, "");
      static_assert(std::is_same<bool, decltype( vp !=  vp)>::value, "");
      static_assert(std::is_same<bool, decltype( vp >   vp)>::value, "");
@@ -71,7 +74,10 @@
 {
      typename std::allocator_traits<Alloc>::void_pointer        vp;
      typename std::allocator_traits<Alloc>::const_void_pointer cvp;
-     
+
+     ((void)vp); // Prevent unused warning
+     ((void)cvp); // Prevent unused warning
+
      static_assert(std::is_same<bool, decltype( vp ==  vp)>::value, "");
      static_assert(std::is_same<bool, decltype( vp !=  vp)>::value, "");
      static_assert(std::is_same<bool, decltype( vp >   vp)>::value, "");
Index: test/std/utilities/memory/default.allocator/allocator_pointers.pass.cpp
===================================================================
--- test/std/utilities/memory/default.allocator/allocator_pointers.pass.cpp
+++ test/std/utilities/memory/default.allocator/allocator_pointers.pass.cpp
@@ -36,7 +36,10 @@
 {
      typename std::allocator_traits<Alloc>::pointer        vp;
      typename std::allocator_traits<Alloc>::const_pointer cvp;
-     
+
+     ((void)vp); // Prevent unused warning
+     ((void)cvp); // Prevent unused warning
+
      static_assert(std::is_same<bool, decltype( vp ==  vp)>::value, "");
      static_assert(std::is_same<bool, decltype( vp !=  vp)>::value, "");
      static_assert(std::is_same<bool, decltype( vp >   vp)>::value, "");
@@ -70,7 +73,10 @@
 {
      typename std::allocator_traits<Alloc>::void_pointer        vp;
      typename std::allocator_traits<Alloc>::const_void_pointer cvp;
-     
+
+     ((void)vp); // Prevent unused warning
+     ((void)cvp); // Prevent unused warning
+
      static_assert(std::is_same<bool, decltype( vp ==  vp)>::value, "");
      static_assert(std::is_same<bool, decltype( vp !=  vp)>::value, "");
      static_assert(std::is_same<bool, decltype( vp >   vp)>::value, "");
Index: test/std/utilities/time/date.time/ctime.pass.cpp
===================================================================
--- test/std/utilities/time/date.time/ctime.pass.cpp
+++ test/std/utilities/time/date.time/ctime.pass.cpp
@@ -21,11 +21,15 @@
 int main()
 {
     std::clock_t c = 0;
-    ((void)c); // avoid unused warning
     std::size_t s = 0;
     std::time_t t = 0;
     std::tm tm = {0};
     char str[3];
+    ((void)c); // Prevent unused warning
+    ((void)s); // Prevent unused warning
+    ((void)t); // Prevent unused warning
+    ((void)tm); // Prevent unused warning
+    ((void)str); // Prevent unused warning
     static_assert((std::is_same<decltype(std::clock()), std::clock_t>::value), "");
     static_assert((std::is_same<decltype(std::difftime(t,t)), double>::value), "");
     static_assert((std::is_same<decltype(std::mktime(&tm)), std::time_t>::value), "");
Index: test/std/utilities/utility/forward/forward.pass.cpp
===================================================================
--- test/std/utilities/utility/forward/forward.pass.cpp
+++ test/std/utilities/utility/forward/forward.pass.cpp
@@ -39,6 +39,9 @@
     A a;
     const A ca = A();
 
+    ((void)a); // Prevent unused warning
+    ((void)ca); // Prevent unused warning
+
 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
     static_assert(sizeof(test(std::forward<A&>(a))) == 1, "");
     static_assert(sizeof(test(std::forward<A>(a))) == 4, "");