Fix warnings in test/std/language.support

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@242624 91177308-0d34-0410-b5e6-96231b3b80d8

test/std/language.support/support.runtime/csignal.pass.cpp

@@ -50,7 +50,8 @@
 
 int main()
 {
-    std::sig_atomic_t sig;
+    std::sig_atomic_t sig = 0;
+    ((void)sig);
     typedef void (*func)(int);
     static_assert((std::is_same<decltype(std::signal(0, (func)0)), func>::value), "");
     static_assert((std::is_same<decltype(std::raise(0)), int>::value), "");

test/std/language.support/support.runtime/cstdarg.pass.cpp

@@ -32,4 +32,5 @@
 int main()
 {
     std::va_list va;
+    ((void)va);
 }

test/std/language.support/support.runtime/cstdlib.pass.cpp

@@ -11,6 +11,7 @@
 
 #include <cstdlib>
 #include <type_traits>
+#include <cassert>
 
 #ifndef EXIT_FAILURE
 #error EXIT_FAILURE not defined
@@ -32,12 +33,23 @@
 #error RAND_MAX not defined
 #endif
 
+template <class TestType, class IntType>
+void test_div_struct() {
+    TestType obj;
+    static_assert(sizeof(obj) >= sizeof(IntType) * 2, ""); // >= to account for alignment.
+    static_assert(std::is_same<decltype(obj.quot), IntType>::value, "");
+    static_assert(std::is_same<decltype(obj.rem), IntType>::value, "");
+    ((void) obj);
+};
+
 int main()
 {
     std::size_t s = 0;
-    std::div_t d;
-    std::ldiv_t ld;
-    std::lldiv_t lld;
+    ((void)s);
+    static_assert(std::is_same<std::size_t, decltype(sizeof(int))>::value, "");
+    test_div_struct<std::div_t, int>();
+    test_div_struct<std::ldiv_t, long>();
+    test_div_struct<std::lldiv_t, long long>();
     char** endptr = 0;
     static_assert((std::is_same<decltype(std::atof("")), double>::value), "");
     static_assert((std::is_same<decltype(std::atoi("")), int>::value), "");

test/std/language.support/support.runtime/ctime.pass.cpp

@@ -23,6 +23,7 @@
 int main()
 {
     std::clock_t c = 0;
+    ((void)c);
     std::size_t s = 0;
     std::time_t t = 0;
     std::tm tm = {0};