build: silence unused var/func warnings

alloc/aligned.hpp

@@ -41,6 +41,7 @@ namespace util::alloc {
         auto
         allocate (size_t bytes, size_t alignment)
         {
+            (void)alignment;
             CHECK_EQ (alignment, m_alignment);
             return m_successor.allocate (bytes, m_alignment);
         }
@@ -58,6 +59,7 @@ namespace util::alloc {
         auto
         deallocate (void *ptr, size_t bytes, size_t alignment)
         {
+            (void)alignment;
             CHECK_EQ (alignment, m_alignment);
             return m_successor.deallocate (ptr, bytes, m_alignment);
         }

crypto/ice.cpp

@@ -392,6 +392,7 @@ ice::scheduleBuild (std::array<uint16_t,4> &kb,
 void
 ice::set (const uint64_t *_key_first, const uint64_t *_key_last)
 {
+    (void)_key_last;
     CHECK_EQ ((unsigned)(_key_last - _key_first), m_size);
 
     auto key = reinterpret_cast<const uint8_t*> (_key_first);

term.cpp

@@ -57,7 +57,7 @@ find_terminfo_path (const std::experimental::filesystem::path &dir,
 // throws an exception if not found
 static
 std::experimental::filesystem::path
-find_terminfo_path (const std::string &key)
+find_terminfo_path [[gnu::unused]] (const std::string &key)
 {
     // check if the path is explicitly listed. must not fall through.
     if (const char *dir = getenv ("TERMINFO")) {