Explicit void cast for unused return values

libuavcan/src/marshal/uc_bit_array_copy.cpp

@@ -56,7 +56,7 @@ void bitarrayCopy(const unsigned char* src_org, int src_offset, int src_len, uns
 
             if (byte_len)
             {
-                std::memcpy(dst, src, byte_len);
+                (void)std::memcpy(dst, src, byte_len);
                 src += byte_len;
                 dst += byte_len;
             }

libuavcan/src/marshal/uc_bit_stream.cpp

@@ -94,9 +94,9 @@ std::string BitStream::toString() const
         }
         out += ' ';
     }
-    if (out.length())
+    if (out.length() > 0)
     {
-        out.erase(out.length() - 1, 1);
+        (void)out.erase(out.length() - 1, 1);
     }
     return out;
 }

libuavcan/src/marshal/uc_float_spec.cpp

@@ -67,7 +67,7 @@ uint16_t IEEE754Converter::nativeNonIeeeToHalf(float value)
         return hbits | 0x7C00U;
     }
     int exp;
-    std::frexp(value, &exp);
+    (void)std::frexp(value, &exp);
     if (exp > 16)
     {
         return hbits | 0x7C00U;