build: don't fully qualify the installation path

CMakeLists.txt

@@ -727,7 +727,7 @@ install (
 FILES
     "${CMAKE_CURRENT_BINARY_DIR}/libcruft.pc"
 DESTINATION
-    "${CMAKE_INSTALL_PREFIX}/share/pkgconfig"
+    "share/pkgconfig"
 )
 
 

random.hpp

@@ -16,6 +16,8 @@
 #include <limits>
 #include <type_traits>
 
+#include <chrono>
+
 
 namespace cruft::random {
     ///////////////////////////////////////////////////////////////////////////
@@ -25,8 +27,19 @@ namespace cruft::random {
     initialise (void)
     {
         // Approximate the state size of the generator by its size in bytes.
-        std::array<unsigned,sizeof (GeneratorT) / sizeof (unsigned) + 1> seed;
-        std::generate (seed.begin (), seed.end (), std::random_device ());
+        std::array<unsigned,sizeof (GeneratorT) / sizeof (unsigned) + 1 + 1> seed;
+        std::generate_n (
+            seed.begin (),
+            seed.size () - 1,
+            std::random_device ()
+        );
+
+        // Append the current time with the highest resolution we have
+        // available. This defends against instances where the implementation
+        // of std::random_device is actually deterministic.
+        seed[seed.size () - 1] = static_cast<unsigned> (
+            std::chrono::high_resolution_clock::now ().time_since_epoch ().count ()
+        );
 
         std::seed_seq seq (seed.begin (), seed.end ());
         return GeneratorT (seq);