Fix clang 15.0.0 build

clang 15.0.0 has a bug that requires us to define the constructor for the Block
class in order to be able to emplace_back at the std::vector<Block>.

This is fixed in clang 16.0.0

Author: cgkantidis

src/Duplo.cpp

@@ -134,8 +134,8 @@ namespace {
                     seqLen++;
                 } else {
                     if (seqLen >= lMinBlockSize) {
-                        int line1 = y + x - seqLen;
-                        int line2 = x - seqLen;
+                        unsigned line1 = y + x - seqLen;
+                        unsigned line2 = x - seqLen;
                         if (line1 != line2 || source1 != source2) {
                             dup_blocks.emplace_back(&source1, &source2, line1, line2, seqLen);
                             num_dup_lines += seqLen;
@@ -148,8 +148,8 @@ namespace {
             }
 
             if (seqLen >= lMinBlockSize) {
-                int line1 = m - seqLen;
-                int line2 = n - seqLen;
+                unsigned line1 = m - seqLen;
+                unsigned line2 = n - seqLen;
                 if (line1 != line2 || source1 != source2) {
                     dup_blocks.emplace_back(&source1, &source2, line1, line2, seqLen);
                     num_dup_lines += seqLen;

src/include/Block.h

@@ -11,7 +11,16 @@ class Block {
     unsigned m_line2;
     unsigned m_count;
 
-    auto operator<=>(Block const &) const = default;
+    Block(SourceFile const* source1,
+          SourceFile const* source2,
+          unsigned line1,
+          unsigned line2,
+          unsigned count)
+          : m_source1{ source1 },
+            m_source2{ source2 },
+            m_line1{ line1 },
+            m_line2{ line2 },
+            m_count{ count } {}
 };
 
 #endif