Make conditional linking happen in makefile for merges

src/merge_std.c

@@ -0,0 +1,28 @@
+#include "merge.h"
+
+#define MERGE_GOAL (int)((sizeof(merge_values)/sizeof(merge_values[0]))-1)
+
+const long merge_values[] = {
+    0, 2, 4, 8, 16, 32, 64, 128, 256, 512,
+    1024, 2048
+};
+
+inline long merge_value(const int v1)
+{
+    return v1 <= MERGE_GOAL ? merge_values[v1] : -1;
+}
+
+inline long merge_goal(void)
+{
+    return MERGE_GOAL;
+}
+
+inline int merge_possible(const int v1, const int v2)
+{
+    return v1 == v2;
+}
+
+inline int merge_result(const int v1, const int v2)
+{
+    return merge_possible(v1, v2) ? v1 + 1 : -1;
+}