Cache.cc:2892:11: warning: variable 'disk_full' set but not used [-Wunused-but-set-variable]
      int disk_full         = 0;
          ^      
Store.cc:306:7: warning: variable 'ln' set but not used [-Wunused-but-set-variable]
  int ln          = 0;
      ^
RemapConfig.cc:151:17: warning: variable 'idx' set but not used [-Wunused-but-set-variable]
  for (unsigned idx = 1; str; idx++) {
                ^
LogObject.cc:1131:12: warning: variable 'num_kept_objects' set but not used [-Wunused-but-set-variable]
  unsigned num_kept_objects = 0;      
           ^
traffic_cache_tool/CacheDefs.cc:545:9: warning: variable 'len' set but not used [-Wunused-but-set-variable]
    int len          = 0;
        ^
gold_tests/tls/ssl-post.c:108:7: warning: variable 'read_count' set but not used [-Wunused-but-set-variable]
  int read_count     = 0;
      ^
gold_tests/tls/ssl-post.c:109:7: warning: variable 'write_count' set but not used [-Wunused-but-set-variable]
  int write_count    = 1;
      ^

Improvements to Clang’s diagnostics
...
  * -Wunused-but-set-variable now also warns if the variable is only used by unary operators.
...