$ tsxs -o objhits.so -c objhits.cc -lstdc++
  compiling objhits.cc -> objhits.lo
objhits.cc:54:7: warning: variable 'resp_bufp' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized]
  if (m->find(url) == m->end()) {
      ^~~~~~~~~~~~~~~~~~~~~~~~
objhits.cc:90:23: note: uninitialized use occurs here
  TSHandleMLocRelease(resp_bufp, http_hdr_loc, new_field_loc);
                      ^~~~~~~~~
objhits.cc:54:3: note: remove the 'if' if its condition is always false
  if (m->find(url) == m->end()) {
  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
objhits.cc:46:22: note: initialize the variable 'resp_bufp' to silence this warning
  TSMBuffer resp_bufp;
                     ^
                      = nullptr
objhits.cc:54:7: warning: variable 'http_hdr_loc' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized]
  if (m->find(url) == m->end()) {
      ^~~~~~~~~~~~~~~~~~~~~~~~
objhits.cc:90:34: note: uninitialized use occurs here
  TSHandleMLocRelease(resp_bufp, http_hdr_loc, new_field_loc);
                                 ^~~~~~~~~~~~
objhits.cc:54:3: note: remove the 'if' if its condition is always false
  if (m->find(url) == m->end()) {
  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
objhits.cc:48:22: note: initialize the variable 'http_hdr_loc' to silence this warning
  TSMLoc http_hdr_loc;
                     ^
                      = nullptr
objhits.cc:60:7: warning: variable 'new_field_loc' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized]
  if (TSHttpTxnClientRespGet(txnp, &resp_bufp, &http_hdr_loc) != TS_SUCCESS) {
      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
objhits.cc:90:48: note: uninitialized use occurs here
  TSHandleMLocRelease(resp_bufp, http_hdr_loc, new_field_loc);
                                               ^~~~~~~~~~~~~
objhits.cc:60:3: note: remove the 'if' if its condition is always false
  if (TSHttpTxnClientRespGet(txnp, &resp_bufp, &http_hdr_loc) != TS_SUCCESS) {
  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
objhits.cc:54:7: warning: variable 'new_field_loc' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized]
  if (m->find(url) == m->end()) {
      ^~~~~~~~~~~~~~~~~~~~~~~~
objhits.cc:90:48: note: uninitialized use occurs here
  TSHandleMLocRelease(resp_bufp, http_hdr_loc, new_field_loc);
                                               ^~~~~~~~~~~~~
objhits.cc:54:3: note: remove the 'if' if its condition is always false
  if (m->find(url) == m->end()) {
  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
objhits.cc:50:23: note: initialize the variable 'new_field_loc' to silence this warning
  TSMLoc new_field_loc;
                      ^
                       = nullptr
4 warnings generated.
  linking -> objhits.so