options.c:546:1: warning: control may reach end of non-void function [-Wreturn-type]
}
^
options.c:591:15: warning: using the result of an assignment as a condition without parentheses [-Wparentheses]
    while (ch = *src) {
           ~~~^~~~~~
options.c:591:15: note: place parentheses around the assignment to silence this warning
    while (ch = *src) {
              ^
           (        )
options.c:591:15: note: use '==' to turn this assignment into an equality comparison
    while (ch = *src) {
              ^
              ==
2 warnings generated.
rfc931.c:163:14: warning: using the result of an assignment as a condition without parentheses [-Wparentheses]
                    if (cp = strchr(user, '\r'))
                        ~~~^~~~~~~~~~~~~~~~~~~~
rfc931.c:163:14: note: place parentheses around the assignment to silence this warning
                    if (cp = strchr(user, '\r'))
                           ^
                        (                      )
rfc931.c:163:14: note: use '==' to turn this assignment into an equality comparison
                    if (cp = strchr(user, '\r'))
                           ^
                           ==
1 warning generated.
fix_options.c:50:62: warning: passing 'int *' to parameter of type 'socklen_t *' (aka 'unsigned int *') converts between pointers to integer types with different sign [-Wpointer-sign]
    if (getsockopt(fd, ipproto, IP_OPTIONS, (char *) optbuf, &optsize) == 0
                                                             ^~~~~~~~
/usr/include/x86_64-linux-gnu/sys/socket.h:210:32: note: passing argument to parameter '__optlen' here
                       socklen_t *__restrict __optlen) __THROW;
                                             ^
1 warning generated.
socket.c:100:38: warning: passing 'int *' to parameter of type 'socklen_t *' (aka 'unsigned int *') converts between pointers to integer types with different sign [-Wpointer-sign]
                     (struct sockaddr *) & client, &len) < 0) {
                                                   ^~~~
/usr/include/x86_64-linux-gnu/sys/socket.h:165:27: note: passing argument to parameter '__addr_len' here
                         socklen_t *__restrict __addr_len);
                                               ^
socket.c:118:55: warning: passing 'int *' to parameter of type 'socklen_t *' (aka 'unsigned int *') converts between pointers to integer types with different sign [-Wpointer-sign]
    if (getsockname(fd, (struct sockaddr *) & server, &len) < 0) {
                                                      ^~~~
/usr/include/x86_64-linux-gnu/sys/socket.h:117:26: note: passing argument to parameter '__len' here
                        socklen_t *__restrict __len) __THROW;
                                              ^
socket.c:251:73: warning: passing 'int *' to parameter of type 'socklen_t *' (aka 'unsigned int *') converts between pointers to integer types with different sign [-Wpointer-sign]
    (void) recvfrom(fd, buf, sizeof(buf), 0, (struct sockaddr *) & sin, &size);
                                                                        ^~~~~
/usr/include/x86_64-linux-gnu/sys/socket.h:165:27: note: passing argument to parameter '__addr_len' here
                         socklen_t *__restrict __addr_len);
                                               ^
3 warnings generated.
workarounds.c:171:38: warning: passing 'int *' to parameter of type 'socklen_t *' (aka 'unsigned int *') converts between pointers to integer types with different sign [-Wpointer-sign]
    if ((ret = getpeername(sock, sa, len)) >= 0
                                     ^~~
/usr/include/x86_64-linux-gnu/sys/socket.h:131:26: note: passing argument to parameter '__len' here
                        socklen_t *__restrict __len) __THROW;
                                              ^
1 warning generated.
percent_m.c:32:16: warning: using the result of an assignment as a condition without parentheses [-Wparentheses]
    while (*bp = *cp)
           ~~~~^~~~~
percent_m.c:32:16: note: place parentheses around the assignment to silence this warning
    while (*bp = *cp)
               ^
           (        )
percent_m.c:32:16: note: use '==' to turn this assignment into an equality comparison
    while (*bp = *cp)
               ^
               ==
1 warning generated.
tcpdchk.c:206:12: warning: using the result of an assignment as a condition without parentheses [-Wparentheses]
    if (fp = fopen(table, "r")) {
        ~~~^~~~~~~~~~~~~~~~~~~
tcpdchk.c:206:12: note: place parentheses around the assignment to silence this warning
    if (fp = fopen(table, "r")) {
           ^
        (                     )
tcpdchk.c:206:12: note: use '==' to turn this assignment into an equality comparison
    if (fp = fopen(table, "r")) {
           ^
           ==
tcpdchk.c:332:15: warning: using the result of an assignment as a condition without parentheses [-Wparentheses]
            if (host = split_at(cp + 1, '@')) { /* user@host */
                ~~~~~^~~~~~~~~~~~~~~~~~~~~~~
tcpdchk.c:332:15: note: place parentheses around the assignment to silence this warning
            if (host = split_at(cp + 1, '@')) { /* user@host */
                     ^
                (                           )
tcpdchk.c:332:15: note: use '==' to turn this assignment into an equality comparison
            if (host = split_at(cp + 1, '@')) { /* user@host */
                     ^
                     ==
tcpdchk.c:447:21: warning: using the result of an assignment as a condition without parentheses [-Wparentheses]
    } else if (mask = split_at(pat, '/')) {     /* network/netmask */
               ~~~~~^~~~~~~~~~~~~~~~~~~~
tcpdchk.c:447:21: note: place parentheses around the assignment to silence this warning
    } else if (mask = split_at(pat, '/')) {     /* network/netmask */
                    ^
               (                        )
tcpdchk.c:447:21: note: use '==' to turn this assignment into an equality comparison
    } else if (mask = split_at(pat, '/')) {     /* network/netmask */
                    ^
                    ==
3 warnings generated.
CMake Warning:
  Manually-specified variables were not used by the project:

    CMAKE_EXPORT_NO_PACKAGE_REGISTRY