CC       config.o
In file included from config.c:29:
./logrotate.h:86:5: warning: empty macro arguments are a C99 feature [-Wc99-extensions]
    TAILQ_ENTRY(logInfo) list;
    ^
./queue.h:382:52: note: expanded from macro 'TAILQ_ENTRY'
#define TAILQ_ENTRY(type)       _TAILQ_ENTRY(struct type,)
                                                         ^
In file included from config.c:29:
./logrotate.h:89:1: warning: empty macro arguments are a C99 feature [-Wc99-extensions]
TAILQ_HEAD(logInfoHead, logInfo);
^
./queue.h:372:62: note: expanded from macro 'TAILQ_HEAD'
#define TAILQ_HEAD(name, type)  _TAILQ_HEAD(name, struct type,)
                                                              ^
config.c:123:21: warning: commas at the end of enumerator lists are a C99-specific feature [-Wc99-extensions]
    STATE_ERROR = 64,
                    ^
config.c:733:9: warning: designated initializers are a C99 feature [-Wc99-designator]
        .pattern = NULL,
        ^
config.c:934:9: warning: designated initializers are a C99 feature [-Wc99-designator]
        .l_start = 0,
        ^
5 warnings generated.
  CC       log.o
  CC       logrotate.o
In file included from logrotate.c:31:
./logrotate.h:86:5: warning: empty macro arguments are a C99 feature [-Wc99-extensions]
    TAILQ_ENTRY(logInfo) list;
    ^
./queue.h:382:52: note: expanded from macro 'TAILQ_ENTRY'
#define TAILQ_ENTRY(type)       _TAILQ_ENTRY(struct type,)
                                                         ^
In file included from logrotate.c:31:
./logrotate.h:89:1: warning: empty macro arguments are a C99 feature [-Wc99-extensions]
TAILQ_HEAD(logInfoHead, logInfo);
^
./queue.h:372:62: note: expanded from macro 'TAILQ_HEAD'
#define TAILQ_HEAD(name, type)  _TAILQ_HEAD(name, struct type,)
                                                              ^
logrotate.c:908:42: warning: initializer for aggregate is not a compile-time constant [-Wc99-extensions]
    char * const mailArgv[] = { (char *) mailComm, (char *) "-s", (char *) subject, (char *) address, NULL };
                                         ^~~~~~~~
logrotate.c:2927:27: warning: initializer for aggregate is not a compile-time constant [-Wc99-extensions]
        {"force", 'f', 0, &force, 0, "Force file rotation", NULL},
                          ^~~~~~
4 warnings generated.
  CCLD     logrotate

[...]
log.h:24:67: warning: ISO C90 does not support ‘__func__’ predefined identifier [-Wpedantic]
   24 |         message(MESS_ERROR, "cannot allocate memory [%s():%d]\n", __func__, __LINE__); \
      |                                                                   ^~~~~~~~
config.c:172:9: note: in expansion of macro ‘message_OOM’
  172 |         message_OOM();
      |         ^~~~~~~~~~~
[...]
logrotate.c:2222:37: warning: ISO C90 does not support the ‘j’ gnu_printf length modifier [-Wformat=]
 2222 |                 message(MESS_DEBUG, "after %jd days ", (intmax_t)log->threshold);
      |                                     ^~~~~~~~~~~~~~~~~
logrotate.c:2234:37: warning: ISO C90 does not support the ‘j’ gnu_printf length modifier [-Wformat=]
 2234 |                 message(MESS_DEBUG, "%jd bytes ", (intmax_t)log->threshold);
      |                                     ^~~~~~~~~~~~
logrotate.c:2256:29: warning: ISO C90 does not support the ‘j’ gnu_printf length modifier [-Wformat=]
 2256 |         message(MESS_DEBUG, "only log files >= %jd bytes are rotated, ", (intmax_t)log->minsize);
      |                             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
logrotate.c:2259:29: warning: ISO C90 does not support the ‘j’ gnu_printf length modifier [-Wformat=]
 2259 |         message(MESS_DEBUG, "log files >= %jd are rotated earlier, ", (intmax_t)log->maxsize);
      |                             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
[...]