Make sure pcre PCRE_EXTRA_MATCH_LIMIT_RECURSION check works with strict compiler settings.

configure.in

@@ -199,11 +199,11 @@ AC_INIT(configure.in)
     fi
 
    AC_TRY_COMPILE([ #include <pcre.h> ],
-   [ int eo; eo |= PCRE_EXTRA_MATCH_LIMIT_RECURSION; ],
+   [ int eo = 0; eo |= PCRE_EXTRA_MATCH_LIMIT_RECURSION; ],
    [ pcre_match_limit_recursion_available=yes ], [:]
    )
    if test "$pcre_match_limit_recursion_available" != "yes"; then
-    CFLAGS="${CFLAGS} -DMISSING_PCRE_MATCH_RLIMIT"
+    CFLAGS="${CFLAGS} -DNO_PCRE_MATCH_RLIMIT"
     echo
     echo "   Warning! pcre extra opt PCRE_EXTRA_MATCH_LIMIT_RECURSION not found"
     echo "   This could lead to potential DoS please upgrade to pcre >= 6.5"

src/detect-pcre.c

@@ -358,21 +358,21 @@ DetectPcreData *DetectPcreParse (char *regexstr)
                 pd->sd->match_limit = pcre_match_limit;
                 pd->sd->flags |= PCRE_EXTRA_MATCH_LIMIT;
             }
-#ifndef MISSING_PCRE_MATCH_RLIMIT
+#ifndef NO_PCRE_MATCH_RLIMIT
             if(pcre_match_limit_recursion >= -1)    {
                 pd->sd->match_limit_recursion = pcre_match_limit_recursion;
                 pd->sd->flags |= PCRE_EXTRA_MATCH_LIMIT_RECURSION;
             }
-#endif /* MISSING_PCRE_MATCH_RLIMIT */
+#endif /* NO_PCRE_MATCH_RLIMIT */
         }
         else    {
 
             pd->sd->match_limit = MATCH_LIMIT_DEFAULT;
             pd->sd->flags |= PCRE_EXTRA_MATCH_LIMIT;
-#ifndef MISSING_PCRE_MATCH_RLIMIT
+#ifndef NO_PCRE_MATCH_RLIMIT
             pd->sd->match_limit_recursion = MATCH_LIMIT_DEFAULT;
             pd->sd->flags |= PCRE_EXTRA_MATCH_LIMIT_RECURSION;
-#endif /* MISSING_PCRE_MATCH_RLIMIT */
+#endif /* NO_PCRE_MATCH_RLIMIT */
         }
 
     }