BUILD: logs: use __fallthrough in build_log_header()

This avoids 4 build warnings when preprocessing happens before compiling
with gcc >= 7.

diff --git a/src/log.c b/src/log.c
index 5be654c9fb7e512659e0e8d027c87bc993c48d3c..1fdcd815952c16b22249926feb0d60818b41165f 100644 (file)
--- a/src/log.c
+++ b/src/log.c
@@ -627,7 +627,7 @@ int parse_logformat_string(const char *fmt, struct proxy *curproxy, struct list
                                        cformat = LF_SEPARATOR;
                                        break;
                                }
-                               /* fall through */
+                               __fallthrough;
                        default : cformat = LF_TEXT;      break;
                        }
                }
@@ -1383,7 +1383,7 @@ struct ist *build_log_header(enum log_fmt format, int level, int facility,
                case LOG_FORMAT_PRIO:
                        fac_level = facility << 3;
                        /* further format ignore the facility */
-                       /* fall through */
+                       __fallthrough;
                case LOG_FORMAT_TIMED:
                case LOG_FORMAT_SHORT:
                        fac_level += level;
@@ -1476,7 +1476,7 @@ struct ist *build_log_header(enum log_fmt format, int level, int facility,
                                break;
                        }
                        /* let continue as 'timed' and 'iso' format for usual timestamp */
-                       /* fall through */
+                       __fallthrough;
                case LOG_FORMAT_TIMED:
                case LOG_FORMAT_ISO:
                        /* ISO format ex: '1900:01:01T12:00:00.123456Z'
@@ -1550,7 +1550,7 @@ struct ist *build_log_header(enum log_fmt format, int level, int facility,
                        }
                        else /* the caller MUST fill the hostname, this field is mandatory */
                                hdr_ctx.ist_vector[(*nbelem)++] = ist2("localhost ", 10);
-                       /* fall through */
+                       __fallthrough;
                case LOG_FORMAT_LOCAL:
                        if (!metadata || !metadata[LOG_META_TAG].len)
                                break;