gpsd v3.19's function gps_read() has changed causing olsrd to fail

Currently there is a PR to upgrade gprsd to version 3.19 in the master branch of openwrt (https://github.com/openwrt/packages/pull/9588). With the upgrade from 3.17 to 3.19 the function call gps_read() has changed from

gps_read(struct gps_data_t *gpsdata) to gps_read(struct gps_data_t *, char *message, int message_len)

for a bit more background, openwrt has migrated to python3 (https://github.com/openwrt/openwrt/commit/316c8b5503e54cdb3ee5bd3b5d81a3b7dd139294) and therefore the upgrade from gpsd v3.17 to v3.19 is necessary.

in libgps_core.c, the function has the following comments:

/* read from a gpsd connection
 *
 * parameters:
 *    gps_data_t *gpsdata   -- structure for GPS data
 *    char *message         -- NULL, or optional buffer for received JSON
 *    int message_len       -- zero, or sizeof(message)
 */
int gps_read(struct gps_data_t *gpsdata CONDITIONALLY_UNUSED,
             char *message, int message_len)

There is already a patch written for OLSRd to make the required changes https://github.com/openwrt-routing/packages/pull/490

OLSR / olsrd

gpsd v3.19's function gps_read() has changed causing olsrd to fail #74