libgps

Bazel overlay for gpsd libgps.

Overlay Files

The overlay adds a hand-authored include/gpsd_config.h because upstream generates this header from SCons configuration checks before compiling libgps.

When bumping libgps to a newer gpsd release:

1. Compare upstream SConstruct and SConscript configuration checks with the defines in overlay/include/gpsd_config.h.
2. Update overlay/include/gpsd_config.h for changed version constants, protocol constants, feature checks, and platform-specific defines.
3. Run bazel run //tools:update_integrity after modifying overlay files.
4. Verify the targets listed in modules/libgps/<version>/presubmit.yml.

The generated ais_json.i and libgps/gps_maskdump.c files are produced by Bazel during the build and are not checked into the overlay.