Fixes:
../../libraries/AP_Terrain/TerrainGCS.cpp: In member function ‘void AP_Terrain::
handle_terrain_data(const mavlink_message_t&)’:
../../libraries/AP_Terrain/AP_Terrain.h:65:55: error: comparison between signed
and unsigned integer expressions [-Werror=sign-compare]
#define TERRAIN_LATLON_EQUAL(v1, v2) (labs((v1)-(v2)) <= unsigned(margin.get()*
100))
~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
~~~~
../../libraries/AP_Terrain/AP_Terrain.h:65:55: note: in definition of macro ‘TER
RAIN_LATLON_EQUAL’
#define TERRAIN_LATLON_EQUAL(v1, v2) (labs((v1)-(v2)) <= unsigned(margin.get()*
100))
^~
compilation terminated due to -Wfatal-errors.
cc1plus: some warnings being treated as errors
In file included from ../../libraries/AP_Terrain/TerrainUtil.cpp:24:0:
../../libraries/AP_Terrain/TerrainUtil.cpp: In member function ‘AP_Terrain::grid
_cache& AP_Terrain::find_grid_cache(const AP_Terrain::grid_info&)’:
../../libraries/AP_Terrain/AP_Terrain.h:65:55: error: comparison between signed
and unsigned integer expressions [-Werror=sign-compare]
#define TERRAIN_LATLON_EQUAL(v1, v2) (labs((v1)-(v2)) <= unsigned(margin.get()*
100))
~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
~~~~
The return value of labs is signed
Peter Barker
a4b3c7eb46