Normal AR output matched as error

The second line of the following output gets marked as an error:
../../../../x86/i686-unknown-linux-gnu/bin/i686-unknown-linux-gnu-ar rv lib/libSkyView.a obj/SkyView/circular_buffer_test.o obj/SkyView/cns5k.o obj/SkyView/cns5k_imu_parser.o obj/SkyView/cns5k_imu_parser_tests.o obj/SkyView/crc_32.o obj/SkyView/crc32_tests.o obj/SkyView/cns5k_ins_parser.o obj/SkyView/cns5k_ins_parser_tests.o obj/SkyView/adahrs_cross_checker.o obj/SkyView/adahrs_cross_checker_tests.o
../../../../x86/i686-unknown-linux-gnu/bin/i686-unknown-linux-gnu-ar: creating lib/libSkyView.a
a - obj/SkyView/circular_buffer_test.o
a - obj/SkyView/cns5k.o
a - obj/SkyView/cns5k_imu_parser.o
a - obj/SkyView/cns5k_imu_parser_tests.o
a - obj/SkyView/crc_32.o
a - obj/SkyView/crc32_tests.o
a - obj/SkyView/cns5k_ins_parser.o
a - obj/SkyView/cns5k_ins_parser_tests.o
a - obj/SkyView/adahrs_cross_checker.o
a - obj/SkyView/adahrs_cross_checker_tests.o

As far as I can tell, this is the standard output format for AR.