These are typically seen when the C std requires setting errno.
./src/alloc.c ./src/file_pos.c ./src/math_longdouble.c ./src/mbstring.c ./src/sc/asin_StarCore.c ./src/sc/atan2_StarCore.c ./src/sc/exp_StarCore.c ./src/sc/file_io_StarCore.c ./src/sc/math_StarCore.c ./src/sc/signal_StarCore.c ./src/sc/sqrt_StarCore.c ./src/sc/time_StarCore.c ./src/signal.c ./src/strtold.c ./src/strtoul.c ./src/sun_math/Double_precision/e_acos.c ./src/sun_math/Double_precision/e_asin.c ./src/sun_math/Double_precision/e_atanh.c ./src/sun_math/Double_precision/e_log.c ./src/sun_math/Double_precision/e_log10.c ./src/sun_math/Double_precision/e_pow.c ./src/sun_math/Double_precision/e_sqrt.c ./src/sun_math/Double_precision/k_standard.c ./src/sun_math/math_sun.c ./src/wcstold.c ./src/wcstoul.c