warning           687 contrib/libtests/pngimage.c    display_log(get_dp(pp), LIBPNG_WARNING, "%s", warning);
warning           655 contrib/libtests/pngunknown.c       warning);
warning          3980 contrib/libtests/pngvalid.c    unsigned int    warning :1; /* the error is a warning... */
warning          4023 contrib/libtests/pngvalid.c          ps->expect_error = !error_test[test].warning;
warning          4024 contrib/libtests/pngvalid.c          ps->expect_warning = error_test[test].warning;
warning           407 pngconf.h                  __attribute__((warning("This function is not exported by libpng.")))