These lines were added last year: /* Initialize library function table. */ #undef TARGET_INIT_LIBFUNCS #define TARGET_INIT_LIBFUNCS rs6000_vxworks_init_libfuncs but TARGET_INIT_LIBFUNCS is #undef-ed in config/rs6000/rs6000.c and rs6000_vxworks_init_libfuncs is nowhere defined in any case. Applied on mainline and 11 branch as obvious. 2021-10-04 Eric Botcazou * config/rs6000/vxworks.h (TARGET_INIT_LIBFUNCS): Delete. -- Eric Botcazou