CFLAGS-isoc99_fwscanf.c += $(exceptions)
CFLAGS-isoc99_vwscanf.c += $(exceptions)
CFLAGS-isoc99_vfwscanf.c += $(exceptions)
-ifneq (,$(filter %REENTRANT, $(defines)))
-CPPFLAGS += -D_IO_MTSAFE_IO
-endif
+
+CPPFLAGS += $(libio-mtsafe)
# We need to find the default version of strtold_l in stdlib.
CPPFLAGS-wcstold_l.c = -I../stdlib