# %ifdef et al based on config.h settings or other %include'd files.
define preprocess-versions
sed '/^[ ]*#/d;s/^[ ]*%/#/' \
-| $(CC) -traditional -E -undef -I$(common-objdir) -I$(..)include \
+| $(CC) -E -undef -I$(common-objdir) -I$(..)include \
-include $(common-objpfx)config.h \
- -x c - \
+ -x assembler-with-cpp - \
| sed '/^[ ]*#/d;/^[ ]*$$/d'
endef