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# Here's an interesting rule!
# The .hi file depends on the .o file,
# so if the .hi file is dated earlier than the .o file (commonly the case,
# when interfaces are stable) this rule just makes sure that the .o file,
# is up to date. Then it does nothing to generate the .hi file from the
# .o file, because the act of making sure the .o file is up to date also
# updates the .hi file (if necessary).
define hi-rule # $1 = way
%.$$($1_hisuf) : %.$$($1_osuf)
@if [ ! -f $$@ ] ; then \
echo Panic! $$< exists, but $$@ does not.; \
exit 1; \
else exit 0 ; \
fi
%.$$($1_way_)hi-boot : %.$$($1_way_)o-boot
@if [ ! -f $$@ ] ; then \
echo Panic! $$< exists, but $$@ does not.; \
exit 1; \
else exit 0 ; \
fi
endef
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