> the commands in a certain rule to generate a target always give > a return code different to 0x00. [...] > I'd like to have something like this: > > $(OUTPUT) : $(INPUT) > -command -o $@ -c $< > fail_if_target_does_not_exist_or_is_older_than_input $@ $<
[[ -e $@ ]] || echo "$@ does not exist"
[[ $@ -ot $< ]] && echo "$@ is older than $<"
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