> I'll simply use a modified version of Keith's suggestion:
>
> foo.ps: foo.ms
> groff --some-options foo.ms >$@ \
> || ($(RM) $@; false)
Indeed, you can use `false', instead of `exit 1', as I suggested.
But note that `false' is *not* a shell builtin in standard Bourne
shell -- it is in `ksh' or `bash' -- so you are potentially adding
an extra external process invocation here. `exit' is a builtin in
*all* Bourne compatible shells, AFAIK.
> That seems to be a reasonable idiom (although it adds a shell
> invocation or two -- it there a sane, portable way of
> eliminating the parenthesis?)
You could also try...
foo.ps: foo.ms
groff $(GROFF_OPTIONS) foo.ms >$@ \
|| { $(RM) $@; exit 1; }
That should avoid one level of forking in the shell, but note
the extra semicolon, which is required when you use braces in
place of parentheses. There is also a slight possibility that,
without the extra forked shell, you may not get back the exit
code you expect, at the appropriate time.
HTH.
Best regards,
Keith.
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