Re: make (possible FAQ)

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#3732

From: mike burrell
Date: Sun, 25 Jan 2004 18:47

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In gnu.utils.help Ian Zimmerman <bayard@newsguy.com> wrote:
> So, how does one handle, in plain make, the situation where multiple
> outputs depend on the same input, and the same command updates both
> outputs?
> 
> The GNU make manual says if both outputs are listed as targets of the
> same rule, the command will be run twice, once for each target --- which
> isn't what I want.  I remember the real situation was more complex with GNU
> make, it tried to optimize this, but it was undocumented and impossible
> to figure out.

I would just make one output file depend on the other.  e.g., I recall doing
something like this once or twice:

y.tab.h:	y.tab.c
y.tab.c:	foo.y
	yacc -d foo.y

Where yacc creates two output files for one input file.  It's perhaps not
the cleanest way of doing things....

-- 
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From: mike burrell <mikpos@shaw.ca>
Subject: Re: make (possible FAQ)
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