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[bug #42833] Prunes targets with pattern rules for no obvious reason

From: Paul D. Smith
Subject: [bug #42833] Prunes targets with pattern rules for no obvious reason
Date: Sun, 21 Sep 2014 20:39:15 +0000
User-agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/37.0.2062.120 Safari/537.36

Update of bug #42833 (project make):

                  Status:                    None => Not A Bug              
             Open/Closed:                    Open => Closed                 


Follow-up Comment #1:

To me make's behavior seems correct.

Possibly you've missed the difference in behavior between explicit rules with
multiple targets and pattern rules with multiple targets.  An explicit rule
with N multiple targets is identical to writing the same rule N times, once
with each target.  So this:

foo bar: ; echo $@

is identical to writing this:

foo: ; echo $@
bar: ; echo $@

This appears to be what you want.

However, pattern rules are different; see

A pattern rule with multiple targets tells make that ONE invocation of that
recipe will build BOTH targets.  That's why you don't see both the /host and
/target generated: make invokes one of them and expects the recipe to build
both, so later when the other is listed as a prerequisite make thinks it's
already been built.

You have to write your pattern rules like this then it should work as you

        @echo $@
        @echo $@

If I've misunderstood the situation add a comment with more detail (maybe a
simpler test-case) and I'll re-open this bug.


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