Philip Guenther-2 wrote:
>
> On Sun, Jun 3, 2012 at 8:46 PM, normvcr <[email protected]> wrote:
>> Philip Guenther-2 wrote:
> ...
>>> I believe the most common cause of this is because some makefile rule
>>> builds a file other than $@. In this case, ../src/foo.cpp didn't
>>> exist before the first run but did afterwards, but make didn't know
>>> that some rule that it had run had created it. What was the rule that
>>> generated ../src/foo.cpp?
>>
>> There is, indeed, a target that first creates foo.cpp, but it only
>> overwrites an an old, existing, foo.cpp . It is as though the creation
>> of
>> the new foo.cpp is changing the rules, as you suggested, above, even
>> though there was already a foo.cpp before invoking make the first time.
>>
>> Any ideas how to work around, that? Perhaps, if I break up the
>> rule into two rules (first make foo.cpp, then make foo.o),
>> that should simplify things for make, but should such a work-around
>> be necessary?
>
> No, make does not need that. The problem is almost certainly that THE
> RULE IS WRONG. Every rule should create/update *exactly* the path
> "$@". Not "../src/$@" or "${objdir}/$@", but *just* $@. Is that what
> the current rule does? Since you don't want to show the rule itself,
> you'll have to look and answer that yourself.
>
I think you have hit the nail on the head. I checked and, indeed,
$@ is foo.cpp, but I want to build $(srcdir)/foo.cpp . The rule has been
%.cpp: %.h
Do stuff which results in $(srcdir)/foo.cpp
So, I tried
$(srcdir)/%.cpp: %h
Do same kind of stuff
but it did not match on this rule.
As you can surmise, I am generating the .cpp file from the .h file,
and I also keep my object code in a different folder than the source
code, so that is why I am running make not in the source directory,
but in the object directory.
Can you suggest how to construct a rule that would match?
Thank you for your input. I have not put in the actual rule since it
involves commands with many arguments that would only clutter
the issue. I hope you are not offended by this.
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