On Wed, Feb 8, 2012 at 7:26 PM, Stephen D. Fox <stfo...@gmail.com> wrote:
> In makefiles on Ubuntu & Debian machines, previously you could set
>
> CPPFLAGS=$(some paths)
> LDFLAGS=$(some libraries)
>
> and
>
> "make main"
>
> would compile by default using something like this command:
>
> g++ $(CPPFLAGS) $(LDFLAGS) main.cpp -o main
>
> Now it gives linking errors because it seems g++-4.6 has changed (maybe
> what was previously a bug?). Is it now compulsory for linking flags to
> come after the
> sources to which they apply?
That would be a question to ask on the gcc/g++ mailing lists.
> I've tested with g++-4.4 and make 3.81-8 on ubuntu, and the above works,
> but it
> doesn't work with g++-4.6. Is there a different variable I could set
> other than LDFLAGS
> for a generic makefile like that?
Yes, there's a different variable for that. In fact, there are two:
$ make -f /dev/null -pq | grep -A2 '^%: %.cc'
make: *** No targets. Stop.
%: %.cc
# recipe to execute (built-in):
$(LINK.cc) $^ $(LOADLIBES) $(LDLIBS) -o $@
$
I would recommend using LDLIBS.
Philip Guenther
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