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Re: Avoid relinking when .so file changes

From: variablecloudiness
Subject: Re: Avoid relinking when .so file changes
Date: 1 Jul 2006 12:06:29 -0700
User-agent: G2/0.2

Henrik Carlqvist wrote:
> wrote:
> > I don't, however, want 'myBinary' relinked, since the interface to
> > the .so file hasn't changed--relinking is unnecessary.
> But you want the .so file created if it doesn't already exist I suppose?


> One way to fix this would be:
> myBinary: myBinary.o $(filter-out $(wildcard,
>         g++ --go-go-gadget-linker
> With the above rule myBinary depends on if it doesn't
> already exist. But if the file already exist it doesn't care if it is
> newer than myBinary.

Perfect!  Thanks!  I don't claim to understand how that works, but it
does work.

> > How do I change this Makefile to keep the relinking from happening?
> > Dropping the .so dependency creates pain, because then 'make -j' doesn't
> > work right.
> What is the problem with make -j? To me it seems as if dropping the
> dependency only would cause the .so file not to be created, regardless of
> if the -j flag is used.

The problem with dropping the dependency was that if I do a 'make
clean' then a 'make -j 4 all' (all is a target that depends on all the
.so files and all of the binaries), the binary may be linked before the
.so file is created, which is an error.


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