Planner & building with --as-needed

Patryk Zawadzki wrote in http://bugzilla.gnome.org/show_bug.cgi?id=528582:
> I am not sure if you are familiar with gcc4's --as-needed switch. Sorry if you
> know all this:
> 
> --as-needed causes the linker to check each linked library for symbols used in
> the object files. If there are none then the library is dropped and the
> resulting binary does not link to it. This is very useful as most projects
> specify only one set of libraries for all the binaries they produce. This
> results in uneeded dependencies in some of them.
> 
> On the other hand when a project forgets to specify all the direct dependencies
> it can happen that without --as-needed one of the linked libraries accidentally
> pulls all the missing deps and linking works fine (in your case some other
> library pulls the libm dependency while it should not). After recompiling the
> library with --as-needed the libm dependency will go away and planner fails to
> link with unresolved symbols.
> 
> In any case if a project uses symbols from a particular library it should
> explicitly link against it, not depending on some other library pulling the
> necessary dependencies and this is what the above patch does.

Yes, I know, but I was expecting my build to fail as well when using
--as-needed. However, I tried your command line and it worked fine.

I noticed that for some reason -lm is added anyway, but I've been
unable to locate any library that caused it. And even if there is such a
library, why would this not happen on your system?

Maurice.

-- 
Maurice van der Pot

Gentoo Linux Developer   [email protected]    http://www.gentoo.org
Gnome Planner Developer  griffon26-bCGDfOjggl9Wk0Htik3J/[email protected]  http://live.gnome.org/Planner

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