Re: Spec strings to pass ‘-rpath’ for each ‘-L’

[Marc Glisse <marc dot glisse at inria dot fr>]

On Fri, 14 Sep 2012, Ludovic CourtÃs wrote:

> Marc Glisse <marc.glisse@inria.fr> skribis:
>
> > On Thu, 13 Sep 2012, Ludovic CourtÃs wrote:
> >
> > > Hi,
> > >
> > > The page at <http://gcc.gnu.org/faq.html>, under âDynamic linker is
> > > unable to find GCC librariesâ reads:
> > >
> > >  The short explanation is that if you always pass a -R option to the
> > >  linker, your programs become dependent on directories which may be NFS
> > >  mounted [...]
> > >
> > >  However, if you feel you really need such an option to be passed
> > >  automatically to the linker, you may add it to a GCC specs file. [...]
> > >  You may add linker flags such as -R or -rpath, depending on platform
> > >  and linker, to the *link or *lib specs.
> > >
> > > After spending some time looking at spec strings and at the manual, I
> > > canât think of a way of emitting â-rpath LIBDIRâ for every â-LLIBDIRâ
> > > encountered.
> >
> > %{L*:-rpath %*} maybe?
>
> I realize this isnât sufficient for my purposes: when $LIBRARY_PATH is
> used, -L can be omitted, thus bypassing the above trick.
>
> Ideally, for every â-lLIBâ, it would add â-rpath $(dirname $(which
> LIB))â, so to speak.  That may be beyond what spec strings can express,
> though.  Or maybe not? :-)

If you bypass the compiler to talk to the linker (LD_* environment 
variables, -Wl,* flags), only the linker can help you.

--
Marc Glisse