Toplevel configury, multilibs, new autoconf versions

[Phil Edwards]

On Sat, Jul 26, 2003 at 01:16:10AM -0400, Nathanael Nerode wrote:
> >The build is using the value of CXX passed around in the environment.
> >For libstdc++, it's a special case from the toplevel:
> >
> >    libstdcxx_flags='`test ! -f 
> >$$r/$(TARGET_SUBDIR)/libstdc++-v3/scripts/testsuite_flags || $(SHELL) 
> >$$r/$(TARGET_SUBDIR)/libstdc++-v3/scripts/testsuite_flags 
> >--build-includes` -L$$r/$(TARGET_SUBDIR)/libstdc++-v3/src 
> >-L$$r/$(TARGET_SUBDIR)/libstdc++-v3/src/.libs'
> >    raw_libstdcxx_flags=' -L$$r/$(TARGET_SUBDIR)/libstdc++-v3/src 
> >-L$$r/$(TARGET_SUBDIR)/libstdc++-v3/src/.libs'
> >
> >Note the -L options; these get embedded into CXX_FOR_TARGET a few lines
> >later, which becomes CXX inside the library.
> 
> So the testsuite_flags stuff isn't the problem?  That was the part I've 
> been afraid to tweak.  :-)

It's not the problem /now/.  --build-includes emits a bunch of -I's.
It's the -L's that are the problem, and those are embedded in the toplevel
configure.in.


> I think 'preinstall' is the correct solution for this.  libstdc++ should 
> be changed to preinstall the libraries into preinstall-${target}/lib.
> 
> Then after multilibbing is moved to the top level, the 
> non-multilib version would always have preinstall-${target}/lib added
> to the LD_LIBRARY_PATH passed down from the top.  For the multilibbed 
> targets, each one would have a different, appropriate 
> preinstall-${target}/xx/lib added to LD_LIBRARY_PATH.

And LD_RUN_PATH too, I hope.


> OK, so this is pie-in-the-sky.  But maybe you can find a way to adapt 
> this idea to the current state of things?

Not at the present time.  I've got too many local changes already to try
and do preinstalling.  (FWIW, both Benjamin and I -- and maybe others too,
I simply don't know -- agree that a staging area for installation is needed.)

Also, I'm having trouble understanding how this manages to work at present,
i.e., with the "old" autotools.  The -L options are still hardcoded
either way.


Phil

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