Re: Toplevel configury, multilibs, new autoconf versions

[neroden at twcny dot rr dot com (Nathanael Nerode)]

>The next step in converting to the new autotools is making multilibs 
>work.

I tend to think the 'correct' way to do things is to move multilibbing 
to the top level.  ;-)  But that might be too much work to do *before* 
the autoconf upgrade.

>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.  :-)

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.

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?

-- 
Nathanael Nerode  <neroden at gcc.gnu.org>
http://home.twcny.rr.com/nerode/neroden/fdl.html