[Bug bootstrap/46981] New: multilib LD_LIBRARY_PATH prevents configuration of target libraries

[dje at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46981

           Summary: multilib LD_LIBRARY_PATH prevents configuration of
                    target libraries
           Product: gcc
           Version: 4.6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: bootstrap
        AssignedTo: unassig...@gcc.gnu.org
        ReportedBy: d...@gcc.gnu.org


config-ml.in adjusts LD_LIBRARY_PATH for multilib target libraries.  This
apparently was introduced to ensure that applications created by configure in
multilib directories find the correct libraries:

http://gcc.gnu.org/ml/gcc-patches/2000-08/msg00666.html

However, GCC cc1 now relies on libstdc++ via libppl and LD_LIBRARY_PATH will
specify the 64 bit directory for the 64 bit multilib of a target library:

/tmp/201012005/powerpc-ibm-aix5.3.0.0/ppc64/libstdc++-v3/src/.libs

If libstdc++-v3 is configured and built before libgfortran, for example, 64 bit
libgfortran configure will fail because 32 bit cc1 finds the wrong version of
libstdc++-v3.  LD_LIBRARY_PATH is affecting the host path, not only the target
path.

I am not sure why this started to fail on AIX now (timing issue?), but it
causes a bootstrap failure of target libraries.