[Bug libc/6441] New: Value of slibdir changes after reconfigure for 64-bit targets

["anemet at caviumnetworks dot com" <sourceware-bugzilla at sourceware dot org>]

After reconfiguring, the value of slibdir changes from ${exec_prefix}/lib32 or
${exec_prefix}/lib64 to ${exec_prefix}/lib.

This is because the code that sets libdir is only executed if libc_cv_slibdir
is unset (this is to provide an override mechanism for subtargets).  If the
value of libc_cv_slibdir is read from the config cache the value of libdir is
never adjusted.  Or:

  $ rm config.cache 
  $ ~/src/glibc/configure --host=mips64-unknown-linux-gnu --build=i686-linux
--prefix=/usr --cache-file=config.cache &>/dev/null
  $ grep libdir config.make 
  libdir = ${exec_prefix}/lib32
  slibdir = /lib32
  $ ~/src/glibc/configure --host=mips64-unknown-linux-gnu --build=i686-linux
--prefix=/usr --cache-file=config.cache &>/dev/null
  $ grep libdir config.make 
  libdir = ${exec_prefix}/lib
  slibdir = /lib32

With the current logic, either both libdir and slibdir should be cached or
neither.

-- 
           Summary: Value of slibdir changes after reconfigure for 64-bit
                    targets
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
        AssignedTo: drepper at redhat dot com
        ReportedBy: anemet at caviumnetworks dot com
                CC: glibc-bugs at sources dot redhat dot com
 GCC build triplet: i686-linux
  GCC host triplet: mips64-unknown-linux-gnu


http://sourceware.org/bugzilla/show_bug.cgi?id=6441

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