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@theller:
I have tried --with-pydebug, but it gives the same errors.
Please find logfile attached.

@nnorwitz:
I remove the Python-2.5b2 directory and execute a fresh
untar, configure etc. for each try. So there is no
interference with results from different compilers.

In case it matters, I checked for the GCC version used. I
think it came with the Solaris distribution and does use the
system-ld, not gnu-ld (see below for config output):

$ gcc -v 
Reading specs from
/usr/sfw/lib/gcc/sparc-sun-solaris2.10/3.4.3/specs
Configured with:
/gates/sfw10/builds/sfw10-gate/usr/src/cmd/gcc/gcc-3.4.3/configure
--prefix=/usr/sfw --with-as=/usr/sfw/bin/gas --with-gnu-as
--with-ld=/usr/ccs/bin/ld --without-gnu-ld
--enable-languages=c,c++ --enable-shared
Thread model: posix
gcc version 3.4.3 (csl-sol210-3_4-branch+sol_rpath)

This is from package 

$ pkginfo -l SUNWgcc
   PKGINST:  SUNWgcc
      NAME:  gcc - The GNU C compiler
  CATEGORY:  system
      ARCH:  sparc
   VERSION:  11.10.0,REV=2005.01.08.05.16
   BASEDIR:  /
    VENDOR:  Sun Microsystems, Inc.
      DESC:  GNU C - The GNU C compiler 3.4.3
    PSTAMP:  sfw1020050108051924
  INSTDATE:  Mar 20 2006 14:30
   HOTLINE:  Please contact your local service provider
    STATUS:  completely installed
     FILES:      296 installed pathnames
                   6 shared pathnames
                   5 linked files
                  25 directories
                  33 executables
              104325 blocks used (approx)

Regards,

Guido