Problem with Solaris 10 / SPARC

[Amos]

I read on some blog that "sparc64" was needed to be specified, and so tried:

  ../../orig/configure --build=sparc64-sun-solaris2.10 ...

(our build environment has some pretty deep directory paths involved so we
can compile for multiple systems, and it's a really old technique we use.)

also specified:

    ABI=64
    CPPFLAGS="-m64"
    CC="/usr/soft/home/gcc/bin/gcc.pl $CPPFLAGS"
    CXX="/usr/soft/home/gcc/bin/g++.pl $CPPFLAGS"
    CFLAGS=$CPPFLAGS
    CCFLAGS=$CPPFLAGS
    CXXFLAGS=$CPPFLAGS
    export ABI CPPFLAGS CFLAGS CCFLAGS CXXFLAGS CC CXX

(the *.pl commands referenced above are simply wrappers that replace any
"-m32" with "-m64", just to be sure!)

and yet it still blows up because some part insists on compiling with
"-m32".  Why??!!!

checking for sparc64-sun-solaris2.10-gcc...
/usr/soft/that/gcc-4.8.1/src/default/sparc_sun_solaris2.10/./gcc/xgcc
-B/usr/soft/that/gcc-4.8.1/src/default/sparc_sun_solaris2.10/./gcc/
-B/usr/local/sparc64-sun-solaris2.10/bin/
-B/usr/local/sparc64-sun-solaris2.10/lib/ -isystem
/usr/local/sparc64-sun-solaris2.10/include -isystem
/usr/local/sparc64-sun-solaris2.10/sys-include  -m32
checking for suffix of object files... configure: error: in
`/usr/soft/that/gcc-4.8.1/src/default/sparc_sun_solaris2.10/sparc64-sun-solaris2.10/sparcv8plus/libgcc':
configure: error: cannot compute suffix of object files: cannot compile
See `config.log' for more details.
gmake[2]: *** [configure-stage1-target-libgcc] Error 1
gmake[2]: Leaving directory
`/usr/soft/that/gcc-4.8.1/src/default/sparc_sun_solaris2.10'
gmake[1]: *** [stage1-bubble] Error 2
gmake[1]: Leaving directory
`/usr/soft/that/gcc-4.8.1/src/default/sparc_sun_solaris2.10'
gmake: *** [bootstrap-lean] Error 2

and this is why the configure blows-up:
./sparc64-sun-solaris2.10/sparcv8plus/libgcc/config.log:

configure:3565: checking for suffix of object files
configure:3587:
/usr/soft/that/gcc-4.8.1/src/default/sparc_sun_solaris2.10/./gcc/xgcc
-B/usr/soft/that/gcc-4.8.1/src/default/sparc_sun_solaris2.10/./gcc/
-B/usr/local/sparc64-sun-solaris2.10/bin/
-B/usr/local/sparc64-sun-solaris2.10/lib/ -isystem
/usr/local/sparc64-sun-solaris2.10/include -isystem
/usr/local/sparc64-sun-solaris2.10/sys-include  -m32 -c -g -O2 -m64
conftest.c >&5
xgcc: error: may not use both -m32 and -m64

I'm getting the impression that the actual source probably supports
64-bit compile, but it's all the configure stuff that's getting in the way.

Amos