If gcc and suncc are present, ./configure chooses gcc and everything is
fine.

If only suncc is present, it's detected as cc. These tests should be
possible:

stefan@opensolaris:~/svn/py3k$ cc -V
cc: Sun C 5.9 SunOS_i386 Patch 124868-07 2008/10/07
usage: cc [ options] files.  Use 'cc -flags' for details
stefan@opensolaris:~/svn/py3k$ if cc -V 2>&1 | grep -q 'SunOS_i386';
then echo yes; fi
yes
stefan@opensolaris:~/svn/py3k$ uname -a
SunOS opensolaris 5.11 snv_101b i86pc i386 i86pc Solaris
stefan@opensolaris:~/svn/py3k$ if uname -a | grep -q i386; then echo yes; fi
yes