[Bug bootstrap/59580] New: --with-arch=generic is allowed to configure GCC

[hjl.tools at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59580

            Bug ID: 59580
           Summary: --with-arch=generic is allowed to configure GCC
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: bootstrap
          Assignee: unassigned at gcc dot gnu.org
          Reporter: hjl.tools at gmail dot com
                CC: ubizjak at gmail dot com
            Target: x86-64, x86

When GCC is configured with

/export/gnu/import/git/gcc/configure --enable-clocale=gnu --with-system-zlib
--with-demangler-in-ld  --enable-shared i686-linux --prefix=/usr/gcc-4.9.0
--with-local-prefix=/usr/local --with-arch=generic --with-fpmath=sse

bootstrap fails with

/i686-linux/include -isystem /usr/gcc-4.9.0/i686-linux/sys-include   
checking for suffix of object files... configure: error: in
`/export/build/gnu/gcc-test-32bit/build-i686-linux/i686-linux/libgcc':
configure: error: cannot compute suffix of object files: cannot compile
See `config.log' for more details.

configure:3602: /export/build/gnu/gcc-test-32bit/build-i686-linux/./gcc/xgcc
-B/export/build/gnu/gcc-test-32bit/build-i686-linux/./gcc/
-B/usr/gcc-4.9.0/i686-linux/bin/ -B/usr/gcc-4.9.0/i686-linux/lib/ -isystem
/usr/gcc-4.9.0/i686-linux/include -isystem
/usr/gcc-4.9.0/i686-linux/sys-include    -c -g -O2  conftest.c
>&5conftest.c:1:0: error: generic CPU can be used only for -mtune= switch