hello.c:1: error: bad value (corei7) for -march= switch

although, gcc451 --help=target -march=corei7 is successful.

gcc 4.4.4-10.fc13 (fedora 13 distribution) fails as well.

gcc451 -march=generic produces .s code with -march=core2

configured with:
../gcc-4.5.1/configure --prefix=/usr/local --program-suffix=451
--enable-threads \

           Summary: gcc 4.5.1 -march=corei7 fails
           Product: gcc
           Version: 4.5.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: dcy665 at gmail dot com


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