[Bug gcov-profile/51361] New: [4.7 Regression] 471.omnetpp of SPEC2006 fails to build with -fprofile-generate

[venkataramanan.kumar.gnu at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51361

             Bug #: 51361
           Summary: [4.7 Regression] 471.omnetpp of SPEC2006 fails to
                    build with -fprofile-generate
    Classification: Unclassified
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: major
          Priority: P3
         Component: gcov-profile
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: venkataramanan.kumar.gnu@gmail.com


When we build SPEC2006 benchmark omnetpp with  -fprofile-generate, it fails
with lot of undefined references to instrumented sysmbols.

(Snip)
 1322659317.41: EtherAppSrv.o:(.data+0x2a0): undefined reference to
`__gcov___ZNK7cModule13numInitStagesEv'
1322659317.41: EtherAppSrv.o:(.data+0x2a4): undefined reference to
`__gcov___ZN7cModule10initializeEi'
1322659317.41: EtherApp_m.o:(.data+0xdcc): undefined reference to
`__gcov___ZNK12EtherAppResp3dupEv'
1322659317.41: EtherApp_m.o:(.data+0xdd0): undefined reference to
`__gcov___ZNK11EtherAppReq3dupEv'
1322659317.41: EtherBus.o:(.data+0x260): undefined reference to
`__gcov___ZNK7cModule13numInitStagesEv'
1322659317.41: EtherBus.o:(.data+0x264): undefined reference to
`__gcov___ZN7cModule10initializeEi'
1322659317.41: EtherBus.o:(.data+0x26c): undefined reference to
`__gcov___ZNK8cMessage3dupEv'
(Snip ends) 

I am trying to make a reduced test case.

The build error started in revision 181105

Also reproduced in revison 181838