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From: "amodra at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug other/49665] 'defined in discarded section' link failures on cpu2006 benchmarks
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49665

Alan Modra <amodra at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |NEW
         AssignedTo|amodra at gmail dot com     |unassigned at gcc dot
                   |                            |gnu.org

--- Comment #2 from Alan Modra <amodra at gmail dot com> 2011-07-07 09:50:54 UTC ---
So, looks like a gcc bug after all.  There are four files with a certain group
example.s:    .section   
.text._ZN6soplex8SPxBasisD2Ev,"axG",@progbits,_ZN6soplex8SPxBasisD5Ev,comdat
example.s:    .section   
.text._ZN6soplex8SPxBasisD0Ev,"axG",@progbits,_ZN6soplex8SPxBasisD5Ev,comdat
soplex.s:    .section   
.text._ZN6soplex8SPxBasisD2Ev,"axG",@progbits,_ZN6soplex8SPxBasisD5Ev,comdat
soplex.s:    .section   
.text._ZN6soplex8SPxBasisD0Ev,"axG",@progbits,_ZN6soplex8SPxBasisD5Ev,comdat
spxbasis.s:    .section   
.text._ZN6soplex8SPxBasisD2Ev,"axG",@progbits,_ZN6soplex8SPxBasisD5Ev,comdat
spxbasis.s:    .section   
.text._ZN6soplex8SPxBasisD0Ev,"axG",@progbits,_ZN6soplex8SPxBasisD5Ev,comdat
spxsolver.s:    .section   
.text._ZN6soplex8SPxBasisD2Ev,"axG",@progbits,_ZN6soplex8SPxBasisD5Ev,comdat
spxsolver.s:    .section   
.text._ZN6soplex8SPxBasisD0Ev,"axG",@progbits,_ZN6soplex8SPxBasisD5Ev,comdat

In each of these files this group contains two sections, with the code for
_ZN6soplex8SPxBasisD0Ev and _ZN6soplex8SPxBasisD2Ev in them.  In just one file,
spsbasis.o, there is an alias for _ZN6soplex8SPxBasisD2Ev.

    .weak    _ZN6soplex8SPxBasisD1Ev
    .set    _ZN6soplex8SPxBasisD1Ev,_ZN6soplex8SPxBasisD2Ev

When the group in spsbasis.o is dropped, _ZN6soplex8SPxBasisD1Ev has no proper
definition.