[Bug gold/17670] internal error in symval_for_branch, at powerpc.cc:6755 during qt5 build

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https://sourceware.org/bugzilla/show_bug.cgi?id=17670

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https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=feba93770920f91760d6390541221b75ba5c95f3

commit feba93770920f91760d6390541221b75ba5c95f3
Author: Alan Modra <address@hidden>
Date:   Wed Dec 3 16:17:23 2014 +1030

    powerpc gold, work around pr17670

    pr17670 is about an assert triggering on a branch to an undefined
    weak symbol, the symbol being undefined due to dropping its comdat
    group section.  (Well sort of.  The symbol is actually defined in
    an .opd section which isn't part of the group, but the code section
    the opd entry points at is dropped.)  So don't assert.
    Also, don't make long branch stubs to such symbols, and arrange to
    have target-reloc.h code warn when applying relocs that use the sym.

        PR 17670
        * symtab.cc (Symbol::set_undefined): Remove assertion.
        * powerpc.cc (Target_powerpc::symval_for_branch): Don't assert
        on symbols defined in discarded sections, instead return false.
        Rearrange params, update all callers.
        (Target_powerpc::Branch_info::make_stub): Don't make stubs for
        branches to syms in discarded sections.
        (Global_symbol_visitor_opd::operator()): Set discarded opd syms
        undefined and flag as discarded.
        (Target_powerpc::Relocate::relocate): Localize variable.

-----------------------------------------------------------------------

Summary of changes:
 gold/ChangeLog  |   13 +++++++++++++
 gold/powerpc.cc |   54 +++++++++++++++++++++++++++++++-----------------------
 gold/symtab.cc  |    1 -
 3 files changed, 44 insertions(+), 24 deletions(-)

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