[Bug binutils/19446] BFD linker discards section without alloc section attribute under certain conditions

[xinliangli at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=19446

--- Comment #4 from David Li <xinliangli at gmail dot com> ---
(In reply to H.J. Lu from comment #3)
> (In reply to David Li from comment #2)
> > (In reply to H.J. Lu from comment #1)
> > > Since UNREF section is not referenced, it should be GCed.  Am I missing
> > > something?
> > 
> > Note that the section does not have 'a' bit -- just like debug sections.
> > Linker won't GC debug sections, right?
> 
> ld only treats known debug sections as debug sections.  Are you looking
> for a way to prevent unreferenced section from GC?

yes.


> 
> > Also there is inconsistent behavior here -- when g0 is not referenced by
> > UNREF, UNREF will be kept by the linker.
> 
> g0 is removed by ld in binutils 2.26.

No -- that is not the point. The point is that if UNDEF section is defined as
follows,  ld *will* keep UNREF (I have not tried 2.26). What makes ld think
UNREF should be kept here as they are not known debug sections?



        .globl  unref
        .section        UNREF,"",@progbits
        .align 8
        .type   unref, @object
        .size   unref, 8
unref:
        .long 0

        .text
        .globl  main
        .type   main, @function

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