[Bug uprobes/12851] Wrong section group usage in <sys/sdt.h>

["hjl.tools at gmail dot com" <sourceware-bugzilla at sourceware dot org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=12851

--- Comment #6 from H.J. Lu <hjl.tools at gmail dot com> 2011-06-08 15:43:19 UTC ---
(In reply to comment #5)
> (In reply to comment #4)
> > No. Linker is correct.  YOU CAN'T HAVE LOCAL REFERENCES OUTSIDE OF
> > A COMDAT GROUP.
> 
> I assume you are referring to gabi:
> 
> "To facilitate removing a group without leaving dangling references and with
> only minimal processing of the symbol table, the following rules must be
> followed:
> 
>     A symbol table entry with STB_GLOBAL or STB_WEAK binding that is defined
                                ^^^^^^^^^^^^^^^^^^^^^^^

You missed the key part.

> relative to one of a group's sections, and that is contained in a symbol table
> section that is not part of the group, must be converted to an undefined symbol
> (its section index must be changed to SHN_UNDEF) if the group members are
> discarded. References to this symbol table entry from outside the group are
> allowed."
> 
> 
> > Non comdat member section, .note.stapsdt, has a local
> > reference of _.stapsdt.base, which is defined in a comdat
> > section. Did you mean to put .note.stapsdt section in the same
> > comdat group as .stapsdt.base section?
> 
> No. It is deliberately in its own COMDAT group to make sure there is only one
> .stapsdt.base section in the final object.
> 

Then don't make symbol defined in .stapsdt.base section referenced from
other files local.

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