http://sourceware.org/bugzilla/show_bug.cgi?id=15478
--- Comment #9 from Cary Coutant <ccoutant at google dot com> 2013-05-20
16:46:00 UTC ---
> Here is the documentation from older binutils which talks about --as-needed
> interpreting undefined symbols both .o and .so files:
>
> --as-needed
> --no-as-needed
> This option affects ELF DT_NEEDED tags for
> dynamic libraries mentioned on the command line
> after the --as-needed option. Normally the
> linker will add a DT_NEEDED tag for each dynamic
> library mentioned on the command line,
> regardless of whether the library is actually
> needed or not. --as-needed causes a DT_NEEDED
> tag to only be emitted for a library that
> satisfies an undefined symbol reference from a
> regular object file or, if the library is not
> found in the DT_NEEDED lists of other libraries
> linked up to that point, an undefined symbol
> reference from another dynamic library.
> --no-as-needed restores the default behaviour.
That is rather explicit, isn't it? For gold to match this behavior, I
think all we need to do is remove the test for sym->in_reg() in the
following code in Symbol_table::set_dynsym_indexes:
// If the symbol is defined in a dynamic object and is
// referenced strongly in a regular object, then mark the
// dynamic object as needed. This is used to implement
// --as-needed.
if (sym->is_from_dynobj()
&& sym->in_reg()
&& !sym->is_undef_binding_weak())
sym->object()->set_is_needed();
Ian, what do you think?
-cary
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