Re: discarding rules for duplicate ELF comdat groups

["Jan Beulich" <JBeulich at novell dot com>]

>>> On 28.01.11 at 15:07, "H.J. Lu" <hjl.tools@gmail.com> wrote:
> On Fri, Jan 28, 2011 at 5:51 AM, Jan Beulich <JBeulich@novell.com> wrote:
>> It seems like currently the rule simply is to pick the first instance the
>> linker gets to see. Wouldn't it make sense to honor the group
>> signature's attributed (namely its binding), and prefer keeping an
>> instance with a global group signature over a weak or local one?
>> That would allow the programmer some control over which
>> instance to keep: My main motivation is to find a way to discard
>> the various weak fallback functions Linux has to cover cases where
>> e.g. some architectures implement certain functionality, while
>> others that don't can all use a generic implementation.
>>
>> I cannot see other mechanisms that would allow ld to discard
>> sections (not to speak of individual functions within sections).
>>
> 
> Microsoft linker has some user controls over which comdat group
> instance to keep.  Will its scheme work for you?

I'm not aware of any such controls - can you point me to
something describing this?

Thanks, Jan