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Re: LTO and asm specs...
On Tue, Mar 16, 2010 at 12:28 PM, David Miller <davem@davemloft.net> wrote:
> From: Richard Henderson <rth@redhat.com>
> Date: Tue, 16 Mar 2010 11:31:44 -0700
>
>> On 03/12/2010 09:33 PM, David Miller wrote:
>>> I couldn't figure out immediately how to fix this as the
>>> way LTO does spec overriding and such looked non-trivial.
>>
>> It would not be a bad thing, IMO, if the sparc assembler
>> were extended to be able to emit any reloc directly, without
>> needing a specific command-line option. ?Then you'd only
>> encounter this problem with legacy assemblers.
>
> It's not the assemblers fault.
>
> We're using %hi() and expecting the assembler to emit a
> PC relative relcation just because the symbol name happens
> to be _GLOBAL_OFFSET_TABLE_ ?And it will do this, but only
> when -PIC. ?Changing that is pretty dangerous.
>
> But even if we got past that, we need to get the assembler options
> right in order to enable instruction classes. ?For example we have to
> get -Av9a there when using VIS instructions.
>
> Other platforms are going to hit things like this too.
>
> LTO really needs to evaluate the specs correctly.
>
Can you store assembler options in some LTO section?
--
H.J.