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Re: AVR gives weird error with LTO
On Thu, Dec 31, 2009 at 12:04 AM, Andrew Hutchinson
<andrewhutchinson@cox.net> wrote:
>
> Dave Korn wrote:
>>
>> Rafael Espindola wrote:
>>
>>>>
>>>> ?It's not a valid option for ld. ?It *is* a valid option for the
>>>> collect2
>>>> driver/wrapper executable that gcc uses to invoke ld, which suggests to
>>>> me
>>>> that the AVR port must be configured not to build collect2, but that it
>>>> is
>>>> going to need to do so if it wants to use LTO/WHOPR. ?See use_collect2
>>>> in
>>>> gcc/config.gcc
>>>>
>>>
>>> Or you could port gold to AVR and use the plugin :-)
>>>
>>
>> ?I hadn't checked, but yeah, since AVR is an ELF platform, that's a nice
>> solution too. ?There might still be reason to build a collect2, for
>> interop
>> with older binutils.
>>
>> ? ?cheers,
>> ? ? ?DaveK
>>
>>
>>
>
> Thank you David and Rafel
>
> I will dig further into collect2. ?I had noted that avr.h has the following:
>
>
> /* This is undefined macro for collect2 disabling */
> #define LINKER_NAME "ld"
That's indeed going to break LTO.
Richard.
> Also, the MINGW host is the most significant for the AVR target - and
> problems with collect2 may be related to maintaining compatibility to that.
>
> Andy
>
>