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Re: Issue with LTO/-fwhole-program
On 11 June 2010 21:41, Manuel López-Ibáñez <lopezibanez@gmail.com> wrote:
> On 11 June 2010 20:48, Cary Coutant <ccoutant@google.com> wrote:
>>> But if I understand correctly, mixed LTO/non-LTO + whole-program is
>>> almost never correct. So we should really emit a warning for this
>>> specific combination. I think making this mistake would be quite easy
>>> but hard to debug.
>>
>> The plugin interface was designed to provide this essential
>> information to the compiler about all the non-LTO code; until Gnu ld
>> implements this or the collect2 interface provides something similar,
>> you're simply working with an incomplete implementation, and you'll
>> have to live with the limitations.
Personally, I rather have GCC warn every time that using LTO (or any
other option) may lead to miscompilation than find out later that my
program is behaving strange. A warning is a limitation I can live
with. Wrong results from perfectly valid programs, not so nice.
Manuel.